Psolicrux iuvenilesi O'Loughin & Manjon-Cabeza, sp. nov.

• Main Authors: O'Loughlin, Mark, Manjón-Cabeza, Eugenia, Ruiz, Francina Moya
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Dendrochirotida; Cucumariidae; Psolicrux; Psolicrux iuvenilesi; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Enderby Land; Prydz Bay
• Online Access: https://doi.org/10.5281/zenodo.6219734; http://treatment.plazi.org/id/F31587C2795CFF999FDEFC2512D81391

Psolicrux iuvenilesi O’Loughin & Manjón-Cabeza sp. nov. Figure 2a–c; table 1. Material examined. Holotype. Antarctic Peninsula, Gerlache Strait, BENTART–2003, R/V Hesperides , stn PA23, 64.9255ºS, 63.6068ºW, 656 m, 25 Feb 2003, MNCN 29.04/128; dorsal body ossicles slide NMV F161522; ventral body ossicles slide F161523; tentacle ossicles slide F161524. Paratypes. Type locality and date, MNCN 29.04/129 (4). Other material. Paraiso Bay, R/V Hesperides , stn BP21, 64.90ºS, 63.01ºW, 101 m, 23 Feb 2003. Eastern Antarctica, Prydz Bay, Fram Bank, 444–453 m, 26 Feb 1991, F68053 (1); Enderby Land, 386–400, 15 Nov 1985, F84985 (1). Diagnosis. Specimens up to 29 mm long (tentacles withdrawn), widest diameter 11 mm; thin, flexible, calcareous, body wall with minute projecting spines; distinct sole and “belly” ventrally; oral cone, tapered anal cone forming distinct “tail”, both oral and anal cones frequently upturned; 10 subequal dendritic tentacles; large tube feet in mid-ventral and latero-ventral paired radial series defining a distinct sole with broad bare interradii; single latero-ventral row (of the paired series) bordering the bare interradii typically close, outer row of paired series more spaced; smaller tube feet scattered dorsally and laterally and on oral and anal cones; tube feet do not cross introvert; radial plates of calcareous ring elongate, sub-rectangular, with deep posterior notch; interradial plates elongate, tapered and rounded anteriorly, with shallow rounded indentation posteriorly. Ossicles in body wall numerous, imbricate, large, thick, single-layered, perforated, smooth plates with angled narrow distally spinous spire, plate and spire up to 480 µ m long, spires typically 160 µ m long; plates irregular in size and form; spired plates similar dorsally and ventrally; lacking small branched bluntly spinous rods and crosses. Largest tentacle ossicles irregularly oval to elongate, thick, knobbed, curved, perforated plates, up to 640 µ m long; smallest plates thin, smooth, marginally bluntly ...