in size near the posterior. No setae are known from the limbs. Arenosicaris is unusual among phyllocarid fossils for its preservation of limbs, if only partial. The thoracopods were likely quite fragile, hence their poor preservation. Arenosicaris's position is currently uncertain within Archaeostraca, although it may be somewhat related to the suborder Caryocaridina.

Etymology

Arenosicaris derives from arenosum, meaning "a sandy place" in reference

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