Bahadzia setodactylus Holsinger, 1992
Taxonomic Characterization: Relatively large amphipod lacking eyes and pigment. Clearly distinguishable from all other species in the genus by reduced lacinia mobilis of right mandible (reduced to a single tooth), more palmar margin spines on male gnathopod 2, elongate and heavily setose dactyl of pereopod 6, reduced number of spines on peduncle of uropod 3, and fewer spines on telson (Holsinger, 1992). A key to the genus is presented in Jaume & Wagner, 1998.
Disposition of Specimens: National Museum of Natural History, Smithsonian Institution catalog number USNM 239476; Zo÷logisch Museum, Amsterdam; and in the private collection of John Holsinger.
Ecological Classification: Anchialine stygobitic
Size: Males to 9.0 mm; females to 10.0 mm
Number of Species in Genus: Nine (8 anchialine and 1 freshwater), all stygobitic
|Genus range for Bahadzia|
Species Range: B. setodactylus is known only from Xcan-ha
Cenote on Cozumel (Holsinger, 1992)
Closest Related Species: B. bozanici and B. setodactylus appear to be sister taxa that evolved from a common ancestor (Holsinger, 1992).
Habitat: Anchialine limestone caves
Ecology: B. setodactylus was collected below a halocline (34 ppt salinity) at 12 m depth. Associated fauna includes the shrimp Agostocaris bozanici (Holsinger, 1992).
Life History: The type series consisted of 2 males and 8 females.
Evolutionary Origins: The genus Bahadzia is most closely allied phylogenetically with Mayaweckelia and Tuluweckelia from the Yucatan Peninsula (Holsinger, 1992). Of these three genera, Bahadzia represents the most recent cave colonization event, thought to have occurred during the middle to late Pleistocene. B. bozanici is believed to be close to the putative ancestral species that independently and simultaneously colonized caves on both Cozumel and the mainland (Holsinger, 1992). B. setodactylus, inhabiting an adjacent but apparently separate aquifer system on Cozumel, has diverged to a greater degree.
Conservation Status: Known only from a single cave on the the island of Cozumel.
Contributor: John R. Holsinger, Old Dominion University, Norfolk, VA
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