WoRMS taxon details
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Diagnosis Test flattened above and below, the sides arched, ambitus rounded, apical system ca. half h.d., peristome one third h.d. Ambulacra weakly sinuate, ca. 16% IA. At the ambitus about seven amb plates occur opposite an IA plate. Interporiferous area 3–4 times broader than the poriferous area. Pores oblique. Marginal tubercles in vertical linear series. Internal tubercles 2 or 3 to each plate, in more or less vertical linear series. The median area is sunken, completely naked, and forms a conspicuous, vertical furrow, weakly sinuous but not following a zig-zag course, and with no abrupt changes in its width from plate to plate. About 7 IA plates. Primaries cylindrical, slender, developing a wide distal disc in the case of the adapical radioles; the disc is somewhat excentric, the adapical side being larger. In the adult, a fully-formed disc is almost as large as the apical area, and about 15 to 20 such discs may be present, forming a complete shielding system over the aboral surface. Oral primaries more or less spearhead-shaped, with lateral teeth sometimes evident near the base. [details]
Type locality Station 34 (130 fathoms), Chatham Islands Expedition 1954 [details]
Type material HT: Canterbury Museum, Christchurch (H.d. 27 mm, ht. 17 mm; pl. 5: fig. b; one out of a lot of five specimens) [no specimen numbers given] [details]
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