Psolidium schnabelae 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 schnabelae; Antarc*; Antarctica; MacRobertson Land; Prydz Bay
• Online Access: https://doi.org/10.5281/zenodo.10878586; http://treatment.plazi.org/id/03D7DF24FF8DFF990314FC793797FC61

Psolidium schnabelae sp. nov. Figures 3a; 8 a-c Material examined . Holotype: Eastern Antarctica, MacRobertson Land, slope off Prydz Bay, BANZARE stn 29, 66°28’S 72°41’E, 1266 m, 25 Dec 1929, SAM K2345. Other material: type locality and date, SAM K2346 (2). Diagnosis . Psolidium species up to 25 mm long; body form elongate, high; dorsal and lateral scales conspicuous, thin, smooth, up to 2.5 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, reticulate thickenings extend from margin towards centre of plate, multi-layered centrally, lacking frequent radiating linear thickenings between marginal perforations, lacking smooth white thickening with small perforations, margin with irregular thickenings and perforations, not smooth; up to 4 tube foot canals or marginal indentations per plate; small mesh-like tube foot endplates, about 5 perforations, 40 μ m wide; lacking dorsal and lateral tube foot support plates. Sole ossicles: throughout sole rare, small, smooth, thin, irregularly shaped rods and perforated plates, up to 10 perforations, up to 240 μ m long, sometimes as regular 4-holed plates with bluntly spined margin, sometimes surface knobs, up to 180 μ m long; near margin of sole and peripheral tube feet thicker irregular rod-plates and very thick irregular perforated plates, up to 300 μ m long. Tentacles: largest tentacle trunk ossicles predominantly smooth perforated plates, irregularly oval, large central perforations grading to numerous small close ones near margin, finely denticulate margin, plates up to 520 μ m long; some thicker plates with large perforations, plates up to 300 μ m long; few rod-plates, up to 300 μ m long. Colour (preserved) . Body pale brown to off-white; scales haloed, with pale outer edge (single-layer perforated edge of scales with ...