The Echinoid Directory

Irenechinus Fell, 1964, p. 211

Diagnostic Features
  • Test small, hemispherical.
  • Apical disc small and dicyclic, no ring of tubercles surrounding periproct.
  • Ambulacra moderately large, trigeminate; plate comounding echinid style. Pore-pairs arranged uniserially; not expanded adorally. Each plate with a primary tubercle and small surrounding ring of miliaries with a strong radial ornament.
  • Interambulacral plates with a distinct central primary tubercle surrounded by radial ornament plus scattered secondaries and miliaries.
  • Peristome more or less flush with virtually no buccal notches.
  • Spines unknown.
Miocene, Australia.
Name gender masculine
Irenechinus hentyi Fell, 1964 [=Coptechinus pulchellus Bittner, 1892] by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Euechinoidea; Camarodonta; Temnopleuroida; Trigonocidaridae.

Monotypic. Subjective junior synonym of Ortholophus Duncan, 1887.


Philip (1969) considered the type species to be a synonym of Coptechinus pulchellus Bittner, 1892, which he placed in his genus Ortholophus.

Fell, H. B. 1964. New genera of Tertiary echinoids from Victoria, Australia. Memoirs of the National Museum of Victoria 26, 211-215.

Philip, G. M. 1969. The Tertiary echinoids of South-Eastern Australia IV. Camarodonta (2). Royal Society of Victoria Proceedings 82, 233-275, pls 3-16.