Overview

Comprehensive Description

[[ Cordylancistrus Isbruecker ZBK ]]

Artificial key for the species of the genus Cordylancistrus ZBK

A) Lateral plates of the body without spiny keels.............................................................B

Lateral plates of the body with spiny keels..................................................................... ............................................ Cordylancistrus platycephalus (Boulenger, 1898) Ecuador

B) Evertible odontodes of the interopercular area well developed (hypertrophied), visible and numerous (generally 10 or more)..........................................................................C

Evertible odontodes of the interopercular area inconspicuous and reduced in number to two or three...................... Cordylancistrus platyrhynchus (Fowler, 1943) Colombia

C) Edge of the posterior lip without undulations..............................................................D

Edge of the posterior lip with marked undulations.......................................................E

D) Color pattern of the body and fins uniform, grayish-green to light or dark brown. Head depth 17.4-19.0% of standard length. Longest evertible interopercular odontode doesn't reach the cleithral spine....................................................................................... ................................... Cordylancistrus perijae Perez and Provenzano, 1996 ZBK Venezuela

Color pattern of the body with a midlateral irregular dark stripe with four or five vertical projections, these projections join in the dorsal region and surround four to five pale areas, fins with three to four dark bands, distal border of the first dorsal rays pale, distal border of the upper lobe of the caudal-fin rays pale. Head depth 14.6-16.4% of standard length. Longest evertible interopercular odontode reaches the end of the cleithral spine................................ Cordylancistrus torbesensis (Schultz, 1944) Venezuela

E) Color pattern of the body uniform light to dark brown, without spots. Fins spines with three to four whitish spots. Head depth 14.3-17.7% of standard length........................ .................................................. Cordylancistrus daguae (Eigenmann, 1912) Colombia

Color pattern of the body grayish-green with whitish irregular spots. Fins spines with four to six whitish spots. Head depth 17.2-20.2% of standard length ........................... ......................................................... Cordylancistrus nephelion ZBK new species Venezuela

  • Francisco Provenzano, Nadia Milani (2006): Cordylancistrus nephelion (Siluriformes, Loricariidae), a new and endangered species of suckermouth armored catfish from the Tuy River, north-central Venezuela. Zootaxa 1116, 29-41: 38-38, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:A3A1A678-3619-48D3-AD5F-1DD0F3A94E22
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[[ Cordylancistrus Isbruecker ZBK ]]

The genus Cordylancistrus ZBK was described by Isbrücker (1980) with C. torbesensis (Schultz, 1944) as the type and only species. Isbrücker (1980: 48) stated that: “ Cordylancistrus ZBK seems related to the genus Lasiancistrus , from which it can easily be distinguished by its exceptionally wide head”. Pérez and Provenzano (1996) described C. perijae ZBK , indicated some external characters that define the genus Cordylancistrus ZBK and postulated a close relationship between Cordylancistrus ZBK and the genus Chaetostoma ZBK . They also presented a biogeographic hypothesis on the distribution of C. torbesensis and C. perijae ZBK . Isbrücker (2001) included in the genus Cordylancistrus ZBK the species: C. daguae , C. perijae ZBK , C. platycephalus , C. platyrhynchus and C. torbesensis , without comment. Fisch-Muller (2003) listed the same five species of Cordylancistrus ZBK . Armbruster (2004) indicates that species of the genera Chaetostoma ZBK , Leptoancistrus ZBK , Dolichancistrus ZBK and Cordylancistrus ZBK together form a monophyletic group, but that Cordylancistrus ZBK is apparently not monophyletic and pointed out that only one basic difference (naked snout) was found between the species of Chaetostoma ZBK and the species assigned to Leptoancistrus ZBK , Dolichancistrus ZBK and Cordylancistrus ZBK . He transferred Cordylancistrus platyrhynchus to the genus Chaetostoma ZBK and presented a new diagnosis for Chaetostoma ZBK while maintaining the rest of the genera. Apparently, the recognition of genera and the assignment of species to a genus are controversial. Transitory, we agree with Isbrücker (2001) and Fisch-Muller (2003) and accept five species in the genus Cordylancistrus ZBK .

  • Francisco Provenzano, Nadia Milani (2006): Cordylancistrus nephelion (Siluriformes, Loricariidae), a new and endangered species of suckermouth armored catfish from the Tuy River, north-central Venezuela. Zootaxa 1116, 29-41: 30-30, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:A3A1A678-3619-48D3-AD5F-1DD0F3A94E22
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Wikipedia

Cordylancistrus

Cordylancistrus is a genus of suckermouth armored catfish native to South America.[1] It is much the same as Chaetostoma. The few differences are a wider head, longer cheek odontodes, and plates on the snout. Cordylancistrus can be found in rivers and streams high in the Andes, from Venezuela to Ecuador.[2]

Species

There are currently Seven recognized species in this genus: [3][4]

References

  1. ^ "Cordylancistrus". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=679412. Retrieved 6 June 2006.
  2. ^ http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/chaeto/cordyl.html
  3. ^ Froese, Rainer, and Daniel Pauly, eds. (2011). Species of Cordylancistrus in FishBase. December 2011 version.
  4. ^ a b Tan, M. & Armbruster, J.W. (2012): Cordylancistrus santarosensis (Siluriformes: Loricariidae), a new species with unique snout deplatation from the Río Santa Rosa, Ecuador. Zootaxa, 3243: 52–58.
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