Rossella nuda Topsent 1901

• Main Authors: Goodwin, Claire, Brickle, Paul
• Format: Text
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Hexactinellida; Lyssacinosida; Rossellidae; Rossella; Rossella nuda; Antarctic; The Antarctic; Weddell Sea; Ross Sea; Victoria Land; McMurdo Sound; Bellingshausen Sea; Argentino; Weddell; Argentina; Burton; South Georgia Island; Jagged; Goodwin; Possession Bay; Antarc*; Antarctica; Antarctique*
• Online Access: https://dx.doi.org/10.5281/zenodo.5258200; https://zenodo.org/record/5258200

Rossella nuda Topsent, 1901 (Figure 22) Material: Samples in 95% ethanol, tissue section and spicule preparation on slides. BELUM Mc 7650. Jagged Point, Possession Bay, South Georgia (54°04.514’S, 37° 07.188’W); depth 10.4m; collected by C. Goodwin, D. Poncet and P. Brewin, 23 rd November 2010. Comparative material examined: BMNH Rossella nuda (Topsent) Discovery Antarctic Collection 1926- 27.Dried specimens RN CLVI II, R.N. CKVI I External morphology: In situ appearance: Large (maximum diameter> 100cm) vase shaped white sponge with lobose surface (Fig. 22a). Preserved appearance: Small slide of edge of sponge. Tough with a very hispid surface like a mat of hairs. Skeleton: Skeleton composed of free diactines with hypodermal diactines and pentactines, outer dermal spicules spined pentatines and hexactines. Spicules: Hypodermal diactines: (not measured, Barthel and Tendal (1994) report 2500–3500µm) Spined hexactine (Fig. 22b). Calycocome: very rare, one measured: 211µm in diameter (Fig. 22c). Oxyhexaster: diameter 101(181)247µm (Fig. 22d). Microdiscohexaster: diameter 30(32)35µm (Fig. 22e). Remarks: In the original description Topsent lists the microscleres as oxyhexasters 120µm in diameter, calcycocomes of a uniform diameter (250µm), microdiscohexasters 40–50µm in diameter, and larger discohexasters 100µm in diameter. The latter were only noted in small quantities and we didn’t find them in our specimen. Distribution: This specimen was situated in a small cave at 8m, attached to bedrock. Rossella nuda has been recorded on the Victoria Land coast from the eastern Weddell Sea to the Ross Sea, including McMurdo Sound, and the Bellingshausen Sea (Topsent 1901; Kirkpatrick 1907; Burton 1929; Koltun 1976; Barthel and Tendal, 1994; Janussen and Reiswig 2009); South Georgia (Burton 1940 but no details given, Barnes et al. 2006b) and the Falkland Islands (Burton 1940 but no details given) and the coast of Argentina (Burton 1940); from depths of 18–1579m. Burton (1929) recognised five species of Rossella including R. nuda but Koltun (1976) only recognised R. antarctica and R. racovitzae one of which he regarded as a ‘ highly polymorphic species’, many species have since been reinstated by Barthel and Tendal (1994). Barnes et al. (2006b) recorded specimens of Rossella nuda from Morraine Fjord on South Georgia at 18m, which were the shallowest known records for R. nuda at that time. : Published as part of Goodwin, Claire & Brickle, Paul, 2012, Sponge biodiversity of South Georgia island with descriptions of fifteen new species, pp. 1-48 in Zootaxa 3542 on pages 42-43 : {"references": ["Topsent, E. (1901) Notice preliminaire sur les eponges recueuillies par l'Expedition Antarctique Belge. Archives de Zoologie experimentale et generale, 3, 5 - 16.", "Barthel, D. & Tendal, O. S. (1994) Antarctic Hexactinellida. Theses Zoologicae. Volume 23, Synopses of the Antarctic Benthos Volume 6. (R Fricke, JW Wagele and J Sieg, Eds.). Koeltz Scientific Books, Champaign, Illinois, 154 pp.", "Kirkpatrick, R. (1907) Preliminary Report on the Monaxonellida of the National Antarctic Expedition. Annals and Magazine of Natural History 20, 271 - 291.", "Burton, M. (1929) British Antarctic (' Terra Nova') Expedition, 1910. Natural History Report. Porifera: Part II: Antarctic Sponges. Zoology, 6, 393 - 458.", "Koltun, V. M. (1976) Porifera - Part 1: Antarctic Sponges. Report B. A. N. Z. Antarctic Research Expedition 1929 - 1931 (B, Zoology and Botany), 5, 163 - 198.", "Janussen, D. & Reiswig, H. M. (2009) Hexactinellida (Porifera) from the ANDEEP III Expedition to the Weddell Sea, Antarctica. Zootaxa, 2136, 1 - 20.", "Burton, M. (1940) Las Esponjas marinas del Museo Argentino de Ciencias Naturales. (Parte 1). Anales del Museo argentino de ciencias naturales \" Bernardino Rivadavia \", 40, 95 - 121."]}