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2. The number of Simply-connected Trivalent $2$-dimensional Stratifolds

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57M20, 57M05, 57M15
Abstract

We describe a method for counting the number of $1$-connected trivalent $2$-stratifolds with a given number of singular curves and $2$-manifold components.

Published
2020

3. $2$-stratifolds with fundamental group $\mathbb{Z}$

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57N10, 57M20, 57M05
Abstract

$2$-stratifolds are a generalization of $2$-manifolds that occur as objects in applications such as in TDA. These spaces can be described by an associated bicoloured labelled graph. In previous papers we obtained a classification of 1-connected trivalent $2$-stratifolds. In this paper we classify trivalent $2$-stratifolds that have fundamental group $\mathbb{Z}$. This classification implicitly gives an efficient algorithm that applies to a bicoloured labelled graph to decide wether the associated $2$-stratifold has fundamental group $\mathbb{Z}$.

Published
2018

4. Models of Simply-connected Trivalent $2$-dimensional Stratifolds with an Implementation Code

Author

Gómez-Larrañaga, J. C., González-Acuña, F., Heil, Wolfgang, and Hernández-Esparza, Y. A.

Subjects
Mathematics - Geometric Topology, 57M20, 57M05, 57M15
Abstract

Trivalent $2$-stratifolds are a generalization of $2$-manifolds in that there are disjoint simple closed curves where three sheets meet. We develop operations on their associated labeled graphs that will effectively construct from a single vertex all graphs that represent $1$-connected $2$-stratifolds. We describe an implementation on Python of these operations and other previous results., Comment: arXiv admin note: substantial text overlap with arXiv:1611.08013

Published
2018

6. 2-stratifold spines of closed 3-manifolds

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57N10, 57M20, 57M05
Abstract

$2$-stratifolds are a generalization of $2$-manifolds in that there are disjoint simple closed branch curves. We obtain a list of all closed $3$-manifolds that have a $2$-stratifold as a spine.

Published
2017

7. $2$-stratifold groups have solvable Word Problem

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57M05, 20F10
Abstract

$2$-stratifolds are a generalization of $2$-manifolds in that there are disjoint simple closed curves where several sheets meet. We show that the word problem for fundamental groups of $2$-stratifolds is solvable.

Published
2017

8. Classification and Models of Simply-connected Trivalent $2$-dimensional Stratifolds

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57M20, 57M05, 57M15
Abstract

Trivalent $2$-stratifolds are a generalization of $2$-manifolds in that there are disjoint simple closed curves where three sheets meet. We obtain a classification of $1$-connected $2$-stratifolds in terms of their associated labeled graphs and develop operations that will construct from a single vertex all graphs that represent $1$-connected $2$-stratifolds.

Published
2016

10. 2-dimensional stratifolds

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
Mathematics - Geometric Topology, 57M20, 57M15
Abstract

2-stratifolds are a generalization of 2-manifolds in that there are disjoint simple closed curves where several sheets meet. They arise in the study of categorical invariants of 3-manifolds and may have applications to topological data analysis. We define 2-stratifolds and study properties of their associated labeled graphs that determine which ones are simply connected.

Published
2015

13. Unsolvable problems about higher-dimensional knots and related groups

Author

Gonzalez-Acuna, F., Gordon, C. McA., and Simon, J.

Subjects
Mathematics - Group Theory, 20
Abstract

We consider classes of fundamental groups of complements of various kinds of codimension 2 embeddings and show that, in general, the problem of deciding whether or not a group in one class belongs to a smaller class is algorithmically unsolvable., Comment: 20 pages, AMSLaTeX, accepted for publication in L'Enseignement Mathematique

Published
2009

14. The double skin of the pink fairy armadillo, the peculiar integumentary system of Chlamyphorus truncatus Cingulata (Mammalia, Xenarthra).

Author

Krmpotic, C. M., Scarano, A. C., Andrés Laube, P. F., Ciancio, M. R., Loza, C. M., Acuña, F., Castro, N. N., and Barbeito, C. G.

Subjects
ARMADILLOS, MAMMALS, SENSE organs, HISTOLOGICAL techniques, CAVERNOUS sinus
Abstract

Chlamyphorus truncatus is the smallest known armadillo, weighing about 100 grams and measuring less than 15 cm from head to tail. It is endemic to central Argentina and the species is named after its unique carapace. This armadillo has almost completely subterranean habits and, unlike all other subterranean mammals, C. truncatus has a carapace composed of osteoderms and cornified scales. Furthermore, the skin and carapace show unique characteristics compared even with other armadillos. Owing to the reduced development of its eyes, it is important to analyse the skin morphology of this species, as well as specialized sensory organs like vibrissae. The aim of this contribution is to describe the histomorphology of the integumentary system of C. truncatus. For this, histological sections of the skin with and without osteoderms were made, and routine histological and immunohistochemical techniques were performed. Furthermore, microCTs were performed on osteoderms to describe their micromorphology. Our results show that the integumentary system presents unique characteristics compared to other armadillos, such as the peculiar skin under the dorsal shield and the flexibility of almost all of its carapace. Furthermore, the modification of the arrangement of hairs in the first pelvic buckler osteoderms may suggest biomechanical adaptations, such as an improvement in the displacement through the tunnels of sandy soils. The skin without osteoderms presents convergent characteristics with that of other subterranean mammals. Furthermore, the vibrissae conserve the structure of the armadillos (the cavernous sinuses extend throughout the follicle‐sinus complex) with a thinning and shortening of the hairs, which are probably linked to passive monitoring of the surrounding environment. Evidently, the adaptations of subterranean mammals to their environment imply structural and functional changes, which are both regressive and progressive in nature. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Models of simply-connected trivalent 2-dimensional stratifolds

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Abstract

Trivalent 2-stratifolds are a generalization of 2-manifolds in that there are disjoint simple closed curves where three sheets meet. We develop operations on their associated labeled graphs that will effectively construct from a single vertex all graphs that represent simply connected trivalent 2-stratifolds.

Published
2024
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23. 2-STRATIFOLD SPINES OF CLOSED 3-MANIFOLDS

Author

Gómez-Larrañaga, J. C., González-Acuña, F., and Heil, Wolfgang

Subjects
57N10, Mathematics - Geometric Topology, 57M20, 57M05, FOS: Mathematics, Geometric Topology (math.GT), Mathematics::Differential Geometry, Mathematics::Symplectic Geometry, Mathematics::Geometric Topology, 57N10, 57M20, 57M05
Abstract

$2$-stratifolds are a generalization of $2$-manifolds in that there are disjoint simple closed branch curves. We obtain a list of all closed $3$-manifolds that have a $2$-stratifold as a spine.

Published
2020

36. Stylasteridae Gray 1847

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Hydrozoa, Anthoathecata, Stylasteridae, Animalia, Biodiversity, Taxonomy
Abstract

Family Stylasteridae Gray, 1847 Material collected: BBB 2016: St. 5; St. 9; St. 11; St. 12; St. 13; St. 16; St. 18; St. 21; St. 23; St. 25; St. 28; St. 29; St. 30; St. 33; St. 34; St. 35; St. 36; St. 40. Distribution: Seventeen stylasterid species are known to inhabit usually deep waters of the Argentinian shelf and slopes. The majority of them have been also recorded in the Burdwood bank region, but also other subantarctic waters. Specific information could be obtained from Cairns (1983) and Bernal et al. (2018). Remarks: Living and dead fragments of stylasterid colonies were collected. The material was not identified until species level yet. However, preliminary results showed that many collected specimens belong to the genus Errina, Errinopsis and Sporadopora. Epibiotic organisms were frequently attached to these colonies, as also noted by Schejter et al. (2017a, 2020). Moreover, they were conspicuous habitat-forming species of the animal forests recorded in the area (Schejter et al. 2020)., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 209, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Cairns, S. D. (1983) Antarctic and subantarctic Stylasterina (Coelenterata: Hydrozoa). Biology of the Antarctic Seas XIII. Antarctic Research Series, 38, 61 - 164. https: // doi. org / 10.1029 / AR 038 p 0061","Bernal, M. C., Cairns, S. D., Penchaszadeh, P. & Lauretta, D. (2018) Errina argentina sp. nov., a new stylasterid (Hydrozoa: Stylasteridae) from Mar del Plata submarine canyon (Soutwest Atlantic). Marine Biodiversity, 49, 833 - 839. https: // doi. org / 10.1007 / s 12526 - 018 - 0861 - 1","Schejter, L., Martin, J. & Lovrich, G. (2017 a) Unveiling the submarine landscape of the Namuncura Marine Protected Area, Burdwood bank, SW Atlantic Ocean. Pan American Journal of Aquatic Sciences, 12 (3), 248 - 253.","Schejter, L., Genzano, G., Gaitan, E., Perez, C. D. & Bremec, C. S. (2020) Benthic communities in the Southwest Atlantic Ocean: Conservation value of animal forests at the Burdwood bank slope. Aquatic Conservation: Marine and Freshwater Ecosystems, 30, 426 - 439. https: // doi. org / 10.1002 / aqc. 3265"]}

Published
2020
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37. Alcyonium

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Alcyoniidae, Animalia, Biodiversity, Alcyonacea, Anthozoa, Alcyonium, Taxonomy
Abstract

Alcyonium sp. 2 Material examined: BBB 2016: St 13. Distribution: Between Tierra del Fuego and Burdwood bank, NDR (610 m). Remarks: colony bi-lobate, with polyps in conspicuous calyces and well developed anthocodial armature. Spindles from body wall resemble those on A. haddoni and A. yepayek, but A. haddoni lacks clubs in the inner layer and most clubs in A. yapayek have a central wart (Ofwegen et al. 2007). SEM analysis will allow us to cofirm if Alcyonium sp. 2 is, in fact, a new species., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 220, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Ofwegen, L. P., Haussermann, V. & Forsterra, G. (2007) The genus Alcyonium (Octocorallia: Alcyonacea: Alcyoniidae) in Chile. Zootaxa, 1607 (1), 1 - 19. https: // doi. org / 10.11646 / zootaxa. 1607.1.1"]}

Published
2020
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38. Paragorgia arborea

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Animalia, Biodiversity, Paragorgia, Alcyonacea, Paragorgiidae, Anthozoa, Paragorgia arborea, Taxonomy
Abstract

Paragorgia arborea (Linnaeus, 1758) Material examined: BBB 2016: St. 13. Distribution: Western North Atlantic, East Canada to Cape Hatteras; Boreal Eastern Atlantic, northern Mid-Atlantic Ridge; Lusitanian-Mediterranean (Watling & Auster 2005); Norway to Nova Scotia, including Faroes Islands, Iceland and Greenland, 1330 m (Tendal 1992); off Crozet Islands, Indian Ocean (46°05’– 46°24.1’S, 49°37.0’– 50°37.1’E, 140–270 m) (Grasshoff 1979; D’Ambrosio et al. 1984); Aleutian Islands (Heifetz et al. 2005); Makarov Bay, Iturup Island, Sea of Okhotsk (Nedashkovskaya et al. 2005); Southern California (52°17’– 52°22’N, 160°40’– 160°34’E, 659–798 m), New Zealand (33°55’36”S– 52°17’22”S, 159°40’00– 177°54’30”E, 659–1525 m) (Sánchez 2005); Off Patagonia and Malvinas Islands (40°57’– 54°38’S, 56°52’– 63°00’W, 340– 1000 m) (Grasshoff 1979); Burdwood bank (54°31´S, 62°11´W, 330 m) (as Paragorgia sp.) (Auscavitch & Waller 2017); Drake Passage, 57°04´S, 67°30´W, 1400 m (as Paragorgia sp.) (Waller & Robinson 2011); off Staten Island (608 m) (present study). Remarks: According to Sánchez (2005), this species has a disjunct distribution between the Arctic and Antarctic, with no linking records. Auscavitch & Waller (2017) and Waller & Robinson (2011) cited Paragorgia sp. for the Drake passage and Burdwood bank, their identification at genus level is justified since the samplings were made by towed camera surveys. Deichmann (1936) said that according to Verrill (1922) this species is common off the fishing banks off Nova Scotia and Newfoundland., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 222, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Watling, L. & Auster, P. J. (2005) Distribution of deep-water Alcyonacea off the northeast coast of the United States. In: Freiwald, A. & Roberts, J. M. (Eds.), Cold-Water Corals and Ecosystems. Springer-Verlag, Berlin, pp. 279 - 296.","Tendal, O. S. (1992) The North Atlantic distribution of the octocoral Paragorgia arborea (L., 1758) (Cnidaria, Anthozoa). Sarsia, 77, 213 - 217. https: // doi. org / 10.1080 / 00364827.1992.10413506","Grasshoff, M. (1979) Zur bipolaren Verbreitung der Oktokoralle Paragorgia arborea (Cnidaria: Anthozoa: Scleraxonia). Senckenbergiana Maritima, 11 (3 / 6), 115 - 137.","D'Ambrosio, M., Guerriero, A. & Pietra, F. (1984) Arboxeniolide- 1, a New, Naturally Occurring Xeniolide Diterpenoid from the Gorgonian Paragorgia arborea of the Crozet Is. (S. Indian Ocean). Zeitschrift fur Naturforschung C, 39 (11 - 12), 1180 - 1183. https: // doi. org / 10.1515 / znc- 1984 - 11 - 1232","Heifetz, J., Wing, B. L., Stone, R. P., Malecha, P. W. & Courtney, D. L. (2005) Corals of the Aleutian Islands. Fisheries Oceanography, 14, 131 - 138. https: // doi. org / 10.1111 / j. 1365 - 2419.2005.00371. x","Nedashkovskaya, O., Kim, S., Lysenko, A., Frolova, G., Mikhailov, V. & Bae, K. (2005) Bizionia paragorgiae gen. Nov., sp. nov., a novel member of the family Flavobacteriaceae isolated from the soft coral Paragorgia arborea. International Journal of Systematics and Evolutionary Microbiology, 55 (1), 375 - 378. https: // doi. org / 10.1099 / ijs. 0.63381 - 0","Sanchez, J. A. (2005) Systematics of the bubblegum corals (Cnidaria: Octocorallia: Paragorgiidae) with description of new species from New Zealand and the Eastern Pacific. Zootaxa, 1014 (1), 1 - 72. https: // doi. org / 10.11646 / zootaxa. 1014.1.1","Auscavitch, S. & Waller, R. (2017) Biogeographical patterns among deep sea megbenthic communities across the Drake Passage. Antarctic Science, 29 (6), 531 - 543. https: // doi. org / 10.1017 / S 0954102017000256","Deichmann, E. (1936) The Alcyonaria of the western part of the Atlantic Ocean. Memoirs of the Museum of Comparative Zoology at Harvard, 53, 1 - 317.","Verrill, A. E. (1922) Alcyonaria and Actinaria. Report of the Canadian Arctic Expeition, 8 (G), 1 - 164."]}

Published
2020
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39. Ideogorgia laurae Perez & Cordeiro 2020

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Ideogorgia, Animalia, Biodiversity, Alcyonacea, Anthozoa, Taxonomy, Keroeididae, Ideogorgia laurae
Abstract

Ideogorgia laurae Pérez & Cordeiro, 2020 Material examined: BBB 2016: St. 25 (MACN-In 42334). Remarks: The genus was thought to be endemic to shallow-waters of southern Africa (30 to 73 m), with only one species described so far, Ideogorgia capensis Williams, 1992. The present new deep record (467 m) represents the first ocurrence of the genus in subantarctic waters and suggests early connections between these two distinct ocean basins. The material examined correspond to a new species recently described and deposited in the MACN (MACN-In 42334) (Pérez & Cordeiro 2020)., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 221, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Perez, C. D. & Cordeiro, R. T. (2020) Ideogorgia laurae, an uncommon new octocoral species (Alcyonacea: Keroeididae) from a newly established Marine Protected Area at Burdwood bank, Argentina. Polar Biology, 43, 63 - 69. https: // doi. org / 10.1007 / s 00300 - 019 - 02604 - 2","Williams, G. C. (1992) The Alcyonacea of Southern Africa. Gorgonian octocorals (Coelenterata, Anthozoa). The Annals of the South African Museum, 101 (8), 181 - 296."]}

Published
2020
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40. Bougainvillia macloviana Lesson 1830

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Hydrozoa, Anthoathecata, Bougainvillia, Bougainvilliidae, Bougainvillia macloviana, Animalia, Biodiversity, Taxonomy
Abstract

Bougainvillia macloviana Lesson, 1830 Material examined: BBB 2016: St. 23. Distribution: The polyp was recorded in Kerguelen Islands and South Africa (Millard 1977); Tierra del Fuego and Malvinas / Falkland Islands, as Perigonimus repens (Ritchie 1909; Jäderholm 1910: polyp) and Perigonimus octonus (Blanco 1994: polyp); recently in San Jorge Gulf, 45°54´S – 66°45´W (López Gappa et al. 2016). This is the first record at MPA Namuncurá I. Remarks: An unfertile fragment of a colony detached from its substrata was found., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 208, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Millard, N. A. H. (1977) Hydroids from the Kerguelen and Crozet shelves, collected by the cruise MD. 03 of the Marion-Dufresne. Annals of the South African Museum, 73, 1, 1 - 47.","Ritchie, J. (1909) Supplementary report on the hydroids of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh, 47, 65 - 101.","Jaderholm, E. (1910) Ueber die Hydroiden, welche Dr. C. Skottsberg, in den jahren 1907 - 1909 gesammelt. Arkiv for Zoologi, 6, 1 - 5.","Blanco, O. (1994) Enumeracion sistematica y distribucion geografica preliminar de los Hydroides de la Republica Argentina. Suborden Athecata (Gymnoblastea, Anthomedusae), Thecata (Calyptoblastea, Leptomedusae) y Limnomedusae. Revista del Museo de La Plata, Nueva Serie, 14 (161), 181 - 216.","Lopez Gappa, J., Liuzzi, M. G. & Genzano, G. (2016) Role of the clam Neilonella sulculata as hard substrate in muddy bottoms of San Jorge Gulf (Argentina, Southwest Atlantic). Marine Biology Research, 12 (8), 888 - 893. https: // doi. org / 10.1080 / 17451000.2016.1210809"]}

Published
2020
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41. Heptaprimnoa patagonica Cairns 2012

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Heptaprimnoa patagonica, Cnidaria, Primnoidae, Heptaprimnoa, Animalia, Biodiversity, Alcyonacea, Anthozoa, Taxonomy
Abstract

Heptaprimnoa patagonica Cairns, 2012 Material examined: BBB 2016: St. 21. Distribution: Southwestern Atlantic off Argentina: continental slope off Mar del Plata, (40°00’S, 56°02’W, 520 m), continental slope off Patagonia (44.872°S, 59.635°W, 1248 m; 45.068°S, 59.501°W, 776 m; 45.605°S, 59.773°W, 1232 m); Malvinas Islands (48°54’S, 56°52’W, 780 m); Burdwood bank (54°10’S, 56°40’W, 265 m) (Cairns 2012); Burdwood bank (767 m) (present study). Remarks: One of the paratypes of this species was obtained from the Burdwood bank (54°10’S, 56°40’W, 265 m) (Cairns 2012). Cairns’s specimens are uniplanar colonies and dichotomously branched with 8–10 polyps per whorls, whereas our specimen is a liriform colony with 7–8 polyps in each whorl., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 223, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884

Published
2020
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42. Isosicyonis alba

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Actiniidae, Animalia, Isosicyonis, Biodiversity, Isosicyonis alba, Anthozoa, Actiniaria, Taxonomy
Abstract

Isosicyonis alba (Studer, 1879) Material examined: BBB 2016: St. 12; St. 13; St.17; St. 18; St. 21; St. 40 (MLP-Oi 4202). Distribution: Its distribution is known along the Argentinian shelf at more than 100 m depth (Studer 1879; Rie- mann-Zürneck 1980), South Shetland Islands (Carlgren 1949; Rodríguez & López-González 2008), Antarctic Peninsula (Fautin 1984) and Trinidad Channel (Chile) (Ridley 1882)., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 215, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Studer, T. (1879) Zweite Abtheilung der * Antozoa polyactinia *, welche wahrend der Reise S. M. S. Corvette Gazelle um die Erde gesammelt wurden. Monatsberichte der Akademie der Wissenschaften, Berlin, 1879, 524 - 550.","Carlgren, O. (1949) A survey of the Ptychodactiaria, Corallimorpharia and Actiniaria. Kungliga Svenska Vetenskapsakademiens Handlingar, 1 (1), 1 - 121.","Rodriguez, E. & Lopez-Gonzalez, P. J. (2008) The gastropod-symbiotic sea anemone genus Isosicyonis Carlgren, 1927 (Actiniaria: Actiniidae): a new species from the Weddell Sea (Antarctica) that clarifies the taxonomic position of the genus. Scientia Marina, 72 (1), 73 - 86. https: // doi. org / 10.3989 / scimar. 2008.72 n 173","Fautin, D. G. (1984) More Antarctic and Subantarctic sea anemones (Coelenterata: Corallimorpharia and Actiniaria). Biology of the Antarctic Seas XVI, Antarctic Research Series, 41, 1 - 42. https: // doi. org / 10.1002 / 9781118666579. ch 1","Ridley, S. O. (1882) Zoological collections made during the survey of H. M. S.`Alert' X. Coelenterata. Proceedings of the Zoological Society of London, 1882, 101 - 107."]}

Published
2020
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43. Alcyonium patagonicum

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Alcyoniidae, Animalia, Alcyonium patagonicum, Biodiversity, Alcyonacea, Anthozoa, Alcyonium, Taxonomy
Abstract

Alcyonium patagonicum (May, 1899) Material examined: BBB 2016: St. 5. Distribution: Argentinean Patagonian shelf, 44°14’S, 61°23’W (110 m) (Verseveldt & Ofwegen 1992), Beagle Channel (127 m) (present study). Remarks: Digitiform colonies attached to bivalve shells., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 219, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["May, W. (1899) Alcyonarien. In: Hamburger Magalhaensische Sammelreise, Friederichsen, L. & Co., Hamburg, pp. 1 - 22.","Verseveldt, J. & Ofwegen, L. P. (1992) New and redescribed species of Alcyonium Linnaeus, 1758 (Anthozoa: Alcyonacea). Zoologische Verhandelingen Leiden, 66 (7), 155 - 181."]}

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2020
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44. Balanophyllia malouinensis Squires 1961

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Scleractinia, Balanophyllia, Animalia, Biodiversity, Balanophyllia malouinensis, Anthozoa, Dendrophylliidae, Taxonomy
Abstract

Balanophyllia malouinensis Squires, 1961 Material examined: BBB 2016: St. 12; St. 13; St. 16; St. 18; St. 21; St. 23; St. 25; St. 36. PD BB 2017: St. 13; St. 14; St. 16; St. 31; St. 33; St. 34; St. 43 (Fig. 2H) (MACN-In: 41666, 41667, 41668, 41669, 41670, 41671, 41672, 41673). Distribution: Off Tierra del Fuego, Malvinas / Falkland Islands and Scotia Ridge between Burdwood bank and South Georgia, Drake Passage off Cape Horn, off Isla Desolación, Chile, 53ºS (Cairns 1982; Cairns et al. 2005). Remarks: This species was the most common scleractinid coral of the studied region. The collected specimens presented several epibionts (cnidarians, crustaceans) and were also used as settlement substrate for other species in the area. See Schejter & Bremec (2019) for detailed information on Scleractinia collected during these expeditions., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 217, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Cairns, S. D. (1982) Antarctic and Subantarctic Scleractinia. Biology of the Antarctic Seas XI. Antarctic Researsch Series, 34, 1 - 74. https: // doi. org / 10.1029 / AR 034 p 0001","Cairns, S. D., Haeusermann, V. & Forsterra, G. (2005) A review of the Scleractinia (Cnidaria: Anthozoa) of Chile, with the description of two new species. Zootaxa, 1018 (1), 15 - 46. https: // doi. org / 10.11646 / zootaxa. 1018.1.2","Schejter, L. & Bremec, C. S. (2019) Stony corals (Anthozoa Scleractinia) of Burdwood Bank and neighbouring areas, SW Atlantic Ocean. Scientia Marina, 83 (3), 247 - 260. https: // doi. org / 10.3989 / scimar. 04863.10 A"]}

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2020
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45. Caryophyllia coronula Cairns & Polonio 2013

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Scleractinia, Caryophyllia coronula, Animalia, Biodiversity, Caryophylliidae, Anthozoa, Caryophyllia, Taxonomy
Abstract

Caryophyllia coronula Cairns & Polonio, 2013 Material examined: PD BB 2017: St. 31; St. 34 (MACN-In 41675, 41676). Distribution: Continental slope off Golfo San Jorge, Argentina, 797–1553 m (Cairns & Polonio 2013). Remarks. The present finding representing the second mention of the species, extending the southern distribution limit to Burdwood bank (53,66668°S and 61,63667°W) (see Schejter & Bremec, 2019)., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 217, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Cairns, S. D. & Polonio, V. (2013) New records of deep-water Scleractinia off Argentina and the Falkland Islands. Zootaxa, 3691 (1), 58 - 86. https: // doi. org / 10.11646 / zootaxa. 3691.1.2","Schejter, L. & Bremec, C. S. (2019) Stony corals (Anthozoa Scleractinia) of Burdwood Bank and neighbouring areas, SW Atlantic Ocean. Scientia Marina, 83 (3), 247 - 260. https: // doi. org / 10.3989 / scimar. 04863.10 A"]}

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2020
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46. Tulpa tulipifera

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Hydrozoa, Tulpa, Tulpa tulipifera, Animalia, Biodiversity, Leptothecata, Campanulariidae, Taxonomy
Abstract

Tulpa tulipifera (Allman, 1888) Material examined: BBB 2016: St. 16; St. 18; St. 23; St. 28; St. 36; St. 40 (MACN-In: 43468, 43469, 43470, 43471, 43472). Distribution: This species was reported in Heard Island, 52°04’S, 71°22E, Burdwood bank and Malvinas /Faklands Islands as Campanularia tulipifera (Jäderholm, 1905); it is distributed from 41°S to 56°S (Oliveira et al. 2016). Remarks: Very abundant colonies were found, some of them with gonothecae and growing on soft-corals., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 214, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Jaderholm, E. (1905) Hydroiden aus antarktischen und subantarktischen Meeren gesammelt von der schwedischen Sudpolarexpedition. Wissenschaftliche Ergebnisse der Schwedischen Sudpolar-Expedition 1901 - 1903, 5, 1 - 41.","Oliveira, O. M. P, Araujo, E. M., Ayon, P., Cedeno-Posso, C. M., Cepeda, A. A., Cordova, P., Galea, H. R., Genzano, G. N., Haddad, M. A., Mianzan, H. W., Migotto, A. E., Miranda, L. S., Miranda, T. P., Morandini, A. C., Nagata, R. M., Nascimento, K. B., Nogueira Jr., M., Palma, S., Quinones, J., Rodriguez, C. S., Scarabino, F., Schiariti, A., Stampar, S. N., Tronolone, V. B. & Marques, A. C. (2016) Census of the Cnidaria (Ceriantharia and Medusozoa) and Ctenophora from South American marine waters. Zootaxa, 4194 (1), 1 - 256. https: // doi. org / 10.11646 / zootaxa. 4194.1.1"]}

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2020
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47. Bolocera kerguelensis Studer 1879

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Bolocera, Actiniidae, Animalia, Bolocera kerguelensis, Biodiversity, Anthozoa, Actiniaria, Taxonomy
Abstract

Bolocera kerguelensis Studer, 1879 Material examined: BBB 2016: St. 11; St. 12; St. 13; St. 17; St. 18; St. 21; St. 23; St. 36; St. 40 (Fig. 2K) (MLP-Oi 4203). Distribution: It is a common species in the area, previously recorded in the Argentinean shelf (Riemann-Zürneck 1980), Straits of Magellan (Chile), Drake Passage and Antarctic Peninsula (McMurrich 1893; Dunn 1983), and near the Burdwood bank (Dunn 1983). It was also recorded by Studer (1879) northwest of Kerguelen (48º30’S, 69º40’E, 219 m), by Carlgren (1938) in False Bay (34º15’S, 17º57’E, 91 m) and Agulhas Bank (35ºS, 20’E, 73–77 m). This is the first record in the MPA Namuncurá I., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 215, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Studer, T. (1879) Zweite Abtheilung der * Antozoa polyactinia *, welche wahrend der Reise S. M. S. Corvette Gazelle um die Erde gesammelt wurden. Monatsberichte der Akademie der Wissenschaften, Berlin, 1879, 524 - 550.","Riemann-Zurneck, K. (1980) Actiniaria des Sudwestatlantik V. Bolocera, Isotealia, Isosicyonis (Actiniidae). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 77, 19 - 33.","McMurrich, J. P. (1893) Report on the Actiniae collected by the United States Fish Commission Steamer Albatross during the winter of 1887 - 1888. Proceedings of the United States National Museum, 16 (930), 119 - 216.","Dunn, D. F. (1983) Some Antarctic and sub-antarctic sea anemones (Coelenterata: Ptychodactiaria and Actiniaria). Biology of the Antarctic Seas XIV, Antarctic Research Series, 39, 1 - 67. https: // doi. org / 10.1029 / AR 039 p 0001","Carlgren, O. (1938) South African Actiniaria and Zoantharia. Kungliga Svenska Vetenskapsakademiens Handlingar, 17 (3), 1 - 148."]}

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2020
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48. Hebella Allman 1888

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Hydrozoa, Hebellidae, Animalia, Hebella, Biodiversity, Leptothecata, Taxonomy
Abstract

Hebella sp. Material examined: BBB 2016: St. 5; St. 27; St. 32; St. 38; St. 39. Remarks: Scarce colonies attached on other hydroids (Abietinella operculata and S. subdichotomus) and on tubes of the polychaetes Chaetopterus antarcticus were found. Alike the genus Filellum, identification of Hebella to specific level is not possible when the material lacks reproductive structures. However the nominal species Hebella striata Allman, 1888 was widely reported in Argentinean continental shelf., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 210, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884

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2020
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49. Phialella chilensis

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Hydrozoa, Animalia, Phialella, Biodiversity, Leptothecata, Phialella chilensis, Phialellidae, Taxonomy
Abstract

Phialella chilensis (Hartlaub, 1905) Material examined: BBB 2016: St. 23. GARCÍA 2015: St. 4. Distribution: Phialella chilensis has originally been described from Calbuco, Chile (Vervoort 1972). The species has been reported in southwestern Atlantic from 34°S to 55°S by Jäderholm (1905) and Ritchie (1909) as Campanulina chilensis and by Blanco et al. (2000). Remarks: Small and well preserved colonies were found detached from substrate., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on pages 213-214, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Hartlaub, C. (1905) Die Hydroiden der Magalhaensischen Region und chilenischen Kuste. In: Fauna chilensis. Zoologische Jahrbucher, Supplement 6 (3), 497 - 714.","Vervoort, W. (1972) Hydroids from the Theta, Vema and Yelcho cruises of the Lamont Doherty Geological Observatory. Zoologische Verhandelingen, 120, 1 - 47.","Jaderholm, E. (1905) Hydroiden aus antarktischen und subantarktischen Meeren gesammelt von der schwedischen Sudpolarexpedition. Wissenschaftliche Ergebnisse der Schwedischen Sudpolar-Expedition 1901 - 1903, 5, 1 - 41.","Ritchie, J. (1909) Supplementary report on the hydroids of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh, 47, 65 - 101.","Blanco, O., Zamponi, M. O. & Genzano, G. N. (2000) Campanuliniidae de la Argentina (Coelenterata; Hydrozoa). Revista del Museo de La Plata, Nueva Serie, Zoologia, 14 (163), 267 - 278."]}

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2020
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50. Caryophyllia squiresi Cairns 1982

Author

Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A., and Bremec, C. S.

Subjects
Cnidaria, Scleractinia, Caryophyllia squiresi, Animalia, Biodiversity, Caryophylliidae, Anthozoa, Caryophyllia, Taxonomy
Abstract

Caryophyllia squiresi Cairns, 1982 Material examined: BBB 2016: St. 13; St. 18; St. 21; St. 25. PD BB 2017: St. 13; St. 14; St. 31; St. 34 (MACN-In: 41677, 41678, 41679, 41680, 41681, 41682, 41683, 41684, 41685). Distribution: Off Tierra del Fuego and Malvinas (Falkland) Islands at 406–659 m, recent records extended its range slightly north (42ºS) and expand its bathymetric range (Cairns & Polonio 2013). Remarks: Some individuals were settled on Balanophyllia malouinensis. This species was recorded at MPA Namuncurá II (see Schejter & Bremec 2019)., Published as part of Schejter, L., Genzano, G., Pérez, C. D., Acuña, F., Cordeiro, R. T. S., Silva, R. A., Garese, A. & Bremec, C. S., 2020, Checklist of Benthic Cnidaria in the SW Atlantic Ocean (54 ºS- 56 ºS), pp. 201-239 in Zootaxa 4878 (2) on page 217, DOI: 10.11646/zootaxa.4878.2.1, http://zenodo.org/record/4424884, {"references":["Cairns, S. D. (1982) Antarctic and Subantarctic Scleractinia. Biology of the Antarctic Seas XI. Antarctic Researsch Series, 34, 1 - 74. https: // doi. org / 10.1029 / AR 034 p 0001","Cairns, S. D. & Polonio, V. (2013) New records of deep-water Scleractinia off Argentina and the Falkland Islands. Zootaxa, 3691 (1), 58 - 86. https: // doi. org / 10.11646 / zootaxa. 3691.1.2","Schejter, L. & Bremec, C. S. (2019) Stony corals (Anthozoa Scleractinia) of Burdwood Bank and neighbouring areas, SW Atlantic Ocean. Scientia Marina, 83 (3), 247 - 260. https: // doi. org / 10.3989 / scimar. 04863.10 A"]}

Published
2020
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