Systematics and Identification
Alpheus cylindricus is a highly derived member of the Macrocheles species group within the genus Alpheus; this species complex was recently revised, with this species limited to the eastern Pacific (Anker et al. 2008). Type locality of Alpheus cylindricus: Las Perlas, Panama (neotype) (Anker et al. 2008), types stored at the National Museum of Natural History, Smithsonian Institution (USNM). Neotype, USNM 1109158. Common name: Pacific cylinder-clawed snapping shrimp. For additional descriptions, see Kim and Abele (1988), Anker et al. (2008), Knowlton et al. (2008).