Echinocyamidae
| 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 | |
| |
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
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
References
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