Polymastia invaginata Kirkpatrick 1907

• Main Authors: Goodwin, Claire, Brickle, Paul
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Polymastiida; Polymastiidae; Polymastia; Polymastia invaginata; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.5258173; http://treatment.plazi.org/id/03C8879CFFB4FFEBB1A4FE209099348A

Polymastia invaginata Kirkpatrick, 1907 (Figure 3) Synonymy: Polymastia invaginata Kirkpatrick, 1907. Polymastia invaginata var. gaussi Hentschel, 1914 is regarded as a synonym by Plotkin and Janussen (2008). Material: All samples in 95% ethanol, tissue section and spicule preparation on slides. BELUM Mc 7610. Rosita Harbour Site 2, South Georgia (54°00.649’S, 37° 25.618’W); depth 11.5m; collected by C. Goodwin, J. Brown, and S. Brown, 20 th November 2010. BELUM Mc 7618 and BELUM Mc 7620. Right Whale Bay, South Georgia (54°00.173’S, 37° 40.856’W); depth 18m; collected by C. Goodwin, J. Brown and S. Brown, 21 st November 2010. BELUM Mc 7648. 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. BELUM Mc 7660. Husvik, South Georgia (54°10.285’S, 36° 40.412’W); depth 18m; collected by C. Goodwin, D. Poncet and P. Brewin, 26 th November 2010. Comparative material examined: BMNH 03.2.5.78 Polymastia invaginata . Discovery Antarctic Expedition McMurdo Bay ~20fms. W.Q.28.2.02. Specimen in alcohol. This specimen is the figured half specimen in PL XIV Fig. 5 of the description. External morphology: In situ appearance: Brown hispid mound attached to bedrock bearing single, lemon yellow, smooth surfaced, large papillae with large terminal oscule. Individuals up to 20cm in height (Fig. 3a). Often occur in clusters of several individuals. Preserved appearance: Transverse slice of basal mound of specimen. Tissue very tough. Choanosome grey, cortical layer white and 2–3mm thick. A fringe of dark grey hairs ~ 5mm long present on the surface. Skeleton : Radiate skeleton of bundles of large styles, these penetrate the ectosome and form the thick surface pile (Fig. 3b). Stellate groups of small tylostyles are present between the fibres (Fig. 3c). The ectosome is formed of a dense tylostyles, positioned vertically with their points towards the surface. This layer forms a fibrous cortex to the sponge, easily visible on slides, ...