Psolus lockhartae O'Loughlin & Whitfield, 2010, sp. nov.

• Main Authors: O'Loughlin, Mark, Whitfield, Emily
• Format: Other/Unknown Material
• Language: unknown
• Published: 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Dendrochirotida; Psolidae; Psolus; Psolus lockhartae; Scotia Sea; Burdwood Bank; Lockhart; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/6196621; https://doi.org/10.5281/zenodo.6196621

Psolus lockhartae sp. nov. Figures 4 a–f, 5. Material examined. Holotype. Antarctica, Scotia Sea, South Orkney Is, 60 º 36.21 'S 44 º 19.67 'W, 211 m, US AMLR 2009 stn 19 – 13, S. Lockhart, 13 Feb 2009, NMV F 168861. Paratypes. South Orkney Is, 60 º 26.52 'S 45 º 17.91 'W, 497 m, US AMLR 2009 stn 12 –7, 11 Feb 2009, NMV F 168857 (1); NMV F 168859 (5); NMV F 168860 (3). Other material. South Orkney Is, 298–302 m, USNM E 43073 (3); 593–598 m, USNM E 43074 (2); 2355–2897 m, USNM E 43076 (63); 567–671 m, USNM E 43080 (3); 759–857 m, USNM E 43081 (7); South Shetland Is, 300 m, USNM E 43075 (3); 220–240 m, USNM E 43078 (1); South Georgia, 1968–2188 m, USNM E 43079 (3); Burdwood Bank, 339–357 m, USNM E 43077 (4). Diagnosis. Psolus species up to 20 mm long, 10 mm high, 8 mm wide; form sub-cylindrical, smooth, rounded oral and anal ends, lacking oral and anal cone; scales up to 3 mm wide, imbricating, macroscopically smooth, microscopically finely beaded, mosaic arrangement of large and small, rounded and angular scales; lacking 5 discrete oral valves, oral scales numerous, digitiform or narrow pointed or triangular pointed; tentacles 10, 8 large, 2 small ventrally; calcareous ring with digitiform radial and interradial anterior projections, radial projections slightly swollen distally, concave radial and interradial posterior indentations; thin calcareous sole, single to zig-zag to double series of large inner peripheral tube feet, lacking outer peripheral series of smaller tube feet, rare mid-ventral tube feet present; single ventral polian vesicle; gonad tubules unbranched. Dorsal and lateral multilayered ossicles only. Sole with crosses, thick, finely knobbed or bluntly-spinous, shallow concave or cupped, small and large, commonly 88–112 µ m long, rarely 168 µ m long, upturned branched arms of crosses may join to form cups with up to 8 perforations, marginal projections sometimes joined to create anastomosing branches over cups or transverse bridges across cups. Largest tentacle ossicles irregularly oval or ...