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The Echinoid Directory

Stem group Stem group atelostomates (disasteroids)

[=Disasteroida of Mintz, 1968, p. 1287]

Diagnosis	Irregular echinoids with: elongate, usually disjunct apical disc, the posterior oculars separated from the remainder of the disc and plates of interambulacra 1 and 4 meeting along the aboral midline plastron plating protosternous.
Range	Lower Jurassic (?Pleinsbachian, Toarcian) to Lower Cretaceous (Albian); Europe, North Africa, India.

Diagnosis

Irregular echinoids with:

elongate, usually disjunct apical disc, the posterior oculars separated from the remainder of the disc and plates of interambulacra 1 and 4 meeting along the aboral midline
plastron plating protosternous.

Range

Lower Jurassic (?Pleinsbachian, Toarcian) to Lower Cretaceous (Albian); Europe, North Africa, India.