The Echinoid Directory

Contributed by Andrew Smith, September 2006

Family Orthopsidae Duncan, 1889

Diagnosis	Regular Carinacean echinoids with: apical disc small, dicyclic; periproct rim circular; plating firmly bound to corona; ambulacra trigeminate, with all elements similar in size and extending to the perradius; pore-pairs uniserial or with every third pore-pair insert; primary tubercles perforate and non-crenulate; primary tubercles on interambulacral and ambulacral plates similar in size peristome large with shallow, but distinct, buccal notches lantern with keeled teeth and stirodont.
Range	Jurassic to Cretaceous (Maastrichtian), the Americas, Europe, North Africa, India.
Type	Orthopsis Cotteau, 1864.
Species Included	Orthopsis Cotteau, 1864, Pseuorthopsis Sanchez Roig, 1949, Parorthopsis Smith & Rader, 2009, Scaptodiadema de Loriol, 1891, Cuscuzispina Manso & Souza-Lima, 2011
Classification and/or Status	Euechinoidea, Acroechinoidea, stem group Carinacea
Remarks	Duncan, P. M. 1889. A revision of the genera and great greoups of the Echinoidea. Journal of the Linnean Society, London, Zoology Series 23, 1-311.