Clathrina ceylonensis Klautau & Valentine, 2003

Klautau, Michelle & Valentine, Clare, 2003, Revision of the genus Clathrina (Porifera, Calcarea), Zoological Journal of the Linnean Society 139 (1), pp. 1-62 : 16

CLATHRINA CEYLONENSIS ( DENDY, 1905) COMB. NOV.

Original name: Leucosolenia coriacea var. ceylonensis Dendy, 1905

Type locality: Sri Lanka .

Type: BMNH 1907.2 .1.101 (holotype /alcohol). Cheval Paar, Ceylon ( Sri Lanka). W.A. Herdman’s Ceylon Pearl Oyster Collection, 1902 .

Colour: Light yellow when preserved.

Description: Cormus massive, formed of thin, irregular and tightly anastomosed tubes, with a reticulated surface ( Fig. 10A ). According to the original description, water-collecting tubes were present.

The skeleton has no special organization, comprising equiangular and equiradiate triactines ( Fig. 10B ). Actines are conical, with blunt tips, never rounded.

Dendy described this species as a variety of C. coriacea . He noted the presence of water-collecting tubes as ‘small but prominent true oscula formed each by the coalescence of several tubes in a projection from the general surface’. He also found triactines measuring about 88 Mm/8 Mm, and ‘few very slender oxea’, which were probably trichoxeas. We studied the holotype. No trichoxeas were found, but these spicules are sometimes difficult to find. We therefore decided not to consider the presence of trichoxeas in our description. We are elevating this variety to the status of a species because C. ceylonensis is very distinct from C. coriacea . Despite morphological similarities, such as the presence of water-collecting tubes and the size of the triactines, they can easily be distinguished. C. coriacea has undulated actines with a constriction near the tip, which is rounded or blunt, while C. ceylonensis has straight actines with blunt, unrounded tips. The distribution of C. coriacea seems to be restricted to northern Europe, while C. ceylonensis occurs only in the Indian Ocean.

Figures

Figure 10. Clathrina ceylonensis. A, photograph of the holotype (¥ 10). B, triactines. Scale bar = 100 Mm.