Английская Википедия:Echinocyamidae
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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
