Amphilepidida

Hemieuryalidae is a family of echinoderms belonging to the order Amphilepidida.

Amphilepidida is an order of echinoderms belonging to the class Ophiuroidea.

Ophiolepididae are a family of brittle stars. It includes both deep-sea and shallow-water species.

Ophioplocus is a genus of brittle stars in the family Hemieuryalidae. The genus was first described by Thomas Lyman in 1861.

species of echinoderm

Amphilimnidae is a family of echinoderms belonging to the order Amphilepidida.

species of echinoderm

Ophiomusa is a genus of echinoderms, which includes sea urchins, sand dollars and sea cucumbers, belonging to the family Ophiolepididae. Ophiurida are similar to starfish; they both have a central disc and five arms sprouting from the disc. One of the main distinguishing factors of an Ophiuroid is its arms; the arms of an Ophiurida are longer, thinner, and distinctly separated in comparison to those of a sea star.