[=Ellipsechinus Lutken, 1864, p. 165, type species Ellipsechinus macrostomus Lutken, 1864 (=Echinometra vanbrunti A. Agassiz, 1863); = Mortensenia Doderlein, 1906, p. 233, type species Echinus oblonga de Blainville, 1825(=Echinometra mathaei (Blainville, 1825)); ?Ellipsocidaris Pomel, 1869; type unknown.]
Early Miocene to Recent; France, North Africa and the Mediterranean, tropical Atlantic and Indo-Pacific.
Echinus lucunter Linnaeus, 1758, p. 665, by original designation.
|Classification and/or Status||
The characteristic ovate shape and oblique axis distinguish Echinometra from most other echinid genera. Parasalenia also has an ovate test, but its long axis passes through ocular plate III and genital plate 5. Colobocentrotus, Podophora and Heterocentrotus all have similarly ovate tests, but they are distinguished by having short peg-like aboral secondary spines as opposed to the long, pointed spines of Echinometra, and more massive and typically flattened or facetted primary spines. 'Echinometra' prisca Cotteau has trigeminate ambulacra and an unknown axis of elongation, and is here retained in its own genus, Plagiechinus.