Psolidium pawsoni O'Loughlin & Ahearn 2008, sp. nov.

• Main Authors: O'Loughlin, P. Mark, Ahearn, Cynthia
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Dendrochirotida; Psolidae; Psolidium; Psolidium pawsoni; Brunt Ice Shelf; Enderby Land; Ice Shelf; Ross Sea; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.10878582; http://treatment.plazi.org/id/03D7DF24FF8AFF9D00AEFB5E368AF8B9

Psolidium pawsoni sp. nov. Figures 2c; 7a, b Psolidium incertum .— Gutt, 1988: 1, 3, 23, 27–77.— Gutt, 1991a: 147–153.— Gutt, 1991 b: 315, 320, 324–25 (non Psolidium incertum (Théel, 1886) = Psolidium poriferum (Studer, 1876) below). Material examined . Holotype: Weddell Sea, Coats Land, Caird Coast, off Brunt Ice Shelf, USARP, R/ V Glacier , cr 2 stn 1, 74°28’06"S 30°31’42"W, 513 m, 24 Feb 1969, USNM 1112364. Paratypes: type locality and date, USNM E40798 (4); type locality and date, NMV F157430 (2). Other material: Weddell Sea, 430 m, USNM E33925 (1). Ross Sea, Tangaroa 0802, 67– 69°S 170°E- 178°W, 329–334 m, NIWA 38273 (1); 329–334 m, NIWA 38281 (1); 137–150 m, NIWA 38604 (1); 300–340 m, NIWA 38624 (6); 547–605, NIWA 39084 (12); 565–920 m, NIWA 39181 (2); 479–480 m, NIWA 39311 (6); 456–540 m, NIWA 45695 (8); 447–455 m, NIWA 45699 (1); Tangaroa 0602, stn 394, 67°S 179°E, 540–600, NIWA 44667 (5). Enderby Land, BANZARE stn 34, 66°21’S 58°50’E, 603 m, SAM K2342 (2). Diagnosis . Psolidium species up to 28 mm long; body form elongate, narrow, high; dorsal and lateral scales conspicuous, thin, smooth, up to 2.0 mm wide; dorsal and lateral tube feet inconspicuous. Sole: outer peripheral single series of smaller tube feet; inner peripheral single series of larger tube feet; lacking mid-ventral (sole) radial series of tube feet. Dorsal ossicles: multi-layered perforated plates (scales), single-layered marginally; plates frequently with smooth white thickening and reduced/small perforations aligned perpendiculartomargininparallelseries;plateswithreticulate thickening and multi-layered centrally, lacking frequent radiating linear thickenings between marginal perforations; up to 4 tube foot canals per plate; dorsal and lateral tube feet lacking support plates. Sole ossicles: throughout most of sole rare, small, smooth, thin, irregularly shaped rods and perforated plates, sometimes as regular 4-holed plates with marginal knobs or digitiform projections, sometimes surface knobs, up to 200 μ m long; near margin of sole and ...