The Echinoid Directory

Family Pseudodiadematidae Pomel, 1883, p. 100

Diagnosis	Carinacea with: apical disc small and dicyclic; pore-pairs uniserial at ambitus and adapically; ambulacral plate compounding diadematid primary tubercles perforate and crenulate.
Range	Upper Triassic to Lower Cretaceous, Europe, Middle East, India.
Type	Pseudodiadema
Classification and/or Status	Euechinoidea, Acroechinoidea, Carinacea
Remarks	Distinguished from Hemicidaridae by having ambulacral and interambulacral tubercles more or less similar in size. Distinguished from Emiratiidae by having a small dicyclic apical disc with no intercalated periproctal plates. Distinguished from Phymosomatidae by having perforate tubercles and simple ambulacral compounding, with all elements reaching the perradius. Most of the taxa included in this family in the Treatise by Fell & Pawson (1966) are here removed to other families. Pomel, A. 1883. Classification méthodique et Genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles 503, Aldolphe Jourdan, Alger, 131 pp. Fell, H. B. & Pawson, D. L. 1966. Echinacea. Pp. U367-440. In Moore R. C. (ed.) Treatise on Invertebrate Paleontology, part U. Echinodermata 3. The Geological Society of America/The University of Kansas Press, Boulder/Lawrence.