These bottom-dwelling echinoderms have a central disc body ... of popular starfish is challenging because there are so many species to choose from — over 2,000 different species, to be precise.

But it actually belongs to the phylum of echinoderms, closely related to starfish (aka sea stars), sand dollars, sea urchins and sea lilies. Many sea cucumber species can be found in a variety of ...

There are around 800 extant species and the group has a long and detailed fossil record stretching back about 450 million years ago to the Late Ordovician Period. They belong to the Echinoidea, one of ...

Like many other echinoderms, brittle stars can regenerate their limbs ... the team looked at the genes expressed during regeneration across distantly related species. They compared their brittle star ...