No, despite losing 95-99% of all individuals in the Caribbean to a disease in 1983-1984, the black sea urchin has never been listed as Endangered under the US Endangered Species Act.
While there is no denying their importance to the reef community, and the impact their absence had during the outbreak, marine invertebrates like urchins can only be listed on the species level, not by population or region. Without enough research to support multiple species of black sea urchin there has never been enough evidence to deem listing the Caribbean population.
Diadema antillarum
yes yes it is
The classification of a Sea Urchin is Echinoidea
sea urchin
A sea urchin does move, but not very frequently.
the colors a sea urchin could be is black olive brown purple blue and red
ummm they live in the ocean
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food
Ummm...it's the thing from which a sea urchin hatches?
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(
a blue tuxedo sea urchin
Spines of the sea urchin can cause injuries of the skin.