Gracilechinus
Gracilechinus is a genus of sea urchins in the family Echinidae.
Description and characteristics
The species in this genus are regular sea urchins, with a rounded test, bearing the anus at the top and the mouth at the bottom. They are extremely similar to species in the genus Echinus, but are differentiated by a primary tubercle on every interambulacral plate.Most species in this genus are abyssal, and live in the North Atlantic or close cold seas.
Species
Species in this genus include:| Image | Scientific name | Distribution |
| Gracilechinus acutus | Europe | |
| Gracilechinus affinis | center Atlantic | |
| Gracilechinus alexandri | Northern Atlantic | |
| Gracilechinus atlanticus | Atlantic | |
| Gracilechinus elegans | North-east Atlantic | |
| Gracilechinus gracilis | Caribbean | |
| Gracilechinus lucidus | North-west Pacific | |
| Gracilechinus stenoporus | South Africa |
Image:Gracilechinus acutus test.JPG|thumb|center|upright=1.3|Test of a ''Gracilechinus acutus''