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]

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

References

  1. ^ "WoRMS - World Register of Marine Species - Echinocyamidae Lambert & Thiéry, 1914".
  2. ^ "Echinocyamidae - Natural History Museum".
  3. ^ GBIF. "Echinocyamidae".