The Echinoid Directory

Asterechinus Mortensen, 1942, p. 288

[=Tatechinus Philip, 1969, p. 268, type species Tatechinus woodsi Philip, 1969]

Diagnostic Features
  • Test small, low domal in profile.
  • Apical disc moderately large, plating dicyclic with small projecting ocular plates. Periproct large, subcircular, with small but distinct suranal. A ring of tubercles on the genital plates surrounds the periproct.
  • Ambulacral zones straight, a little more than half the interambulacral width. Plating trigeminate, compound in echinid style. Pore-pairs weakly offset in triads, and hardly more crowded adorally. Single primary tubercle to each compound plate adjacent to pore zone, plus scattered miliaries.
  • Interambulacral plates with central primary tubercle and rather sparse secondaries and granules; the secondaries with a radial epistroma.
  • No pits or other epistromal ornament.
  • Primary tubercles imperforate and distinctly crenulate and with an incised (indented) areole.
  • Peristome with very feeble buccal notches.
  • Spines short and without cortex.
  • Perignathic girdle with auricles fused above the perradius.
Upper Eocene to Recent; Australia, Indonesia.
Name gender masculine
Asterechinus elegans Mortensen, 1942, p. 288, by original designation.
Species Included
  • A. elegans Mortensen, 1942; Recent, Indonesia (Admiralty Islands).
  • A. nudus (Philip, 1969); Upper Eocene, Australia.
Classification and/or Status
Euechinoidea; Camarodonta; Temnopleuroida; Trigonocidaridae.


Mortensen, T. 1943. A monograph of the Echinoidea Part III.2, Camarodonta 1. C. A. Reitzel, Copenhagen.