Hippasteria Sea Star

Hippasteria Sea Star (likely Hippasteria californica)

An orange sea star (likely Hippasteria californica) crawling over a clam bed at Southern Hydrate Ridge. Credit: UW/NSF-OOI/CSSF, Dive R2228, V22.

Hippasteria is a genus of sea star in the family Goniasteridae (which is very diverse), mainly found in the deep sea. These sea stars have five arms, a large, flattened central disc, and are known to be coral/cnidarian predators.

This individual, seen at Hydrate Ridge, was tentatively identified (based on the marginals) by Chris Mah, of the Smithsonian National Museum of Natural History.

Mah, C., Neill, K., Eléaume, M. and Foltz, D. (2014), Hippasteria revision. Zool J Linn Soc, 171: 422-456. https://doi.org/10.1111/zoj.12131