Echinocyamidae Explained

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

Notes and References

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