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Soft Sediment Brittle Stars (Biotic Group)

Component: Biotic

Unique Identifier: 1221

Biotic Setting Benthic/Attached Biota
Biotic Class Faunal Bed
Biotic Subclass Soft Sediment Fauna
Biotic Group Soft Sediment Brittle Stars
Biotic Community Amphiura Bed
Ophiothrix Bed
Ophiura Bed


Description
Definition Fine substrate assemblages dominated by crawling, burrowing or infaunal brittle stars, which are a relatively mobile class of echinoderms. Brittle stars may be either epifaunal or infaunal depending on the species and/or environmental conditions. In some situations, the central disc and several arms will be buried, but the remaining arm or arms will protrude typically ~ 1 centimeter to ~ 3 centimeters into the water column, where they may be mistaken for worms.