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Sand Dollar Bed (Biotic Group)

Component: Biotic

Unique Identifier: 535

Biotic Setting Benthic/Attached Biota
Biotic Class Faunal Bed
Biotic Subclass Soft Sediment Fauna
Biotic Group Sand Dollar Bed
Biotic Community Clypeaster Bed
Mellita Bed
Dendaster elongatus Bed

Definition Assemblages dominated by surface-dwelling, "irregular" echinoids of the Phylum Echinodermata and Order Clypeasteroida (e.g., sand dollars, sea biscuits). Sand dollars typically move on top of the sediment surface or burrow in the top few centimeters of sediment. Sand dollars are characterized by a flat body and short spines, to visually distinguish them from Burrowing Urchins and Soft Sediment Sea Urchins (see biotic groups below). Most sand dollars are deposit feeders; some are suspension feeders.