Australian species of Psolidium Ludwig (Echinodermata: Holothuroidea: Psolidae) Author O’Loughlin, P. Mark Author Ahearn, Cynthia text Memoirs of Museum Victoria 2008 2008-12-31 65 1 22 https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-65-2008/pages-23-42/ journal article 10.24199/j.mmv.2008.65.2 1447-2554 8065020 Psolidium mccallumae sp. nov. Table 1 , Figures 3b , 7a–b Material examined . Holotype : Western Australia , off Point Cloates, upper continental slope, hard substrate, Southern Surveyor SS 10/2005 stn 139, 22.85°S 113.51°E , 100 m , 9 Dec 2005 , NMV F126891 . Description . Psolidium species up to 7 mm long (preserved); dorsal and lateral body scales thick, up to 1.3 mm wide, oral and anal cone scales tapering to projecting angled spine; dorsal and lateral tube feet conspicuous. Sole with peripheral band of tube feet, outer single series of slightly smaller tube feet, inner single series; lacking mid-ventral radial series of tube feet. Dorsal and lateral ossicles: multi-layered ossicles (scales), up to 2 tube foot canals; cups shallow, 4-8 perforations, cross and rim covered with fine spinelets, cups 40–72 μ m long; rosettes rare, small, up to 32 μ m long. Sole ossicles: smooth, irregular perforated plates, up to 16 perforations, up to 184 μ m long; shallow cups with finely spinous rim, typically 4 perforations, typically 48 μ m long; lacking rosettes. Colour (preserved) . White dorsally, laterally, ventrally. Distribution . Central Western Australia , off Point Cloates, upper continental slope, hard substrate; 100 m . Table 1, Figures 3c-d, 7e-f Etymology . Named for Anna McCallum (Marine Biology Section,Museum Victoria ) with appreciation of her participation in the collection of this material on the Southern Surveyor , and her careful curation of this holothuroid collection in Museum Victoria . Remarks . The distinctive character of Psolidium mccallumae sp. nov. is the complete cover of small spinelets on the cross and rim of the shallow dorsal cups.