Echinocyamidae

Echinocyamidae is a family of sand dollars. They are found mostly off the coast of Britain and Ireland and the North Sea, with scattered populations in the tropics.[1][2][3]

Echinocyamidae
Temporal range: 9 –0 Ma Miocene to Recent
Echinocyamus pusillus
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Class:
Echinoidea
Order:
Clypeasteroida
Suborder:
Scutellina
Infraorder:
Laganiformes
Family:
Echinocyamidae

Lambert & Thiéry, 1914
Genera
  • Echinocyamus
  • †Leniechinus
  • Mortonia

Description

They are Laganiformes with:

  • simple radial internal buttresses along interambulacral margins;
  • periproct close to peristome and opening bounded by first and second paired post-basicoronal interambulacral plates
  • interambulacral zones terminating adaptively in one or two single small plates
  • basicoronal circlet small and unspecialized
  • no food grooves
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References
  1. "WoRMS - World Register of Marine Species - Echinocyamidae Lambert & Thiéry, 1914".
  2. "Echinocyamidae - Natural History Museum".
  3. GBIF. "Echinocyamidae".


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