Psolidium acorbulum Thandar, 2006

Thandar, Ahmed S., 2018, On some miscellaneous sea cucumbers (Echinodermata: Holothuroidea) in the collections of the South African Museum with three new species, Zootaxa 4532 (1), pp. 57-85 : 78-79

publication ID

https://doi.org/ 10.11646/zootaxa.4532.1.3

publication LSID

lsid:zoobank.org:pub:A6128B92-0B20-4D4D-AE8B-483D39BB2C04

DOI

https://doi.org/10.5281/zenodo.3511235

persistent identifier

https://treatment.plazi.org/id/2A0887A5-990A-5E34-BCF8-FE72FE75FD7E

treatment provided by

Plazi

scientific name

Psolidium acorbulum Thandar, 2006
status

 

Psolidium acorbulum Thandar, 2006 View in CoL

( Figure 16 View FIGURE 16 )

Psolidium acorbulum Thandar, 2006: 39 View in CoL View Cited Treatment , fig.13.

Samyn & VandenSpiegel, 2016:487, text-fig. 27. Diagnosis (see Thandar 2006)

Material examined. SAMC-A 090927 , SM 123, off south of Scottburgh , 30°33.04’ S, 30°48.06’ E, heavy dredge, 690 m, 10.V.1977, 1 spec GoogleMaps .

Description. Form typically psolid with an arched dorsal surface and flattened ventral surface forming the sole which is largely covered by ventral flaps of the body wall; sole thin-walled, membranous. Specimen length about 2.5 mm, width in mid-body just over 1 mm. Colour off-white in alcohol. Dorsal scales overlapping, not possible to determine the number of scales between mouth and anus as latter two not apparent. Dorsal tube feet in three conspicuous rows, but few also in inter-ambulacra. A single row of tube feet present on margin of sole. Tube feet emit from between scales and not through them. Tentacle number undetermined, tentacles simple (digitate) or very finely branched. Internal anatomy typical of species, form and size of ossicles as in type. Dorsal plates ( Figure 16A View FIGURE 16 ) include large type, up to 335 µm and small type, up to 70 µm, all with about 10 holes. Ventral plates ( Figure 16B View FIGURE 16 ) much smaller, larger ones up to 240 µm, and smaller ones up to 135 µm, all with up to 10 holes, usually fewer. Tube feet deposits comprise minute perforated plates ( Figure 16C View FIGURE 16 ), larger ones up to 350 µm, smaller ones up to 90 µm; end-plates present, up to 100 µm, with numerous holes.

Distribution. East coast of South Africa, from Scottburgh to East London, 690–775 m, perhaps extending to N. Mozambique.

Remarks. This species was originally based on two specimens collected from off Port St. Johns and East London area on the east coast of South Africa. Now, its occurrence north of Port St. Johns is a noteworthy extension of its range. This species was described by Thandar (2006) and therefore only a few pertinent features are recorded above. The knobs on the plates are not as prominent as in the type. It is also difficult to determine the tentacle number and form. Simple tentacles were described for the type where as in the current specimen some tentacles appear minutely branched. Despite this there is no doubt as to the specific identity of the current material. As in the type the form is exactly psolid-like and the mouth and anus not distinguishable as they are both covered by overlapping scales.

SM

Sarawak Museum

Kingdom

Animalia

Phylum

Echinodermata

Class

Holothuroidea

Order

Dendrochirotida

Family

Psolidae

Genus

Psolidium

Loc

Psolidium acorbulum Thandar, 2006

Thandar, Ahmed S. 2018
2018
Loc

Psolidium acorbulum

Thandar, A. S. 2006: 39
2006
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