Psolidium mccallumae, O’Loughlin & Ahearn, 2008

O’Loughlin, P. Mark & Ahearn, Cynthia, 2008, Australian species of Psolidium Ludwig (Echinodermata: Holothuroidea: Psolidae), Memoirs of Museum Victoria 65, pp. 1-22 : 16

publication ID	https://doi.org/10.24199/j.mmv.2008.65.2
DOI	https://doi.org/10.5281/zenodo.8070640
persistent identifier	https://treatment.plazi.org/id/03FC87C9-5617-FFAD-A2AD-FE23FE6CF1E3
treatment provided by	Felipe (2023-06-21 13:59:15, last updated 2025-04-04 02:54:49)
scientific name	Psolidium mccallumae
status	sp. nov.

Treatment

Psolidium mccallumae View in CoL sp. nov.

Table 1 View Table 1 , Figures 3b View Figure 3 , 7a–b View Figure 7

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 About NMV . GoogleMaps

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.

Figures

Figure 3. Photos of preserved specimens of Psolidium Ludwig, 1886 (by L. Altoff): a, P. marshae sp. nov., Geographe Bay, Western Australia (dorsal view; 8 mm long; holotype WAM Z31173); b, P. mccallumae sp. nov., slope off Point Cloates, Western Australia (lateral view; 7 mm long; holotype NMV F126891); c–d, P. nigrescens H. L. Clark, 1938, Gunnamatta Bay, New South Wales (40 mm long; AM J6821); c, lateral view; d, ventral view (sole); e–f, P. parmatus (Sluiter, 1901), Adele slope, Western Australia (9 mm long; NMV F151835); e, lateral view; f, ventral view (sole).

Figure 7. Photos of ossicles from Australian species of Psolidium Ludwig, 1886 (by Mark O’Loughlin and Chris Rowley): a–b, P. mccallumae sp. nov. (holotype NMV F126891); a, dorsal cups; b, mount of part of sole body wall, with plates and cups; c–d, P. minutus (H. L. Clark, 1938) (NMV F93176); c, dorsal large cup and small cupped crosses; d, large cup and small cupped crosses from sole; e–f, P. nigrescens H. L. Clark, 1938 (AM J6821); e, knobbed plates from sole; f, tentacle “thorns” and rosettes.