Figures 7 D, E, G
Solaster tumidus Stuxberg 1878: 31
Asterina tumida Danielssen & Koren 1881: 182, pl. 1, 2; Danielssen & Koren 1884: 60, pl. 10, 11, 15
Asterina tumida tuberculata Danielssen & Koren 1884: 63, pl. 63, 10, 15
Rhegaster tumidus Sladen 1889: 367; Döderlein 1900: 219; Ludwig 1900: 459.
Poraniomorpha (Rhegaster) tumida Grieg 1907: 34.
Poraniomorpha tumida Mortensen 1913: 332; 1932: 9; von Hofsten 1915: 26; Einarsson 1948: 12; Grainger, 1966: 27, Figs. 7, 51; Djakonov 1950: 59 (English 1968: 49); Anisimova & Cochrane 2013: 122
Taxonomic comments. Poraniomorpha tumida lacks spines on its actinolateral fringe/inferomarginal plates, although granuliform spinules similar to those elsewhere on the body, are present on the actinolateral/ inferomarginal plates (Fig. 7 E). This species possesses an abactinal surface covered by patches of tiny granuliform spinelets (Fig. 7 G) and has an actinal surface covered by either widely dispersed pointed granules or very tiny, pointed papilliform spinelets (length = 0.5 mm). Three to five furrow spines in transverse series are present.
Occurrence. North Atlantic, West coast of Greenland, north and east coasts of Iceland, northeast of the Faeroe Channel, Denmark Strait, Jan Mayen Island, near Spitsbergen and northern Norway, throughout the Barents Sea, Kola Bay, White Sea and Kara Sea north to about 82 º. The Laptev Sea, East Siberian Sea east to 161 ºE. Hudson Bay, Beautfort Sea. 9–1203 m (30–300 according to Djakonov 1950).
Material examined. USNM E05361 Hudson Bay, North Atlantic 142.6 m (78 fms), Coll. R/V Loubyrne Sept. 1930 (1 dry spec. R= 3.6, r= 2.1); CASIZ 122301 western Beaufort Sea, 70 º 40.80 ’N, 145 º 24.90 ’W, 79.0 m, Coll. A. Carey, OSU (1 wet spec. R= 3.3, r= 1.6); CASIZ 142780 western Beaufort Sea, 70 º 33 ’N, 145 º 40 ’W, 41–50 m, Coll. A. Carey, OSU (1 wet spec. R= 2.9, r= 1.3); CASIZ 121456 western Beaufort Sea, 71 m, Coll. A. Carey, OSU 7 Aug 1972 (1 wet spec. R= 3.9, r= 2.3)