Antarctic and Sub-Antarctic species of Psolidium Ludwig (Echinodermata: Holothuroidea: Psolidae) Author O’Loughlin, P. Mark Author Ahearn, Cynthia text Memoirs of Museum Victoria 2008 2008-12-31 65 23 42 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-65-2008/pages-23-42/ journal article 10.24199/j.mmv.2008.65.2 1447-2554 10665899 Psolidium incubans Ekman, 1925 Figures 1f ; 4f Psolidium incubans Ekman, 1925: 5 , 113–116, text fig. 27.— Arnaud, 1974: 584 . — Gutt, 1988: 73 . Material examined . South Georgia , Discovery stn MS67, E Cumberland Bay , 38 m , 28 Feb 1926 , BM(NH) 2008.3190 ( 1 specimen ) . Diagnosis . Psolidium species up to 12 mm long; wrinkled body surface, created by high cups; dorsal and lateral scales not conspicuous; dorsal and lateral tube feet conspicuous. Sole: outer peripheral single series of smaller tube feet; inner peripheral single to zig-zag to double series of larger tube feet; lacking mid-ventral (sole) radial series of tube feet; sole soft, with folds for brood-protection. Dorsal ossicles: perforated plates with anastomosing secondary developments and multi-layering (scales), up to 700 μ m long, 0–2 tube foot canals per scale; shallow cups with 2 large central and 2 smaller end perforations, marginal knobs, cups 90 μ m long; deep goblet-like cups closed across rim, vertical blunt spines above rim, cups 70–90 μ m wide, 80–110 μ m high. Sole ossicles: shallow cupped crosses, shallow cups with small marginal knobs, cups 80 μ m long; shallow concave perforated plates, upturned marginal knobs, up to 14 perforations, plates up to 150 μ m long. Distribution. South Georgia , Cumberland Bay; 12– 38 m. Remarks . As noted by Ekman (1925) this small species of Psolidium brood-protects in folds of the sole.