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Temporal range: 9 –0 Ma
Miocene to Recent
Echinocyamus pusillus.jpg
Echinocyamus pusillus
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Order: Clypeasteroida
Suborder: Scutellina
Infraorder: Laganiformes
Family: Echinocyamidae
Lambert & Thiéry, 1914

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]


The 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 adapically in one or two single small plates
  • basicoronal circlet small and unspecialized
  • no food grooves