Wednesday, May 26, 2021

[Crustacea • 2021] Procambarus adani • A New Species of Crayfish of the Genus Procambarus, and Notes on Procambarus pilosimanus (Decapoda: Cambaridae) from Chiapas, Mexico


Procambarus adani 
Álvarez, Torres & Villalobos, 2021

A new species of crayfish is described from the Cave of Sótano de La Lucha, in the border between the Mexican states of Chiapas and Oaxaca. The new species is completely adapted to the cave environment with reduced eyes lacking cornea and visual pigments, an almost unpigmented body and elongated appendages. We also report on crayfish populations from the “Lagunas de Montebello” area, which fit well the description of Procambarus pilosimanus (Ortmann, 1906), a heretofore problematic species in southern Mexico.

Keywords: Stygobitic crayfish; Sótano de La Lucha; Lagunas de Montebello; Chiapas

Figure 4. Habitus of a living specimen of Procambarus adani, new species.

Family Cambaridae Hobbs, 1942 
Genus Procambarus Ortmann, 1905 

Procambarus adani n. sp. 

Diagnosis. Body almost unpigmented, whitish with minute orange dots dorsally (Fig. 4). Eyes reduced to a blunt peduncle, no facets or visual pigments present. Rostrum slender, acumen acute, slightly surpassing distal margin of third antennular segment, 26.4 to 31.8% (_ = 28.2%) of TCL, with marginal spines (Fig. 2A). Areola 2.3 to 3.4 times (_ = 2.8) as long as wide, 29.5 to 35.7% (_ = 32.6%) of TCL, 36.7 to 43.6% (_ = 40.6%) of postorbital length, with 4 or 5 punctuations across narrowest part. Postorbital spines prominent, cervical spine robust, single branchiostegal spine (Fig. 2A, B). Antennal scale 1.9 to 2.1 (_ = 2.0) times longer than wide, with shallow longitudinal groove. Chelipeds shorter than total body length, surface covered with minute granules with tuft of short setae; fingers longer than palm, cutting edges finely toothed (Fig. 2C).

Etymology. This species is dedicated to the memory of Adán Gómez González, outstanding biologist and friend, whose untimely passing away has been felt deeply.

Fernando Álvarez, Eduardo Torres and José Luis Villalobos. 2021. New Species of Crayfish of the Genus Procambarus, and Notes on Procambarus pilosimanus (Decapoda: Cambaridae) from Chiapas, Mexico. Revista Mexicana de Biodiversidad. 92(2021): e923833. DOI: 10.22201/ib.20078706e.2021.92.3833