The Echinoid Directory

Elipneustes Koehler, 1914, p. 213

[=Eurypneutes Koehler, 1914a, p. 71 (non Duncan & Sladen, 1882) ]

Diagnostic Features
  • Test ovate with faint anterior sulcus; base flat and depressed in profile with short truncate posterior face. Thin-plated.
  • Apical disc ethmolytic with four gonopores; anterior of centre.
  • Anterior ambulacrum flush and narrow aborally, with small steeply oblique pore-pairs.
  • Paired ambulacra petaloid; petals long, parallel-sided with wide interporal zone and open distally without occluded plates. Petals extend to ambitus. Pore-pairs conjugate.
  • Peristome D-shaped and slightly depressed but downward-facing.
  • Labral plate longitudinally elongate; wedge-shaped; extending to third or fourth ambulacral plate. Sternal plates paired, short and triangular; fully tuberculate. Episternal plates paired and strongly tapered posteriorly (indented by ambulacral plate 6).
  • Periproct on posterior truncate face; slightly wider than tall.
  • Subanal fasciole present enclosing three subanal tube-feet.
  • Thin peripetalous fasciole present, not indented interradially.
  • Scattered primary tubercles over the aboral surface in all interambulacral zones.
Recent, Indian Ocean.
Name gender feminine
Eurypneustes denudatus Koehler, 1914, p. 71, by original designation.
Species Included
  • E. denudatus (Koehler, 1914); Recent, Ceylon.
  • E. rubens (Koehler, 1914); Recent, Ceylon.
Classification and/or Status

Spatangoida, Micrasterina, unnamed taxon 2.

Probably monophyletic.


Closely related to Linopneustes and Eurypatagus, sharing with those taxa its long open petals and distinctive plastron structure. It differs from Linopneustes in lacking a frontal groove and in having somewhat more strongly conjugate pore-pairs. It is distinguished from Eurypatagus by the presence of a peripetalous fasciole.

Name proposed as a replacement for Eurypneustes Koehler, non Duncan & Sladen, 1882.

Koehler, R. 1914. Change of name in an Indian genus of Echinoidea. Records of the Indian Museum 10, p. 213.

Mortensen, T. 1950. A monograph of the Echinoidea. V. Spatangoida 1. C. A. Reitzel, Copenhagen.