The Taxonomic Relations of the Atyidae (Decapoda: Caridea) of Sri Lanka Determined by Electrophoretically Detectable Protein Variation

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Abstract
Electrophoretic variation at 29 loci in 7 spp. and 2 sspp. of Sri Lankan atyid prawns (Caridina spp. and Atya sp.) was determined for samples of 12-24 individuals. Each species pair showed several fixed gene differences, and Nei''s genetic distances of 0.279-1.748. The subspecies C. nilotica simoni and C. n. zeylanica showed no fixed gene differences and Nei''s genetic distances of intraspecific interpopulation level (0.039). C. n. zeylanica is only a population variant of C. n. simoni. A cladistic analysis using A. spinipes as an out-group showed the genus Caridina in Sri Lanka to have 2 lineages, both of which have given rise to endemic species. On the basis of distributional data, C. singhalensis, an endemic related to C. nilotica, C. gracilirostris and C. typus, probably arose from an earlier colonization and speciation cycle than C. pristis, an endemic allied to C. fernandoi (also endemic).

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