Taxonomic and Genetic Diversity in <i>Palaemon</i> Species (Decapoda: Caridea: Palaemonidae) of the Northern Gulf of Mexico
Daniel D. Fanning | Mary K. Wicksten | Anja Schulze
Grass shrimp of the genus <i>Palaemon</i> (Crustacea, Decapoda, Palaemonidae) occur worldwide in freshwater and saline wetlands. <i>Palaemon</i> species are frequently misidentified, and the genus itself has been reorganized several times. To clarify the intrageneric phylogenetic relationships and analyze the regional genetic diversity, we sequenced fragments of the mitochondrial cytochrome <i>c</i> oxidase subunit I (COI) and the nuclear Histone H3 (H3) genes from specimens collected along the northern Gulf of Mexico, where several morphologically similar <i>Palaemon</i> species reside. The generated sequences were combined with publicly available <i>Palaemon</i> sequences for phylogenetic and haplotype analyses. Our analyses indicate that the rostral formula is an unreliable character for species identification, that the Mississippi River does not act as a genetic barrier between the eastern and western populations, and that freshwater species are likely not derived from the saltwater species in the region.
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