Polymastia invaginata Kirkpatrick 1907

• Main Authors: Ekins, Merrick, Erpenbeck, Dirk, Wörheide, Gert, Hooper, John N. A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Polymastiida; Polymastiidae; Polymastia; Polymastia invaginata; Antarc*; Antarctic; Antarctica; Ross Island; Windmill Islands
• Online Access: https://doi.org/10.5281/zenodo.10167719; http://treatment.plazi.org/id/153B577AFF9BC02CFF63206109821435

Polymastia invaginata Kirkpatrick, 1907 Figure 9, Table 5 Polymastia invaginata Kirkpatrick, 1907: 271; 1908: pp. 15–16, pl. XII(1b), pl. XIV (5–15a); Burton 1929: 446; Koltun 1964: 26, pl. IV (10–14); Boury-Esnault & van Beveren 1982: 36–37, pl. IV (13–14), Figs 9 D–F, Plotkin & Janussen 2008:102- 109, Figs 4–5, Tables 2–3. Polymastia invaginata var. gaussi Hentschel 1914: 49, Taf. V, Fig. 4. Material examined: QM G315026, Casey Antarctic Research Base, Windmill Islands, Antarctica, -66.2822, 110.5266, 30 m, SCUBA, Coll. M. Riddle & P. Goldsworthy, 10/XI/1997; QM G335958, same collection details as QM G315026; QM G311143, Mc Murdo Base, Cape Armitage, Ross Island, Antarctica, -77.85, 166.67, 20 m, north Jetty, Judy’s 1 st dome site, NCIS Q66C3091 -Z, SCUBA, Coll. Australian Institute of Marine Sciences and National Cancer Institute, 18/X/1989. Morphology: Solitary circular sponge with a bulbous cushion base 52–83 mm wide and 25–40 mm in height (Fig. 9 A–G). Partially burrowing with a single large contractile and retractile central papilla, 13–19 mm wide, height 0–3 mm above the dermis in preservative, and judging by Fig. 9 A, B equal in height as width in vivo. There is a large single oscule at the top of the papillae (1–2 mm wide). The sponge is grey/brown in life and in ethanol, reflecting the colouration of the surrounding mud/silt. The papillae are ivory to cream in life and ethanol (Fig. 9 A–G). The sponge is firm but compressible, and is covered in a soft covering of fine hairs (except the papilla). Skeleton: The ectosomal skeleton is composed of an erect palisade of smaller tylostyles on the base, absent from the papilla, with larger styles protruding out from the choanosomal tracts (Fig. 9 H, I). There is abundant sand/detritus on the surface providing grey colouration to the ectosome. The choanosomal skeleton consists of huge multispicular tracts diverging and providing support to the smaller ectosomal tylostyles (Fig. 9 H, I). Stellate formations of smaller tylostyles occur between the ...