Suberites topsenti Burton 1929

• Main Authors: Plotkin, Alexander S., Janussen, Dorte
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Hadromerida; Suberitidae; Suberites; Suberites topsenti; Antarctic; Weddell Sea; Ross Sea; McMurdo Sound; Weddell; Burton; Burdwood Bank; Antarc*
• Online Access: https://zenodo.org/record/6235815; https://doi.org/10.5281/zenodo.6235815

Suberites topsenti (Burton, 1929) (Figs. 16, 17) Synonymy Suberella topsenti — Burton 1929: 446, pl. IV (fig. 5). Laxosuberella topsenti— Burton 1930: 675. Suberites montiniger — Topsent 1915: 39 –40; Koltun 1964: 25 –26; 1976: 169. Suberites topsenti —van Soest 2002: 242. Material examined SMF 10582 (1 specimen): PS 67 /078­ 11; SMF 10583 –10584 (2 specimens): PS 67 / 110 ­ 2. Description External morphology. Sponges are compact, massive, irregularly shaped (figs. 16 A–C). The dimensions may reach 35 x 15 x 11 mm. Surface is minutely hispid or velvety, grey­coloured, with a single osculum of 0.4– 1 mm in diameter. Consistency is dense and compressible. Skeleton. The choanosomal skeleton is dense, confusedly reticulate, constituted by long spicules (fig. 16 D). The ectosomal skeleton is made of the smaller spicules arranged in bouquets (fig. 16 E). Spicules. Altogether 130 spicules from 2 specimens were measured. Two size categories are well distinguished (fig. 17 A). The number of measured spicules of each category is given below, separately for each specimen (n 1, n 2). Both long and small spicules vary from tylostyles to subtylostyles. They are straight, more or less slender, with terminal lobate tyles (figs. 17 B–E). The long spicules measure: length 857­ 1092 ­ 1368 µm, tyle diameter 14­18.8 ­ 22 µm, diameter of the shaft underneath the tyle 8 ­13.0­ 18 µm, maximal diameter of the shaft 8 ­14.0­ 19 µm (n 1 = 40, n 2 = 30). The dimensions of the small spicules are: length 300­479 ­ 743 µm, tyle diameter 14 ­ 17.0­ 27 µm, diameter of the shaft underneath the tyle 8­12.4 ­ 19 µm, maximal diameter of the shaft 11­13.4 ­ 22 µm (n 1 = 30, n 2 = 30). Type locality: Antarctic: Ross Sea: McMurdo Sound, depth unknown. Distribution: Antarctic: Antarctic near­continent sectors (as S. montiniger: Koltun 1964; Sarà et al. 1992): NN 3 and 5 including the Western Ross Sea, as deep as 700 m. Northern Weddell Sea, ca. 2150–4700 m (present study). SW Atlantic: Burdwood Bank, 102 m (as S. montiniger: Topsent 1915); Magellan ...