Pseudancistrus barbatu

Chambrier, Sophie De & Montoya-Burgos, Juan I., 2008, Pseudancistrus corantijniensis, a new species from the Guyana Shield (Siluriformes: Loricariidae) with a molecular and morphological description of the Pseudancistrus barbatus group, Zootaxa 1918, pp. 45-58 : 55

Key for the species of the Pseudancistrus barbatu s group

1. Hypertrophied snout odontodes brown-reddish, increasing gradually in size from snout tip to cheeks; very distinct whitish spots covering the body, increasing gradually in size from snout to caudal peduncle.......2

- Hypertrophied snout odontodes whitish, of homogeneous size excepting shorter in the snout tip and a few larger in the cheeks......................................................................................................................................3

2. Minimum interorbital distance <10.8 times in SL (valid for specimens larger than 85 mm), French Guiana rivers, from Oyapock to Maroni ...................................................................... Pseudancistrus barbatus

- Minimum interorbital distance> 10.8 times in SL, rivers of central Suriname: Suriname River and Coppename River ........................................................................................................... Pseudancistrus depressus

3. Head depth> 6.9 times in SL, tiny whitish spots on the anterior part of the head enlarging abruptly in size posterior to the eyes, Corantijn River ............................................................ Pseudancistus corantijniensis

- Head depth <6.5 times in SL, whitish spots increasing gradually in size and becoming hazier from snout to caudal peduncle, Essequibo River .................................................................. Pseudancistrus nigrescens