The Echinoid Directory

Evechinus Verrill, 1871, p. 583

Diagnostic Features	Test circular in outline. Apical disc hemicyclic; posterior oculars exsert; periproct relatively small. Ambulacra trigeminate, with complex compound plates. Every second or third compound plate larger than the others and bearing a primary tubercle. Pore-pairs widely spaced so that there are three incipient columns of pore-pairs in each half ambulacrum. Interambulacra with primary tubercle and flanking secondary tubercles that are almost as large; granulation poorly developed.
Distribution	Pliocene, Australia, Pleistocene to Recent of New Zealand and the Kermadec Islands.
Name gender	masculine
Type	Echinus chloroticus Valenciennes, 1846, by original designation.
Species Included	E. chloroticus (Valenciennes, 1846); Pleistocene to Recent, New Zealand; Recent, Kermadec Islands. E. palatus Philip 1969; Pliocene (Cheltenhamian); Australia.
Classification and/or Status	Camarodonta; Echinoida; Echinometridae. Presumed monophyletic.
Remarks	Distinguished from the rather similar Selenechinus by having more strongly developed secondary tubercles aborally and much less granulation. Also differs in having pore-pairs of the inner series forming a clearly separated column. Differs from Parechinus in having a primary tubercle to every second or third ambulacral plate. A fossil taxon from Australia ascribed to this genus by Philip (1969) has the triserial pattern of pore-pairs only really expressed below the ambitus. Philip, G. M. 1969. The Tertiary echinoids of south-eastern Australia IV. Camarodonta (2). Proceedings of the Royal Society of Victoria 82, 233-275, pls 3-16. Verrill, A. H. 1871. Notes on Radiata. Transactions of the Connecticut Academy 1, p. 583.