Procambarus tenuis Hobbs, 1950

Morehouse, Reid L. & Tobler, Michael, 2013, Crayfishes (Decapoda: Cambaridae) of Oklahoma: identification, distributions, and natural history, Zootaxa 3717 (2), pp. 101-157: 139-140

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Procambarus tenuis Hobbs, 1950


Procambarus tenuis Hobbs, 1950  : Ouachita Mountain Crayfish

General charateristics. Adults rarely exceed 125 mm in total length. The carapace is strongly compressed, and the areola is very narrow and nearly closed. The boss on the coxae of the fourth pereiopod is greatly expanded ventrally. The rostrum does not have lateral spines. Chelae are stout and oval in shape, and palms have a row of 7 to 9 tubercles lining their mesial surface. In form I males, gonopods terminate in three processes and the central projection is corneous and the most prominent of the processes, while the mesial process is thin, triangular, and directed caudally at nearly a 90 ° angle with the axis of shaft (Hobbs, 1948).

Life coloration. The background color is usually light tan to reddish brown with dark dots over the whole body ( Figure 87View FIGURES 85 – 89. 85). Ventral side is pale yellow to whitish.

Similar species. In the native range of P. tenuis  , there are no other Procambarus  species that could be confused with P. tenuis  .

Distribution and habitat. Procambarus tenuis  occurs in the Arkansas, Ouachita, and Red River basins of western Arkansas and southeastern Oklahoma. In Oklahoma, P. tenuis  has been found in three counties (LeFlore, Pushmataha, Pittsburg). Our ecological niche model indicates that suitable environmental conditions may be available in Haskell, Latimer, Atoka, and McCurtain counties ( Figure 88View FIGURES 85 – 89. 85). Procambarus tenuis  has been found burrowing adjacent to and within clear cool springs and streams, and found under rocks in permanent flowing streams exhibiting qualities of both a secondary and tertiary burrower (Hobbs, 1989; Jones & Bergey, 2007).

Life history. Procambarus tenuis  is rare within its native range. We have collected form II males, females, and juveniles in March and April. Form II males and females have also been collected year round (J. Dyer, personal communication).

Syntopic species. Orconectes leptogonopodus  , Orconectes menae  , Orconectes palmeri longimanus  , and Orconectes saxatilis  .

Conservation status. AFS: Vulnerable; Heritage Rank: Imperiled (G 3); IUCN: Data Deficient; ODWC: Tier 1.

Additional resources. Jones & Bergey (2007).