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���Skenea ��� ponsonbyi (Dautzenberg & H. Fischer, 1896) Fig. 15E���F Cyclostrema ponsonbyi Dautzenberg & H. Fischer, 1897: 176, pl. 4 figs 12���14. Skenea ponsonbyi ��� Hoffman et al. 2020c: 71���73. Material examined GALICIA BANK ��� 4 sh; 43��00.12��� N, 11��57.67��� W; 1706 m; 29 Jul. 2011; BANGAL 0711 V2; MNCN ��� 5 sh; 42��56.77��� N, 11��58.53��� W; 1631 m; 2 Aug. 2011; BANGAL 0711 V5; MNCN ��� 2 sh; 42��59.61��� N, 11��58.41��� W; 1671 m; 7 Aug. 2011; BANGAL 0711 V9; MNCN. Remarks This is, to our knowledge, the first time that this species is reported outside the Azores (Dautzenberg & Fischer 1896) and the South Azorean Seamount Chain (Hoffman et al. 2020c). The external sculpture recalls that of Moelleria costulata (M��ller, 1842), a boreal Atlantic species which belongs to the family Colloniidae Cossmann, 1917 and has a calcareous operculum fitting exactly the aperture; the flexuous contour of the aperture in the present species suggests that the operculum was flexible and that this similarity does not indicate reationship. For the time being, with no data on the living animal, there is no straightforward generic placement. Cyclostrema Marryat, 1819, a member of the family Liotiidae Gray, 1850 with also a calcareous operculum, is obviously inadequate and we conservatively use the catchall genus ��� Skenea ���, in a broad sense meaning a skeneimorph species, following in that WoRMS Editorial Board (2021)., Published as part of Gofas, Serge, Luque, ��ngel A., Oliver, Joan Daniel, Templado, Jos�� & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), pp. 1-114 in European Journal of Taxonomy 785 (1) on page 48, DOI: 10.5852/ejt.2021.785.1605, http://zenodo.org/record/5798418, {"references":["Hoffman L., Gofas S. & Freiwald A. 2020 c. A large biodiversity of \" skeneimorph \" (Gastropoda, Vetigastropoda) from the South Azorean Seamount Chain with the description of seventeen new species. Iberus supplement 9: 1 - 82.","Dautzenberg P. & Fischer H. 1896. Dragages effectues par l'Hirondelle et par la Princesse Alice 1888 - 1895. 1. Mollusques Gasteropodes. Memoires de la Societe zoologique de France 9: 395 - 498, pl. 15 - 22.","WoRMS Editorial Board. 2021. World Register of Marine Species. Available from http: // www. marinespecies. org / index. php [accessed 7 Mar. 2021]."]}

An illustrated checklist of the Mollusca of Galicia Bank, a large and deep seamount off the NW Iberian Peninsula, is provided. The studied material was collected in 8 samples of Seamount 1 cruise (1987), 7 samples of ECOMARG 0709 (2009) and 36 samples of BANGAL 0711 (2011), between 615 and 1768 m. A total of 212 species are known to occur at the Galicia Bank (1 Monoplacophora, 7 Solenogastres, 3 Polyplacophora, 132 Gastropoda, 54 Bivalvia, 6 Scaphopoda, and 9 Cephalopoda), 21 of which from previous studies only. Four species are described as new, 34 species are first record in Spanish waters and another 20 species first record for the Northern Spanish waters. Over 7500 specimens, representing 104 species, were collected alive, and 87 species were represented by empty shells only. Only 53 species were detected in both Seamount 1 and BANGAL 0711; most of the species are rare and more species can be expected if exploration is continued. There is a marked difference in species composition between the summit platform (615‒1000 m) and the deeper part below 1500 m, with some genera (e.g., Colus and Limopsis) represented by alternative species. Endemism, if any, is very low and most of the species are widespread.

Genus Anekes Bouchet & War��n, 1979 Type species Anekes undulisculpta Bouchet & War��n, 1979, by original designation., Published as part of Gofas, Serge, Luque, ��ngel A., Oliver, Joan Daniel, Templado, Jos�� & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), pp. 1-114 in European Journal of Taxonomy 785 (1) on page 48, DOI: 10.5852/ejt.2021.785.1605, http://zenodo.org/record/5798418

Genus Skenea Fleming, 1825 Type species Helix serpuloides Montagu, 1808, by subsequent designation., Published as part of Gofas, Serge, Luque, ��ngel A., Oliver, Joan Daniel, Templado, Jos�� & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), pp. 1-114 in European Journal of Taxonomy 785 (1) on page 48, DOI: 10.5852/ejt.2021.785.1605, http://zenodo.org/record/5798418

Genus Limopsis Sassi, 1827 TYPE SPECIES. — Arca aurita Brocchi, 1814, by monotypy.

Limopsis angusta Jeffreys, 1879 (Fig. 26 C, D) MATERIAL EXAMINED. ��� 1 spm, 47 v., DW126. REMARK Originally described from off south-western Portugal, new record for the Canaries., Published as part of Ortega, Jos�� Rafael & Gofas, Serge, 2019, The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca, pp. 513-551 in Zoosystema 41 (26) on page 545, DOI: 10.5252/zoosystema2019v41a26, http://zenodo.org/record/3726028

Genus Limopsis Sassi, 1827 TYPE SPECIES. ��� Arca aurita Brocchi, 1814, by monotypy., Published as part of Ortega, Jos�� Rafael & Gofas, Serge, 2019, The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca, pp. 513-551 in Zoosystema 41 (26) on page 545, DOI: 10.5252/zoosystema2019v41a26, http://zenodo.org/record/3726028

Limopsis angusta Jeffreys, 1879 (Fig. 26 C, D) MATERIAL EXAMINED. — 1 spm, 47 v., DW126. REMARK Originally described from off south-western Portugal, new record for the Canaries.

Ortega, José Rafael, Gofas, Serge (2019): The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca. Zoosystema 41 (26): 513-551, DOI: 10.5252/zoosystema2019v41a26

To broaden the anatomical knowledge of marine bivalves, detailed gross anatomical studies of 20 species from the Florida Keys are presented, representing 19 families: Solemya occidentalis Deshayes, 1857 (Solemyidae), Propeleda carpenteri (Dall, 1881) (Nuculanidae), Arcopsis adamsi (Dall, 1886) (Noetiidae), Limopsis aff. cristata Jeffreys, 1876 (Limopsidae), Brachidontes exustus (Linnaeus, 1758) (Mytilidae), Isognomon alatus (Gmelin, 1791) (Isognomonidae), Hyotissa mcgintyi (Harry, 1985) and H. hyotis (Linnaeus, 1758) (Gryphaeidae), Pinna carnea Gmelin, 1791 (Pinnidae), Spondylus americanus Hermann, 1781 (Spondylidae), Plicatula gibbosa Lamarck, 1801 (Plicatulidae), Anomia simplex d'Orbigny, 1853 (Anomiidae), Carditamera floridana Conrad, 1838 (Carditidae), Entodesma beana (d'Orbigny, 1853) (Lyonsiidae), Codakia orbicularis (Linnaeus, 1758) (Lucinidae), Chama macerophylla Gmelin, 1791 (Chamidae), Lamychaena hians (Gmelin, 1791) (Gastrochaenidae), Polymesoda floridana (Conrad, 1846) (Cyrenidae), La...

We present the first DNA taxonomy publication on abyssal Mollusca from the Clarion-Clipperton Zone (CCZ), central Pacific ocean, using material collected as part of the Abyssal Baseline (ABYSSLINE) environmental survey cruise 'AB01' to the UK Seabed Resources Ltd (UKSRL) polymetallic-nodule exploration area 'UK-1' in the eastern CCZ. This is the third paper in a series to provide regional taxonomic data for a region that is undergoing intense deep-sea mineral exploration for high-grade polymetallic nodules. Taxonomic data are presented for 21 species from 42 records identified by a combination of morphological and genetic data, including molecular phylogenetic analyses. These included 3 heterodont bivalves, 5 protobranch bivalves, 4 pteriomorph bivalves, 1 caudofoveate, 1 monoplacophoran, 1 polyplacophoran, 4 scaphopods and 2 solenogastres. Gastropoda were recovered but will be the subject of a future study. Seven taxa matched published morphological descriptions for species with deep Pacific type localities, and our sequences provide the first genetic data for these taxa. One taxon morphologically matched a known cosmopolitan species but with a type locality in a different ocean basin and was assigned the open nomenclature 'cf' as a precautionary approach in taxon assignments to avoid over-estimating species ranges. One taxon is here described as a new species, Ledella knudseni sp. n. For the remaining 12 taxa, we have determined them to be potentially new species, for which we make the raw data, imagery and vouchers available for future taxonomic study. The Clarion-Clipperton Zone is a region undergoing intense exploration for potential deep-sea mineral extraction. We present these data to facilitate future taxonomic and environmental impact study by making both data and voucher materials available through curated and accessible biological collections.

The bivalve Limopsis cristata pursues a semi-endobenthic life in abyssal soft sediments. It attaches to particles by up to three byssal threads and filter feeds by inhaling water from posterior and anterior directions. Because of partial burial, however, only the latter is functionally significant. Complex ciliary currents in the mantle cavity concerned with the rejection of unwanted particles keep most material out of the simplified intestine. It is generally considered that the ligament is the constraining force in arcoid evolution. This may be true in part, but the lack of pallial fusions and the retention of anterior and posterior inhalant flows are more powerful limits to radiation in the Arcoida. In the deep sea, the Limopsidae has radiated into many micro-niches through micro-morphological adaptations. Loss of the arcoid ‘heel’ has resulted in the union of the separate rejectory currents of the visceral mass and foot, creating a single discharge point in more advanced bivalves. This greatly simplifies the rejectory roles of the visceral mass and foot and is thus of functional and selective advantage.

Early ontogenetic shells of Limopsis angusta, L. aurita, L. cristata, L. friedbergi and L. minuta are described in detail and their morphogenetic traits discussed in a phylogenetic context. Prodissoconch length is found to range from 170–370 µm discounting the so-called prodissoconch 2 stage of authors. Reports of such a stage refer to the early postlarval ‘interdissoconch’. Prodissoconch sizes are indicative of lecithotrophy but not of brooding. Limopsid-like prodissoconchs are rather common among pteriomorphs and at present of little use for phylogenetic interpretations, therefore. The early postlarval hinge is characterized by two tooth generations: an early one, (G1), representing the postlarval continuation of provincular teeth, and a late one, (G2), representing the independent adult dentition. This is a plesiomorphic trait for Pteriomorphia. The postlarval ligament is continuous with the larval resilium; it is neither co-functional with nor is it substituted by the typical duplivincular li...

Nuculid bivalves of the Cape Melville Formation (Early Miocene, King George Island) are reviewed. Ten bivalve taxa are listed from the formation in the families Nuculidae (two species), Sareptidae, Malletiidae, Limopsidae (two species), Limidae, Pectinidae, Hiatellidae, and Periplomatidae. The Nuculidae consist of two species of Leionucula Quenstedt, 1930. One of these, L. melvilleana n. sp., is described and the other consists of the two species named previously by Anelli et al. (2006), which are demonstrated to be synonymous and are assigned to the species Leionucula frigida (Anelli, Rocha-Campos, Santos, Perinotto & Quaglio 2006). This assemblage, dominated by protobranchs (89% of specimens), is a typical fauna of offshore soft substrates, with a few specimens transported from hard substrates nearby. The diversity of Nuculidae has decreased in the Antarctic region through the Cenozoic.

Pacaud, Jean-Michel (2007): Nouveautés nomenclaturales et taxinomiques introduites par Alcide d'Orbigny dans le Prodrome (1850, 1852) pour les espèces du Paléocène et de l'Éocène. Geodiversitas 29 (1): 17-85, DOI: http://doi.org/10.5281/zenodo.5374882, {"references": ["ALLOITEAU J. 1957. - Contribution a la systematique des madreporaires fossiles. CNRS, Paris, 462 p.", "ANTON H. E. 1838. - Verseichniss der Conchylien welche sich in der Sammlung von Hermann Eduard Anton befinden. Herausgegeben von dem Besitzer. Eduard Anton, Halle, 110 p.", "ARCHIAC A. D' 1846. - Description des fossiles recueillis par M. Thorent dans les couches a nummulines des environs de Bayonne. Memoire de la Societe geologique de France 2 (2): 189-217.", "ARCHIAC A. D' 1850a. - Description des fossiles du groupe nummulitique recueillis par M. S. P. Pratt et M. J. Delbos aux environs de Bayonne et de Dax. Memoire de la Societe geologique de France 2 (3): 397-456.", "ARCHIAC A. 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Seven species of marine bivalves, including six new taxa, are described from the Cape early Miocene Melville Formation which crops out on the Melville Peninsula, King George Island, West Antarctica. The bivalve assemblage includes representatives of the families Nuculidae, Ennucula frigida sp. nov., E. musculosa sp. nov.; Malletidae, Neilo (Neilo) rongelii sp. nov.; Sareptidae, Yoldia peninsularis sp. nov.; Limopsidae, Limopsis psimolis sp. nov.; Hiatellidae, Panopea (Panopea) sp. cf. P. regularis; and Pholadomyoida (Periploma acuta sp. nov.). Species studied come from four sedimentary sections measured in the upper part of the unit. Detailed morphologic features of nucloid and arcoid species are exceptionally well preserved and allow for the first time reconstruction of muscle insertions as well as dentition patterns of Cenozoic taxa. Known geological distribution of the species is in agreement with the early Miocene age assigned to the Cape Melville Formation. The bivalve fauna from Cape Melville Format...

The functional and adaptive morphology of six species of the genus Limopsis from deep water of the Atlantic is investigated and the following species and subspecies are described: L. aurita, L. surinamensis (new species), L. tenella, L. minuta, L. cristata cristata, L. cristata affinis, L. cristata intermedia (new subspeices), L. cristata lanceolata (new subspecies), L. galathea . Species of the genus Limopsis are among the relatively few suspension-feeding bivalves of the deep sea. The genus is not represented in shelf faunas. It is byssate, but the species described here show a change in habit from the exobyssate to the endobyssate condition and a corresponding reduction in the number and coarseness of the byssus threads produced. While the morphology of the species is similar in all the species described, differences being restricted to minor variation in the gills and palps, the viscera are confined to a small dorsal portion of the mantle cavity. Thus, while small body size is related to the paucity of food, production of a large thick shell may require a relatively small proportion of the energy input and yet confer advantage possibly in protection and in feeding mechanism. Eggs are relatively few and of a size indicating that the larvae are planktonic but non-feeding. The widely occurring species L. tenella shows differences in the shell characters of different populations. In L. cristata variation is such that it has been possible to describe subspecies.