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

• Main Authors: O'Loughlin, Mark, Whitfield, Emily
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Dendrochirotida; Psolidae; Psolus; Psolus lockhartae; Antarc*; Antarctica; Scotia Sea
• Online Access: https://doi.org/10.5281/zenodo.6196621; http://treatment.plazi.org/id/03F287FA1970BD75FF12FEA3FA2CFD29

Psolus lockhartae sp. nov. Figures 4 a–f, 5. Material examined. Holotype. Antarctica, Scotia Sea, South Orkney Is, 60º36.21'S 44º19.67'W, 211 m, US AMLR 2009 stn 19–13, S. Lockhart, 13 Feb 2009, NMV F168861. Paratypes. South Orkney Is, 60º26.52'S 45º17.91'W, 497 m, US AMLR 2009 stn 12–7, 11 Feb 2009, NMV F168857 (1); NMV F168859 (5); NMV F168860 (3). Other material. South Orkney Is, 298–302 m, USNM E43073 (3); 593–598 m, USNM E43074 (2); 2355–2897 m, USNM E43076 (63); 567–671 m, USNM E43080 (3); 759–857 m, USNM E43081 (7); South Shetland Is, 300 m, USNM E43075 (3); 220–240 m, USNM E43078 (1); South Georgia, 1968–2188 m, USNM E43079 (3); Burdwood Bank, 339–357 m, USNM E43077 (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 triangular or narrow perforated ...