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Cairns, Stephen D., Kitahara, Marcelo V. (2022): Replacement name for the junior homonym Microtrochus Kitahara & Cairns, 2021 (Cnidaria: Anthozoa: Scleractinia). Zootaxa 5175 (2): 300-300, DOI: https://doi.org/10.11646/zootaxa.5175.2.8

Deltocyathus corrugatus Cairns, 1999 (Fig. 1G) Deltocyathus corrugatus Cairns, 1999: 98. TYPE MATERIAL. — The holotype is at the NZOI (H 689), and 10 paratypes are deposited at the USNM (94169 [5], and 94170 [5]). TYPE LOCALITY. — 28°54’36’’S, 167°44’12’’E (Norfolk Islands), 390 m. NEW RECORDS. — BATHUS 4, stn DW 898, 8 specimens (MNHN-Scl.2008-0019); stn CP 883, 2 specimens (MNHN-Scl.2008-0020); 1 specimen (USNM 1114161); stn DW 903, 2 specimens (MNHN-Scl.2008-0021); stn CP 885, 1 specimen (MNHN-Scl.2008-0022); stn CP 889, 3 specimens (MNHN-Scl.2008-0023); 3 specimens (USNM 1114162); stn CP 967, 3 specimens (MNHN-Scl.2008-0018). DISTRIBUTION. — New Caledonia waters from 18°59.93’S, 163°13.55’E to 23°02.53’S, 166°58.18’E, including Loyalty Islands (Cairns 1995), 250- 600 m. Previous records: from southern Great Barrier Reef, Australia (Wells 1984) to Norfolk Ridge, New Zealand (Cairns 1995), 73- 390 m. DESCRIPTION Corallum circular. Calice lancetted, lancets correspond to each C3 flanked by C4. Largest specimen examined (BATHUS 3, stn CP 847) 15 mm in calicular diameter and 4.2 mm in height. Corallum usually white but sometimes slightly reddish-brown pigmented. Base flat to slightly convex, having a small scar of previous attachment (during early stages) in centre. All costae well developed. C1-2 more prominent near calicular edge, becoming a row of granules near centre of base. C3 thickest and tallest costae, extending up to 2 mm and normally upturned slightly beyond calicular edge as granulated costal spines. C4 and C3 form a broad three-step ridge. All costae granulated specially near calicular edge, and a small low granule ridge is present beside each C1-2. Septa hexamerally arranged in 4 complete cycles (S1≥S2>S4>S3). S1 independent, extending half distance to columella and bearing a wide lamellar palus, which is often fused to columella. S2 equal to or slightly less wide than S1, also bearing a pali of same size of P1, forming a crown more recessed from columella than the crown formed by P1. S3 smallest septa, bearing the tallest pali which fuse to inner edge of near P2 by a porous lamella. S4 slightly wider than S3, and have a spinose margin. Each S4 fuses the adjacent P3 through a long porous lamella. All pali equal sized (P1 sometimes dimorphic) and septa and palar faces bear pointed granules. Fossa shallow with an elliptical papillose columella. REMARKS See Remarks of D. ornatus., Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2009, A revision of the genus Deltocyathus Milne Edwards & Haime, 1848 (Scleractinia, Caryophylliidae) from New Caledonia, with the description of a new species, pp. 233-248 in Zoosystema 31 (2) on pages 243-244, {"references":["CAIRNS S. D. 1995. - The marine fauna of New Zealand: Scleractinia (Cnidaria Anthozoa). New Zealand Oceanographic Institute Memoir 103: 1 - 210.","WELLS J. W. 1984. - Notes on Indo-Pacific scleractinian corals. Part 10. Late Pleistocene ahermatypic corals from Vanuatu. Pacific Science 38 (3): 205 - 219."]}

Deltocyathus suluensis Alcock, 1902 (Fig. 1C) Deltocyathus italicus – Alcock 1902c: 19 (in part). Deltocyathus magnificus var. suluensis Alcock, 1902c: 20, 21. — Faustino 1927: 76, 77. — Yabe & Eguchi 1937: 129. — Van Soest 1979: 111, pl. 2, figs 3, 4. Deltocyathus formosus Cairns, 1995: 73, 74, pl. 19, figs f, g. Deltocyathus suluensis. — Cairns & Zibrowius 1997: 125, fig. 16d. — Cairns 1998: 382; 1999a: 92; 2004: 281. — Cairns et al. 1999: 22. TYPE MATERIAL. — The types of D. suluensis are presumed to be deposited at the IM. The holotype (CO266) of D. formosus and one paratype (CO228) are deposited at the MoNZ. Additional paratypes are deposited at NZOI (station numbers: stn K826 [1], K828 [2], and K870 [1]), and at the USNM (94171 [3], 94172 [1], and 94173 [6]). TYPE LOCALITY. — 5°43’N, 119°40’E- 6°11’N, 120°37’E (Sulu Archipelago), 450-522 m (D. magnificus var. suluensis). 29°13.96’S, 177°52.84’W (Kermadec Ridge), 530-567 m (D. formosus). NEW RECORDS. — BATHUS 3, stn DW 786, 3 specimens (MNHN-Scl.2008-0005). — BATHUS 4, stn CP 889, 2 specimens (MNHN-Scl.2008-0006). — NORFOLK 2, stn DW 2097, 3 specimens (MNHN-Scl.2008-0007); stn DW 2104, 1 specimen (MNHN-Scl.2008-0008). DISTRIBUTION. — New Caledonia waters from 21°00.83’S, 164°27.34’E to 24°44’S, 169°49.15’E, 416- 752 m. Previous records: Indian Ocean off western Australia from Dampier Land to Port Hedland (Cairns 1998; 2004), 401-530 m; Pacific Ocean from Philippines and Indonesian region (Cairns & Zibrowius 1997), 204-540 m to southern Norfolk Ridges, New Zealand (Cairns 1995), 142-565 m, including Wallis and Futuna region and Vanuatu region (Cairns 1999), 400-650 m, and off Queensland, Australia (Cairns 2004), 246-1050 m. DESCRIPTION Corallum circular with base flat to slightly convex. Calicular margin serrate but not lancetted. Largest specimen examined (BATHUS 3, stn DW 786) 22 mm in calicular diameter and 7 mm in height. Costae present as round granular ridges separated by well-defined same width intercostal furrows. Only C1-2 originates at centre of base. Septa hexamerally arranged in 5 complete cycles (S1≥S2>S3>S4>>S5). S1 only independent septa and extend half distance to columella, being separated from their pali by a moderately wide notch. Higher septal cycles progressive less wide. S1-4 and P1-4 arranged in a typical Deltocyathus fashion, fusing through porous processes. S5 rudimentary. Fossa shallow containing a well-developed papillose columella. REMARKS See Remarks of D. magnificus and D. rotulus., Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2009, A revision of the genus Deltocyathus Milne Edwards & Haime, 1848 (Scleractinia, Caryophylliidae) from New Caledonia, with the description of a new species, pp. 233-248 in Zoosystema 31 (2) on pages 239-240, {"references":["ALCOCK A. W. 1902 c. - Report on the deep-sea Madreporaria of the Siboga Expedition. Siboga-Expedite 16 a: 1 - 52.","FAUSTINO L. A. 1927. - Recent Madreporaria of the Philippine Islands. Monographs, Philippine Bureau of Science 22: 1 - 310.","YABE H. & EGUCHI M. 1937. - Notes on Deltocyathus and Discotrochus from Japan. The Scientific Reports of the Tohoku Imperial University, Sendai, Japan, Second Series (Geology) 19 (1): 127 - 147.","VAN SOEST R. W. M. 1979. - A catalogue of the Coelenterate type specimens of the Zoological Museum of Amsterdam, IV: Gorgonacea, Actiniaria, Scleractinia. Beaufortia 29 (353): 81 - 126.","CAIRNS S. D. 1995. - The marine fauna of New Zealand: Scleractinia (Cnidaria Anthozoa). New Zealand Oceanographic Institute Memoir 103: 1 - 210.","CAIRNS S. D. & ZIBROWIUS H. 1997. - Cnidaria Anthozoa: azooxanthellate Scleractinia from the Philippine and Indonesian regions. Memoires du Museum national d'Histoire naturelle 172 (2): 27 - 243.","CAIRNS S. D. 1998. - Azooxanthellate Scleractinia (Cnidaria: Anthozoa) of western Australia. Records of the Western Australian Museum 18: 361 - 417.","CAIRNS S. D., HOEKSEMA B. W. & VAN DER LAND J. 1999. - Appendix: list of extant stony corals. Atoll Research Bulletin 459: 13 - 46.","CAIRNS S. D. 2004. - The Azooxanthellate Scleractinia (Coelenterata: Anthozoa) of Australia. Records of the Australian Museum 56 (3): 259 - 329."]}

Deltocyathus crassiseptum Cairns, 1999 (Fig. 1H) Deltocyathus crassiseptum Cairns, 1999: 94, fig. 12c-f. TYPE MATERIAL. — The holotype and 78 paratypes are deposited at the MNHN (uncatalogued), and 39 at the USNM (98681 [2], 98682 [9], 98683 [13], 98684 [8], 98685 [2], 98686 [5]). TYPE LOCALITY. — 19°21’S, 169°25’E (Tanna), 433- 450 m. NEW RECORDS. — BATHUS 3, stn CP 818, 4 specimens (MNHN-Scl.2008-0024). — BATHUS 4, stn CP 889, 1 specimen (MNHN-Scl.2008-0026). — HALIPRO 1, stn CP 877, 1 specimen (MNHN-Scl.2008- 0025). — NORFOLK 2, stn DW 2041, 2 specimens (MNHN-Scl.2008-0027); stn DW 2024, 6 specimens (MNHN-Scl.2008-0028); 6 specimens (USNM 1114122); stn DW 2025, 1 specimen (MNHN-Scl.2008-0029); stn DW 2097, 2 specimens (MNHN-Scl.2008-0030); stn DW 2117, 2 specimens (MNHN-Scl.2008-0031). DISTRIBUTION. — New Caledonia waters from 21°00.83’S, 164°27.34’E to 24°44’S, 168°06’E, 370-583 m. Previous records: Wallis and Futuna region (Cairns 1999), 420- 510 m; Vanuatu region (Cairns 1999), 413-536 m. DESCRIPTION Corallum circular to slightly elliptical shaped as a shallow bowl.Theca thick.Base flat to slightly convex, usually with a scar, and sometimes protuberant. Largest specimen examined (BATHUS 3, stn CP 877) 14.2 mm in calicular diameter and 4.6 mm in height. However, smaller coralla show a CD:HT ratio near 2. Costae unequal and more prominent at calicular edge where they are separated by intercostal grooves bisected by a row of low and rounded granules that sometimes resemble a small ridge in the valley formed by the adjacent costae. C1-2 broader than other costae. Corallum white to reddish-brown. Septa hexamerally arranged in four cycles (48 septa) with septal formula: S1>S2>S3>S4. However, in larger coralla up to 3 pairs of S5 are present resulting in 56 septa. S1 thick and most exsert septa, extending half distance to columella and bear a dimorphic lamellar paliform lobe. Those paliform lobes before the two principal S1 are narrower than the other four P1, but all reach the columella. S2 equal to slightly smaller and less exsert than S1, also bearing a paliform lobe that reaches columella by a small paliform teeth. S3 about ¾ width of S2, bearing a tall recessed pali that fuses P 2 in a chevron arrangement typical of the genus. S4 smallest septa and in some coralla composed by a row of spines. All septal and palar faces very granular. Fossa shallow to moderately deep, containing a papillose columella. REMARKS First time reported since the original description, the specimens of D. crassiseptum are distinguished from the New Caledonia congeners by having: a slighty thicker S 1-2 in relation to the other septa, corallum shaped as a bowl, absence of costal spines, well-arranged crowns formed by the paliform lobes, and paliform lobes and columellar elements that terminate below the septa upper edges. Different pigmentation patterns can be found in New Caledonia specimens of D. crassiseptum: some have the entire calicular edge and septa reddish-brown, other specimens present only the S3 and paliform lobes pigmented, some are completely pigmented and some are enterely white., Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2009, A revision of the genus Deltocyathus Milne Edwards & Haime, 1848 (Scleractinia, Caryophylliidae) from New Caledonia, with the description of a new species, pp. 233-248 in Zoosystema 31 (2) on page 244

Crispatotrochus rubescens (Moseley, 1881) Plate 1, Figs. A–D, F–G Cyathoceras rubescens Mosely, 1881: 157, pl. 2, figs. 8a–c. — Marenzeller, 1888: 21–22. — Yabe and Eguchi, 1942: 117. — Wells, 1964: 112. — Cairns, 1982: 22. — Cairns, 1984: 5, 15. Cyathoceras tydemani Alcock, 1902a: 93–94; 1902 b: 14, pl. 1, figs. 7, 7a. — Faustino, 1927: 65, pl. 9, figs. 5–6. — Cairns, 1982: 22. Cyathoceras diomedeae Vaughan, 1907: 77–78, pl. 7, figs. 1–2. — Vaughan, 1919: 1917, pl. XIII, figs. 2, 2a. — Yabe and Eguchi, 1942: 116–117, pl. 9, fig. 8. — Vaughan and Wells, 1943: 333, pl. 41, figs. 14, 14a. — Wells, 1964: 112. — Cairns, 1982: 22. Crispatotrochus rubescens — Cairns, 1991: 15; — Cairns, 1994: 22, 51, pl. 22, figs. g–h. — Cairns and Zibrowius, 1997: 103–104, figs. 10a–c. —Cairns, 1999: 76–77. — Cairns et al. 1999: 21. — Cairns, 2004: 265, 279–280. Material examined. Bathus 3 station CP 833, 2 (MNHN-Scl.2008-0041 [1], USNM 1115428 [1]). Description. Corallum ceratoid, elongate, slightly curved, and flared distally. Pedicel robust ranging from 4.2 to 5.5 mm in diameter (PD:GCD = 0.26–0.31), expanding to a thin encrusting base. Largest specimen examined (USNM 1115428) 21 x 16.8 mm in CD and 37.2 mm in height. Costae more prominent (as low ridges) near calicular edge, fading to pedicel. Theca granular. Corallum white. Septa hexamerally arranged in five complete cycles according to formula S1–2>S3>S4>S5, but largest specimen displays some rudimentary S6. S1–2 highly exsert, with sinuous vertical axial edges that fuse to columella. S3 four fifths width of S1–2 with slightly less sinuous inner edges. S4 three fourths width of S3, with less sinuous axial edges. S5 half width of S4. S6, if present, rudimentary and present only at calicular margin. Fossa of moderate depth, containing an elongate columella consisting of 4–9 slender, twisted elements. Remarks. Among the species of Crispatotrochus that have 5 complete hexamerally arranged septal cycles (C. rubescens, C. foxi, and C. niinoi), all of which occur in temperate Pacific, C. rubescens is distinguished by having sinuous axial septal edges for S1 and S2, and costate theca at least near the calicular margin. One new record reported herein of C. rubescens (USNM 1115428) has 96 rudmentary S6, present only near calicular edge. Type locality. Kai Islands, Banda Sea (5º49’15’’S, 132º14’15’’E), 236 m. Type specimens. According to Cairns (1984) the holotype is lost. Distribution. New Caledonia: 23º02.85’S, 166º58.23’E, 441– 444 m. Elsewhere: Wallis and Futuna; Vanuatu – Tanna; Australia – off Queensland; Philippines –Lubang Island, south of Negros (Bohol Sea), Sulu Archipelago (Sulu Sea); Indonesia – Kai Islands (Banda Sea), south of Tanimbar Islands (Arafura Sea), Sumba (Savu Sea); China – southern Formosa Strait (south China Sea); Japan – Sagami Bay and off Kushimoto (Honshu), Shikoku, and off Koshiki (Kyushu); Hawaii – Maui, Moloka‘i, O‘ahu, and Kaua‘i, and Nihoa, Blank, and Brooks Banks; Christmas Islands; 110– 634 m., Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2008, New records of the genus Crispatotrochus (Scleractinia; Caryophylliidae) from New Caledonia, with description of a new species, pp. 59-68 in Zootaxa 1940 (1) on pages 63-64, DOI: 10.11646/zootaxa.1940.1.6, http://zenodo.org/record/5230999, {"references":["Moseley, H. N. (1881) Report on certain hydroid, alcyonarian, and madreporarian corals procured during the voyage H. M. S. Challenger, in the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 79, Zoology, 2, 248 pp.","Marenzeller, E. von. (1888) Ueber einige japanische Turbinoliiden. Annalen des Kaiserlich - Koniglichen Naturhistorischen Hofmuseums Wien, 3, 15 - 22.","Yabe, H. and Eguchi, M. (1942) Fossil and Recent simple corals from Japan. The Scientific Reports of the Thoku Imperial University, Sendai, Japan, Second Series (Geology), 22, 105 - 78.","Wells, J. W. (1964) Ahermatypic corals from Queensland. Papers from the Departament of Zoology, University of Queensland, 2, 107 - 121.","Cairns, S. D. (1982) Antarctic and Subantarctic Scleractinia. Antarctic Research Series, 34, 74 pp.","Cairns, S. D. (1984) New records of ahermatypic corals (Scleractinia) from the Hawaiian and Line Islands. Occasional Papers of the Bernice Pauahi Bishop Museum, 25, 1 - 30.","Alcock, A. W. (1902 a) Diagnosis and descriptions of new species of corals from the Siboga expedition. Tijdschrift der Nederlandsche Dierkundige Vereeniging, ser. 2, 7, 89 - 115.","Alcock, A. W. (1902 b) Report on the deep-sea Madreporaria of the Siboga-Expedition. Siboga Expeditie, 16 a, 52 p.","Faustino, L. A. (1927) Recent Madreporaria of the Philippine Islands. Monographs, Philippine Bureau of Science, 22, 1 - 310.","Vaughan, T. W. (1907) Recent Madreporaria of the hawaiian Islands and Laysan. Bulletin of the United States National Museum, 59, 427 pp.","Vaughan, T. W. (1919) Fossil corals from Central America, Cuba, and Porto Rico, with an account of the American Tertiary, Pleistocene, and Recent coral reefs. Bulletin of the United States National Museum, 103, vi + 189 - 524.","Vaughan, T. W. and Wells, J. W. (1943) Revision of the suborders, families and genera of the Scleractinia. Geological Society of America Special Papers, 44, 1 - 363.","Cairns, S. D. (1991) A revision of the ahermatypic Scleractinia of the Galeapagos and Cocos Islands. Smithsonian Contributions to Zoology, 504, 44 pp.","Cairns, S. D. (1994) Scleractinia of the temperate north Pacific. Smithsonian Contributions to Zoology, 557, 150 pp.","Cairns, S. D. and Zibrowius, H. (1997) Cnidaria Anthozoa: azooxanthellate Scleractinia from the Philippine and Indonesian Regions. Mmoires du Musum National D'Histoiore Naturelle, 172, 27 - 243.","Cairns, S. D., Hoeksema, B. W. and Van der Land, J. (1999) Appendix: List of Extant Stony Corals. Atoll Research Bulletin, 459, 13 - 46.","Cairns, S. D. (2004) The Azooxanthellate Scleractinia (Coelenterata: Anthozoa) of Australia. Records of the Australian Museum, 56, 259 - 329."]}

Key to the Recent species of Crispatotrochus 1 Septa arranged hexamerally.........................................................................................................................2 - Septa arranged decamerally.......................................................................................................................11 2 Pedicel unattached; corallum cornute ................................................................... Crispatotrochus curvatus - Pedicel attached; ceratoid to turbinate.........................................................................................................3 3 S1 larger than S2..........................................................................................................................................4 - S1 equal in width to S2................................................................................................................................5 4 Theca transverse ridged; S1 and S2 sinuous .......................................................... Crispatotrochus rugosus - Theca not transversed ridge; S1 and S2 not sinuous ................................. Crispatotrochus septumdentatus 5 S1–2 with sinuous inner edges....................................................................................................................6 - S1–2 with straight inner edges.....................................................................................................................9 6 S3 with sinuous inner edges........................................................................................................................7 - S3 with straight inner edges..................................................................................... Crispatotrochus cornu 7 Columella fused, composed of closely united, poorly defined, twisted ribbons Crispatotrochus irregularis - Columella with well defined columellar elements......................................................................................8 8 Septa arranged in four complete cycles; fossa nonextant ............................. Crispatotrochus galapagensis - Septa arranged in five (complete) or six (incomplete) cycles; fossa moderately deep.................................. ............................................................................................................................ Crispatotrochus rubescens 9 Costae absent .......................................................................................................... Crispatotrochus niinoi - Costae present (ridged or flat).................................................................................................................. 10 10 Columella composed of 4–7 broad, twisted laths; S5 present; costae slightly ridged near calicular edge......................................................................................................................................... Crispatotrochus foxi - Columella composed of 28–32 narrow, twisted laths; S5 absent; costae flat ...... Crispatotrochus inortatus 11 S1 exsert.....................................................................................................................................................12 - S1 nonexsert .......................................................................................................... Crispatotrochus squiresi 12 Last septal cycle with serrate to lacerate inner edges................................................................................13 - Last septal cycle with entire inner edges..................................................................................................14 13 GCD = 6................................................................................................................. Crispatotrochus woodsi - GCD> 6........................................................................................... C. sp. cf. C. cornu sensu Cairns, 1979 14 Adult stage with more than 3 cycles of septa (>40 septa)................................. Crispatotrochus gregarius - Adult stage with three cycles of septa (= 40 septa)......................................... C. sp. A sensu Cairns, 1982, Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2008, New records of the genus Crispatotrochus (Scleractinia; Caryophylliidae) from New Caledonia, with description of a new species, pp. 59-68 in Zootaxa 1940 (1) on pages 62-63, DOI: 10.11646/zootaxa.1940.1.6, http://zenodo.org/record/5230999, {"references":["Cairns, S. D. (1979) The deep - water Scleractinia of the Caribbean and Adjacent Waters. Studies on the Fauna of Curacao and other Caribbean Islands, 57, 341 pp.","Cairns, S. D. (1982) Antarctic and Subantarctic Scleractinia. Antarctic Research Series, 34, 74 pp."]}

Crispatotrochus septumdentatus, sp. nov. Plate 1, figs. K–L, N–R Holotype. Norfolk 2 station DW 2124 (MNHN-Scl.2008-0046) Paratypes. Bathus 4 station DW 894, 1 (MNHN-Scl.2008-0047); Norfolk 2 stations DW 2041, 2 (USNM 1115444), DW 2093, 1 (MNHN-Scl.2008-0048), DW 2117, 1 (MNHN-Scl.2008-0049), DW 2123, 1 (MNHN-Scl.2008-0050), and DW 2125, 1 (MNHN-Scl.2008-0051) Description. Corallum ceratoid, elongate, curved, and usually slightly flared distally. Corallum attached through a robust pedicel (PD:GCD = 0.32–0.47) and a thin encrusting base of approximately 0.2–0.4 mm in width. Largest specimen analysed (USNM 1115444) 9.4 x 9.0 mm in calicular diameter and 21.5 mm in height. Calice circular to slightly elliptical even in small coralla (GCD:LCD = 1.04–1.15), calicular margin jagged, with high lancets corresponding to fusion of each pair of S4 with their adjacent S1 and smaller lancets to fusion of each pair of S4 with their adjacent S2. All costae ridged near calicular edge, slightly convex, and separated by thin intercostal striae. C1–2 more prominent and usually wider than C3–4, sometimes extending to pedicel. Theca uniformly covered by small pointed granules. Almost all specimens analysed bear some very thin, not uniform, continuous transverse ridges (more prominent in worn specimens). Corallum white. Septa hexamerally arranged in four cycles according to the formula S1>S2>S3>>S4. S1 most exsert septa (up to 2 mm), and much thicker than higher cycle septa, with straight axial edges that reach and fuse to columella deep in fossa. Some specimens bear septal teeth (?) on S1 just above the fusion point with columella. S2 less exsert (about 1 mm) also with straight axial edges that sometimes fuse to columella. If S2 fuse to columella they also bear septal teeth, however, if not fusing, S2 disappear deep in fossa. S3 about one fourth to half width of S2, slightly sinuous, and commonly have lacerate axial edges. S4 rudimentary, composed of a row of granules, and dimorphic in exsertness. A pair of S4 fuse with each S1–2 near calicular edge forming lancets that alternate in height. Those fused with S1 are almost as exsert as S2, and those fused to S2 are the least exsert septa. Septal faces bear sparse, low, pointed granules. Fossa deep, containing a large elliptical columella composed of closely grouped, slender ribbons, usually fused into a solid mass. Remarks. Among the 14 Recent species of Crispatotrochus, C. septumdentatus is most easily distinguished by the unusual presence of septal teeth on the lower axial edges of S1 and S2, the latter only when fused with the columella. The presence of transverse ridges in some specimens is probably related to the expansion of the tissue over the external part of theca (e.g.: the specimen Bathus 4 station DW 894 has lower 3/4 of corallum very encrusted, being separated from the unencrusted higher part by thin transverse ridges). Etymology. The species name septumdentatus (Latin septum, fence, edge, wall, partition + dentatus, toothed) refers to the small teeth structures present on the primaries’ axial septal margins. Type locality. New Caledonia region (Norfolk 2 station DW 2124– 23º18’S, 168º15’E, 260–270 m). Distribution. Known only in the New Caledonia region, ranging from 20º15.77’S, 163º52.03’E to 24º44’S, 168º09’E, 187– 400 m., Published as part of Kitahara, Marcelo V. & Cairns, Stephen D., 2008, New records of the genus Crispatotrochus (Scleractinia; Caryophylliidae) from New Caledonia, with description of a new species, pp. 59-68 in Zootaxa 1940 (1) on page 65, DOI: 10.11646/zootaxa.1940.1.6, http://zenodo.org/record/5230999