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Schultz, M. B., Smith, S. A., Richardson, A. M. M., Horwitz, P., Crandall, K. A. & Austin, C. M. (2007). Cryptic diversity in Engaeus Erichson, Geocharax Clark and Gramastacus Riek (Decapoda : Parastacidae) revealed by mitochondrial 16S rDNA sequences. Invertebrate Systematics. 21(6): 569.