Psolidium whittakeri 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 whittakeri; Icefish; Scotia Sea
• Online Access: https://doi.org/10.5281/zenodo.10666009; http://treatment.plazi.org/id/03D7DF24FF8EFF86030CF95D36C8FCE8

Psolidium whittakeri sp. nov. Figures 3b-d; 8d-f Psolidium incertum .— Ludwig and Heding, 1935: 162–64, text figs 28–29 (non Psolidium incertum (Théel, 1886) = P. poriferum (Studer, 1876) (above). Material examined . Holotype: Scotia Sea, South Sandwich Is, Saunders I., 57°39’24"S 26°26’42"W, 415–613 m, R/ V Islas Orcadas , USARP cr 575 stn 52, 26 May 1975, USNM 1112365. Paratypes: type locality and date, USNM E40795 (39 specimens); NMV F157431 (6). Other material: South Sandwich Is, 146–527 m, USNM E40817 (1); 355-468 m, E40818 (1); 302–375 m, E40819 (2); 360–486 m, E40827 (2); 452–759 m, E40828 (1). Bouvet I., Icefish 2004 stn 59, 408–656 m, NMV F104857 (3); stn 71, 193–207 m, F104867 (1); stn 73, 316 m, F104896 (1); stn 76, 650–646 m, F104837 (7) South Shetland Is., Elephant I., 326–382 m, AMLR-03 stn 38, NMV F104849 (1); Deception I., 460–484 m, AMLR-03 stn 88, F104834 (3); F104835 (1). Diagnosis . Psolidium species up to 42 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, multi-layered centrally; reticulate thickenings extend from near margin towards centre of plate, thickenings near margin sometimes parallel to edge of plate, sometimes coalesce into smooth thickenings with smaller perforations, lacking frequent radiating linear thickenings between marginal perforations; up to 4 tube foot canals or marginal indentations per plate; dorsal and lateral tube feet lack support ossicles. Sole ossicles: throughout sole rare, small, smooth, thin, irregularly shaped rods and perforated plates, 0–9 large perforations, bluntly spined around margin, sometimes surface knobs, up to 260 μ m long; sometimes as regular 4-holed plates with bluntly spined margin, ...