Sphaerotylus antarcticus Kirkpatrick 1907

• Main Authors: Goodwin, Claire E., Berman, Jade, Hendry, Katharine R.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Hadromerida; Polymastiidae; Sphaerotylus; Sphaerotylus antarcticus; South Shetland Islands; Priestley; Goodwin; Grotto; Detaille; Grotto Island; Laktionov; Detaille Island; Laktionov Island; Antarc*; antarcticus; Martin Islands; Nelson Island
• Online Access: https://zenodo.org/record/5584981; https://doi.org/10.5281/zenodo.5584981

Sphaerotylus antarcticus Kirkpatrick, 1907 (Figure 24) Specimens. BELUM. Mc 2015.597, BELUM. Mc 2015.606, BELUM. Mc 2015.607 and BELUM. Mc 2015.613 Grotto Island, Verdansky Base (Site 1) (65°14.615’S, 64° 15.019’W), depth 14–24 m; collected by C. Goodwin and E. Priestley, 16/02/2015; BELUM. Mc 2015.620 Grotto Island, Verdansky Base (Site 2) (65°14.529’S, 64° 15.451’W), depth 6–18 m; collected by C. Goodwin and E. Priestley, 16/02/2015; BELUM. Mc 2015.635 Rocks near San Martin Islands (65°41.297’S, 65° 20.091’W), depth 6–21 m; collected by C. Goodwin and E. Priestley, 17/02/2015; BELUM. Mc 2015.658; Detaille Island (Site 1) (66°52.373’S, 66° 46.967’W), depth 6–24 m; collected by C. Goodwin and E. Priestley, 18/02/2015; BELUM. Mc 2015.687 Rocks NW of Laktionov Island (65°45.536’S, 65° 47.319’W), depth 6–23 m; collected by C. Goodwin and E. Priestley, 22/02/2015; BELUM. Mc 2015.743 Rocks on west side of Pleneau Island (65°06.407’S, 64° 04.417’W), depth 8–12 m; collected by C. Goodwin and E. Priestley, 24/02/2015; BELUM. Mc 2015.812 and BELUM. Mc 2015.823; Nelson Island, South Shetland Islands (62°59.607’S, 60° 33.601’W), depth 7–18 m; collected by C. Goodwin and E. Priestley, 27/02/2015. External morphology. In situ appearance (Figure 24A): Low oval lobe with densely hispid brown surface. From the lobe transluscent conical papillae, up to 3 cm in length, arise. These are yellow in colour but some are tinged brown. Preserved appearance. Pale brown sponge. Columns visible in interior. Cortical layer about 0.5–1 mm thick. Ectosomal projecting spicules very dense, giving a fur like appearance. Project up to 5 mm. Smooth papillae visible but shrunken. Alcohol is yellow. Skeleton (Figure 24C): From BELUM.Mc2015.635. Choanosome formed of thick radiating columns of over 20 styles with sphaerotyles nearer the surface. These cross the cortex and form a dense and thick surface hispidation. The cortex is formed of a sub-cortical tangential layer of smaller cortical styles and a dense palisade of tylostyles. Some sphaerotyles ...