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The Echinoid Directory

Family Phormosomatidae Mortensen, 1934, p.

Diagnosis

 Echinothurioids with:

  • primary tubercles perforate and non-crenulate
  • ambulacra with two occluded elements; pore-pairs arranged uniserially adorally with accessory plates at adradial suture
  • oral tubercles large and with sunken areoles
  • peristomial membrane with series of ambulacral plates
  • spines simple, with sac-like gland at tip of aboral spines.
Range
Recent; worldwide.
Classification and/or Status Euechinoidea, Echinothurioida
Remarks
Differentiated from Echinothuriidae by its simple oral spines lacking a hyaline hoof. Differs from Paraphormosoma in having primary elements in the triads in contact with the adradial suture and in having sunken areoles.

Mortensen, T. 1934. New Echinoidea. (Preliminary Notice.) . Videnskabelige Meddelelser fra Danks naturhistorisk Forening i Kobenhavn 98, 161-167.

Mortensen, T. 1935. A Monograph of the Echinoidea. II. Bothriocidaroida, Melonechinoida, Lepidocentroida, and Stirodonta. C. A. Reitzel, Copenhagen, 647 pp.