Species Description: Venegas PJ, Duellman WE 2012 Two syntopic new species of the Pristimantis orestes Group (Anura: Strabomantidae) from northwestern Peru. Zootaxa 3249: 47-59.
The following features differentiate P. stipa from the rest of the species in Pristimantis, including the 15 assigned to the P. orestes group (with the exception of P. simonsii): P. stipa has a smooth dorsum, the discs on the fingers and toes are narrow and lack marginal grooves, and ulnar nodules form a low fold. P. stipa can be easily distinguished from P. simonsii by the following characteristics: prominent dentigerous processes of vomers (which are absent in P. simonsii), both the tympanic annuls and tympanic membrane are distinct (they are absent in P. simonsii), and toe V is just a bit shorter than toe III (in P. stipa, toe V and toe III are just about the same length). Because P. stipa lacks marginal grooves on the discs of the toes and fingers, it can be confused with Phrynopus, of which one species, P. thompsoni, is also found. However, P. thompsoni has rows of small swellings on the dorsum, both the tympanic membrane and the tympanic annulus are absent, fingers I and II are the same length, and the venter is tan with lighter brown spots (Venegas and Duellman 2012).
Coloration in life: In the female holotype, the dorsum is homogenously brown. The groin, posterior and anterior surfaces of the thighs, and dorsal surfaces of the feet are a darker shade of brown decorated with dull white blotches. The venter is a dark brown with white spots. The iris is grayish-white with a network of thin, brown lines. Males have brownish cream mottling on their throats while the same mottling on females is white (Venegas and Duellman 2012).
Coloration in preservation: In ethanol, the coloration is the same as the live holotype. The only difference is that dark shades of brown are now simply light brown and the dull white blotches are now solid white (Venegas and Duellman 2012).
Variation: Females are larger than males. Both the morphology and the coloration of the paratypes are identical to the holotype (Venegas and Duellman 2012).
Distribution and Habitat
Trends and Threats
Venegas, P. J., and Duellman, W. E. (2012). ''Two syntopic new species of the Pristimantis orestes Group (Anura: Strabomantidae) from northwestern Peru.'' Zootaxa, 3249, 47-59.
Written by Adolfo Ivan Gomez (adolfoivangomez AT gmail.com), Museum of Vertebrate Zoology, UC Berkeley
First submitted 2012-11-02
Edited by Michelle S. Koo (2012-11-17)
Feedback or comments about this page.
AmphibiaWeb's policy on data use.