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
| |
|---|---|
| |
| Echinocyamus pusillus | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | |
| Suborder: | |
| Infraorder: | |
| Family: | Echinocyamidae Lambert & Thiéry, 1914
|
| Genera | |
Description edit
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 edit
 | This article about a sea urchin is a stub. You can help Wikipedia by expanding it. |