Psolidium incubans Ekman 1925

• 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 incubans; Antarc*; Antarctic
• Online Access: https://doi.org/10.5281/zenodo.10878570; http://treatment.plazi.org/id/03D7DF24FF8BFF9C0314FE5C31C8FA91

Psolidium incubans Ekman, 1925 Figures 1f; 4f Psolidium incubans Ekman, 1925: 5, 113–116, text fig. 27.— Arnaud, 1974: 584. — Gutt, 1988: 73. Material examined . South Georgia, Discovery stn MS67, E Cumberland Bay, 38 m, 28 Feb 1926, BM(NH) 2008.3190 (1 specimen). Diagnosis . Psolidium species up to 12 mm long; wrinkled body surface, created by high cups; dorsal and lateral scales not conspicuous; dorsal and lateral tube feet conspicuous. Sole: outer peripheral single series of smaller tube feet; inner peripheral single to zig-zag to double series of larger tube feet; lacking mid-ventral (sole) radial series of tube feet; sole soft, with folds for brood-protection. Dorsal ossicles: perforated plates with anastomosing secondary developments and multi-layering (scales), up to 700 μ m long, 0–2 tube foot canals per scale; shallow cups with 2 large central and 2 smaller end perforations, marginal knobs, cups 90 μ m long; deep goblet-like cups closed across rim, vertical blunt spines above rim, cups 70–90 μ m wide, 80–110 μ m high. Sole ossicles: shallow cupped crosses, shallow cups with small marginal knobs, cups 80 μ m long; shallow concave perforated plates, upturned marginal knobs, up to 14 perforations, plates up to 150 μ m long. Distribution. South Georgia, Cumberland Bay; 12– 38 m. Remarks . As noted by Ekman (1925) this small species of Psolidium brood-protects in folds of the sole. Published as part of O'Loughlin, P. Mark & Ahearn, Cynthia, 2008, Antarctic and Sub-Antarctic species of Psolidium Ludwig (Echinodermata: Holothuroidea: Psolidae), pp. 23-42 in Memoirs of Museum Victoria 65 on page 33, DOI:10.24199/j.mmv.2008.65.2, http://zenodo.org/record/10665899