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Deep-Sea Echinoderms of New Zealand

Cosmasterias Sladen, 1889

Cosmasterias Sladen, 1889

The genus is new to the fauna, but proves to be represented by the same species as in Australia. A diagnosis follows:

Abactinal plates forming more or less well-defined longitudinal series. Actinal plates in two or more series, not overhung by spines of the inferomarginals. Adambulacral plates diplacanthid. Large, straight, unguiculate (felipedal) pedicellariae present.

Cosmasterias dyscrita H. L. Clark. Plate 2, Figs. D, E. H.
  • Clark, H. L., 1916. Endeavour Rpt., Dept. of Trade, Customs, Fisheries, N.S.W., 4, p. 71–2, Pl. 29, figs. 1–2.

Material Examined: Fragments of about 3 individuals, from 130 fathoms, Station 34, Chatham Islands Expedition.

Remarks: The holotype of this species was taken by the Endeavour in 200 fathoms, south of Gabo Island, Victoria, and until now no other specimen was known. As Clark has given only photographic illustrations of the whole animal, I am obliged to rely entirely upon his careful description in making the identification. The oral plates (Fig. H) carry four spines, namely an inner and an outer furrow-spine and a proximal and distal sub-oral spine. Small pedicellariae and large unguiculate pedicellariae occur on or beside these plates. The characteristic appearance of the unguiculate (or felipedal, as Verrill and Clark term it) pedicellaria is shown in Fig. D. The armature of the adambulacral plates is illustrated in Fig. E, occasional unguiculate pedicellariae occurring on the furrow margin. Smaller crossed pedicellariae are scattered among the spines. The actinolateral series carry either one or two prominent, coarse spines.