Field Guide to the Fishes of the Amazon, Orinoco, and Guianas by Sleen Peter van der. Albert James S

Author:Sleen, Peter van der.,Albert, James S. [Sleen van der, Peter and Albert, James S.]
Language: eng
Format: epub
Publisher: Princeton University Press
Published: 2017-03-11T16:00:00+00:00

Dolichancistrus (9.0–13 cm SL)

Differs from Andeancistrus, Cordylancistrus, Chaetostoma, and Leptoancistrus by the much longer pectoral-fin spines in adult males than in adult females and juveniles of both sexes (vs. pectoral spines of equal length); from Andeancistrus, Cordylancistrus, and Chaetostoma by having one or two enlarged cheek odontodes extending beyond the first midventral plate and by having enlarged odontodes along the outermost snout margin, from all species of Chaetostoma except for C. platyrhynchus by having a plated snout (vs. naked), and from Leptoancistrus (not in AOG) by having an adipose-fin spine and membrane (Ballen and Vari 2012). Dolichancistrus further differs from Chaetostoma platyrhynchus in having distally hooked cheek odontodes that extend past the posterior margin of the cleithrum and are evertible to >90º (vs. straight odontodes not reaching the anterior margin of the cleithrum and being evertible only to approximately 30–40º; Ballen and Vari 2012). Species Four, two in AOG region. A fifth (D. setosus) from the Colombian Andes is tentatively assigned to this genus. Review of genus and key to the species in Ballen and Vari (2012). Distribution And Habitat Both sides of the Andes in Colombia and Venezuela. Species inhabit high-altitude montane, torrential streams. Biology No data available, although likely similar to other members of the Chaetostoma Clade (i.e., algivorous and territorial nest builders).

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