Orthopsis miliaris, copyright Sartha.

Belongs within: Euechinoidea.

The Orthopsidae are a group of echinoids of uncertain affinities known from the Lower Jurassic to the Upper Cretaceous (Fell & Pawson 1966).

Characters (from Fell & Pawson 1966): Test small or large, regularly hemispherical or globular. Lantern camarodont (known only in Orthopsis). Ambulacra simple, without compounded plates, at most with only incipient triads; zygopores arranged in straight meridians. Tubercles perforate, noncrenulate. Apical system dicyclic, exceptionally with posterior oculars insert. Spines unknown.

Orthopsidae [Orthopsida, Orthopsina, Orthopsinae]FP66
|--Brochechinus Lambert & Thiéry 1908FP66
| `--*B. elisae Lambert & Thiéry 1908FP66
|--Gymnodiadema de Loriol 1884FP66
| `--*G. choffati de Loriol 1884FP66
|--Orthocidaris Cotteau 1862FP66
| `--*O. inermis (Gras 1848) [=Hemicidaris inermis]FP66
|--Scaptodiadema de Loriol 1891FP66
| `--*S. matheyi de Loriol 1891FP66
|--Dubarechinus Lambert 1937FP66
| |--*D. despujolsi Lambert 1937FP66
| `--D. termieri Lambert 1937SG93
`--Orthopsis Cotteau 1864 (see below for synonymy)FP66
|--*O. miliaris (d’Archiac 1835) [=Cidarites miliaris]FP66
|--O. flouesti Cotteau 1867 [=*Miorthopsis flouesti]FP66
|--O. parvituberculata (Böhm 1884)SG93
|--O. perlata Noetling 1897SG93
|--O. sanfilippoi Checchia-Rispoli 1933SG93
`--O. similis Stoliczka 1873 [=*Arialopsis similis, *Stephanopsis similis, *Stephomma simile]FP66

Orthopsis Cotteau 1864 [incl. Arialopsis Lambert & Thiéry 1925, Miorthopsis Pomel 1883, Stephanopsis Lambert 1900 non Bedot 1896, Stephomma Stechow 1921]FP66

*Type species of generic name indicated


[FP66] Fell, H. B., & D. L. Pawson. 1966. Echinacea. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt U. Echinodermata 3 vol. 2 pp. U367–U440. The Geological Society of America, Inc., and The University of Kansas Press.

[SG93] Simms, M. J., A. S. Gale, P. Gilliland, E. P. F. Rose & G. D. Sevastopulo. 1993. Echinodermata. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 491–528. Chapman & Hall: London.

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