Stolus sp.

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 : 3-5

publication ID

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

persistent identifier

https://treatment.plazi.org/id/DE2087C7-F522-8742-A0AD-F1D4928D5D42

treatment provided by

Felipe

scientific name

Stolus sp.
status

 

Stolus sp. indet.

Figure 1 View FIGURE 1

Material examined

SAM-A27972, UCT Ecol. Surv., Van Veen, St. WCD 114 , off Saldanha Bay , WCP, 33º 6.5' S, 17º 32.9' E, 3.vii. 1961, 273 m, 1 spec. GoogleMaps

Description

Specimen 16 mm long, 5 mm wide in mid-body. Colour uniformly yellowish-white, podia of same colouration. Mouth and anus terminal. Tentacles retracted, of same colouration as body wall, eight large, wellbranched, of unequal length, dorsal ones larger, mid-ventral two considerably reduced. No anal teeth or any special anal papillae detected. Podia numerous, papilliform, scattered, evenly distributed in ambulacra and interambulacra, suckers small, of same diameter as podia.

Calcareous ring ( Figure 1E View FIGURE 1 ) poorly calcified, tubular, exceptionally long (11 mm), reaching posterior third of body, sub-divided into a mosaic. Polian vesicle single, considerably elongate, reaching level of cloaca; stone canal ( Figure 1D View FIGURE 1 ) short, straight, madreporite pyriform. Most of gut lost, perhaps due to previous dissection, stomach highly muscular, gizzard-like. Respiratory trees well branched, right one reaching extreme anterior end, left one only anterior third of body but more profusely branched, both trees arising from common stem. Gonad immature, comprising two tufts of short, unbranched, whitish tubules attached in mid-body. Retractor muscles thin, arising from longitudinal bands in mid-body, more anteriorly in ventral ambulacra. Cloaca elongate.

Spicules of body wall sparse, comprising simple, single-layered, large-knobbed oval to irregular plates, 90- 96 µm, with 5-6 holes, mostly restricted to anal region ( Figure 1A View FIGURE 1 ). Podia without deposits, end-plates also absent. Introvert deposits scarce, comprising large-knobbed plates ( Figure 1B View FIGURE 1 ), up to 104 µm, lacking in distal part of introvert, scarce elsewhere. Tentacle stalk and tips comprising delicate, smooth, multilocular plates, of varying shapes and sizes, 54-113 µm ( Figure 1C View FIGURE 1 ).

Distribution West coast of S.A., 273 m. Remarks

The single specimen perhaps represents a new species but because of its immaturity, poor calcification of the calcareous ring and the scarcity of spicules, it is here not treated as such. No species of Stolus has yet been described with such a scarcity of spicules but this may be due to the immaturity of the material. Thandar (2005) provides a key to the 13 nominal species currently classified in the genus but the present material is not referable to any of these.