The Echinoid Directory

Contributed by Philippe Nicolleau, April 2009

Smithiaster cheveti Vadet, Nicolleau & Pineau (1998, p. 55)

[Collyrites cheveti sp. nov. Vadet, Nicolleau & Pineau 1998, p. 55]

Diagnostic Features	Test low, ovate with flat base, no anterior sulcus. Ambitus rounded. Apical disc disjunct with posterior ocular plates only narrowly separated. and also a great distance above the periproct. Ambulacra all similar. Poriferous zone large. Distance between bivium and trivium short, distance between bivium and periproct great. Pore-pairs small, extending from the apex to the peristome. Peristome ovate transversally, anterior of centre. Periproct small, marginal or supra marginal. Tuberculation with fine scattered, crenulated and perforate tubercles, finely scrobiculated, set in groundmass of granules. Plastron plating protosternous.
Distribution	Middle Jurassic (Upper Callovian) France, Morocco
Classification and/or Status	Irregularia; stem group atelostomata ('disasteroids'); Collyritidae. A species of Smithiaster
Remarks	S. cheveti differs from the type species S. loryi in having a much lower test profile, its adoral surface flatter and its ambulacral pores larger. The junction between ambitus and adoral surface is angular rather than rounded. Vadet, Nicolleau & Pineau 1998. Echinides du Callovien superieur de la Sarthe et de l'Orne; II b : les echinides irreguliers- description. Memoires de la Societe Academique du Boulonnais. Serie Histoire Naturelle 19, 1-128, pls 1-40.