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: Miocene to Recent | |
|---|---|
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| Echinocyamus pusillus | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | |
| Suborder: | Scutellina |
| Infraorder: | Laganiformes |
| Family: | Echinocyamidae Lambert & Thiéry, 1914 |
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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
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