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Systematics of the crayfishes of the hagenianus group of the genus procambarus subgenus girardiella decapoda cambaridae

, : Systematics of the crayfishes of the hagenianus group of the genus procambarus subgenus girardiella decapoda cambaridae. Tulane Studies in Zoology and Botany 20(3-4): 57-98

The Hagenianus group of the crawfish genus Procambarus represents those members of the subgenus Girardiella which occur east of the Mississippi River and south of the Ohio River [USA]. Standard taxonomic procedures and morphometric analyses revealed that there are 5 distinct species, 4 of which are new [named P. (G.) barbiger, P. (G.) cometes, P. (G.) connos, and P. (G.) pogum ], and that P. hagenianus exists as 2 sspp., 1 previously undescribed and herein named P. h. vesticeps. The most conspicuous feature of the undescribed taxa is a beard of setae along the mesial margin of the palm, especially in Form I males. Significant morphological distinctions exist in the 1st pleopods of males, in the annuli ventrales of females, in the chelipeds and in the antennal scales. The group is nearly unique in possessing stout spines which extend beyond the distal margin of the mesial ramus of the uropods; it is unique in the subgenus in that all members lack a cephalic process on the 1st pleopod. Data suggest close relationships with P. (G.) tulanei Penn and a single invasion of their present habitats from the north via the upper coastal plain. There is no evidence of clinal variation, and the species are neither more nor less variable, inter- or intraspecifically, than other crawfishes similarly studied.

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