A crustacean is a member of the arthropod group that includes crabs, shrimps and many small aquatic forms. Different appendages can support swimming, feeding and respiration. Familiar large-bodied examples represent only part of the group’s diversity.
A genus of snapping shrimp. Comparisons of related Alpheus lineages separated by the Isthmus of Panama have been used to study geographical isolation and allopatric speciation; inferred separation times vary among pairs.
A small bivalved crustacean. Sexually dimorphic fossil carapaces can provide indirect evidence about reproductive investment.

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