Thyonina articulata (Vaney, 1908)

Thandar, Ahmed S., 2008, Additions to the holothuroid fauna of the southern African temperate faunistic provinces, with descriptions of new species, Zootaxa 1697 (1), pp. 1-57 : 5

publication ID

https://doi.org/ 10.11646/zootaxa.1697.1.1

DOI

https://doi.org/10.5281/zenodo.5107083

persistent identifier

https://treatment.plazi.org/id/DE2087C7-F524-8742-A0AD-F63391715B68

treatment provided by

Felipe

scientific name

Thyonina articulata (Vaney, 1908)
status

 

Thyonina articulata (Vaney, 1908)

Thyone articulata Vaney, 1908a: 295 , 1908b: 426, pl. 4, figs. 43, 44.

Thyonina articulata Thandar, 1990: 217 (syn. & records), figs. 1d, 8, 10e-f.

Type Unknown , perhaps in Scotland .

Type locality Saldanha Bay , WCP .

Material examined

SAM-A27973, UCT Ecol. Surv., Van Veen, False Bay , St. FAL 419 , 34 o 12.5' S, 18 o 37' E, 15.V. 1961, 48 m GoogleMaps , 9 spec; SAM-A27974, St. FAL 434 , 34 o 15.2' S, 18 o 33.2' E, 16.v. 1961, 42 m GoogleMaps , 3 spec., SAM-A27975, St. FAL 937 , False Bay , WCP, 25.i.1967 , 19 spec.

Distribution Saldanha Bay to Port Elizabeth, 16- 162 m.

Remarks

The specimens at hand are juvenile, measuring 2.5 mm x 1.75 mm to 3 mm x 2 mm. They are barrelshaped, uniformly white, with both anal teeth and papillae. The podia are mostly in ambulacra, in 2-4 rows, with a few also in the interambulacra. The material is clearly referable to the well known southern African temperate endemic, Thyonina articulata (Vaney, 1908) but in at least two specimens smooth, four-holed plates (ca. 55 µm), first described from the anal region by Cherbonnier (1952), are also sparingly distributed in the general body wall. This is perhaps a juvenile character. The calcareous ring, despite its early stage in development, is typical as are the end-plates of the podia. However, Thandar (1990) drew attention to a sympatric, atypical form of the species, dredged from Dassen Island (west coast) at 29 m with the bottom material also described as shelly sand. They are barrel-shaped, 24-42 mm long, yellowish in colour with brownish blotches, with the calcareous ring usually consisting of a single series of interradial elements, the end-plates seldom with a complex rim and the retractors originating as 1-3 strands. Natasen Moodley (2000), on the other hand, draws attention to another sympatric, atypical form dredged from False Bay, which is U-shaped, much longer (up to 62 mm) than the typical form but with a similar complement of spicules. Regrettably these three forms must await molecular investigations.

Kingdom

Animalia

Phylum

Echinodermata

Class

Holothuroidea

Order

Dendrochirotida

Family

Phyllophoridae

Genus

Thyonina

Loc

Thyonina articulata (Vaney, 1908)

Thandar, Ahmed S. 2008
2008
Loc

Thyonina articulata

Thandar, A. S. 1990: 217
1990
Loc

Thyone articulata

Vaney, C. 1908: 295
Vaney, C. 1908: 426
1908