The Echinoid Directory

Selenechinus De Meijere in Delage and Herouard, 1903, p. 246

Diagnostic Features
  • Test circular in outline, low hemispherical in profile.
  • Apical disc hemicyclic with rather small periproct (< 50% disc diameter).
  • Ambulacral plating trigeminate, with pore-pairs in oblique arcs of three, forming wide adradial band; not expanded adorally.
  • Primary ambulacral tubercle on every second or third compound plate only, except adorally, where each plate has a tubercle. Broad perradial granular zone at ambitus.
  • Interambulacral plates with single large primary tubercle; aboral plates densely granular. On oral surface small secondary tubercles strongly developed on either side of primary.
  • Peristome small, without deep buccal notches.
  • Spines short and simple.
  • Globiferous pedicellariae with single lateral tooth, tubular blade and no neck.
Recent, Philippine Islands.
Name gender masculine
Echinus armatus de Meijere, 1902, by original designation.
Species Included
Only the type species.
Classification and/or Status

Camarodonta; Echinoida; Echinometridae.


Very similar to Sterechinus in appearance but differing from that genus in having pedicellariae with a single lateral tooth. The apical disc of Selenechinus is more compact with a smaller periproct than is typical of Sterechinus. Evechinus has less granular plating and has pore-pairs obviously aligned into vertical columns, with the inner series clearly separated from the others.

Delage, Y. & Herouard, E. 1903. Les Echinodermes. Traite de Zoologie concrete 3, i-x, 1-495, pls 1-53.