The Echinoid Directory

Toxocidaris A. Agassiz 1863, p. 22

Diagnostic Features	Test circular in outline; depressed in profile Apical disc hemicyclic with ocular plates I and V usually insert Ambulacra polygeminate with 6-8 pore-pairs to a compound plate, arranged in an arc; arcs separated by row of small tubercles. One primary tubercle to each plate. Ambulacra not expanding orally to form phyllodes but narrow slightly Interambulacral plates with primary tubercle flanked by much smaller secondary tubercles. Primary tubercles prominent especially aborally Spines no more than half the test diameter Globiferous pedicellariae with single lateral tooth and no neck
Distribution	Recent of Australia and New Zealand
Name gender	feminine
Type	Toxopneustes delalandi Agassiz & Desor, 1846, p. 367 (=Echinus erythrogrammus Valenciennes, 1846) by original designation
Species Included	Only the type species
Classification and/or Status	Camarodonta; Echinoida; Echinometridae Monotypic. Treated here as a subjective junior synonym of Heliocidaris
Remarks	Mortensen (1943, p. 337) , although placing Toxocidaris erythrogramma in the genus Heliocidaris, noted that the two differed significantly and were possibly not congeneric. H. tuberculatus differs from T. erythrogramma in having adoral ambulacra more strongly petaloid and it has a very different development. Agassiz, A. 1863. Bull. Mus. Comp. Zool, Harvard College 1, p. 22