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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"]}

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"]}

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."]}

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."]}

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"]}

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

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."]}

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."]}

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"]}

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"]}