[=Cyphosominae Lambert, 1897, p. 498; includes Trochalosomina Lambert, 1897, p. 515. ]
Diagnosis | Phymosomatoida with:
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Range | Upper Jurassic - Eocene, Europe, North America, Middle East, North Africa. |
Type | Phymosoma |
Classification and/or Status | Acroechinoidea, Calycina, Phymosomatoida |
Remarks | Closely resembling Emiratiidae in apical disc morphology, but with imperforate tubercles, and phymosomatid-style plate compounding. Members of an unnamed clade have imperforate tubercles that are non-crenulate, and diadematid rather than phymosomatid plate compounding. Possibly paraphyletic by exclusion of Glyptocidaris. |