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Feeding Structures of Two Atyid Shrimps, with Comments on Caridean Phylogeny

Bruce E. Felgenhauer and Lawrence G. Abele
Journal of Crustacean Biology
Vol. 5, No. 3 (Aug., 1985), pp. 397-419
Published by: on behalf of The Crustacean Society
DOI: 10.2307/1547911
Stable URL: http://www.jstor.org/stable/1547911
Page Count: 23
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Feeding Structures of Two Atyid Shrimps, with Comments on Caridean Phylogeny
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Abstract

Atya innocous and Potimirim glabra (Atyidae) occur in permanent and temporary fresh-water streams in the Atlantic and Pacific drainages of Panamá. Their mouthparts, mandibles, and foreguts are compared to test the hypothesis that these structures are related to diet. Atya innocous occurs in moderate to fast-flowing streams, feeding on minute particles collected from the water column or bottom. Potimirim glabra inhabits quiet pools, scraping periphyton from leaf surfaces and decaying organic detritus. The feeding appendages of both species are modified for handling fine particles of food. The mandibles have a strong incisor process but are not used for crushing large food items. The primitive nature of the mandible and foregut suggests the placement of the family Atyidae at the base of the caridean evolutionary tree. The use of the foregut in the construction of phylogenies within the Decapoda is discussed.

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