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Lithoxancistrus orinoco, nouveau genre et espèce de poisson-chat du Rio Orinoco en Colombie (Pisces, Siluriformes, Loricariidae).
... obs.). Isbrücker et al. (1988) described Lithoxancistrus orinoco as a new genus and species based on the derived presence of large papillae located behind each dentary. Isbrücker et al. (2001) described Guyanancistrus for several species that were formerly placed in Lasiancistrus (Isbrücker 1980;Heitmans et al. 1983). ...
... = drainage, L. = length, W = width. (Heitmans, Nijssen, and Isbrücker 1983) P. niger (Norman 1926) P. nigrescens Eigenmann 1912 P. orinoco (Isbrücker, Nijssen and Cala 1988) P. papariae Fowler 1941 P. schomburgkii (Günther 1864) P. sidereus new species Diagnosis: Pseudancistrus is not diagnosed by any unique characteristics. Characteristics considered as synapomorphies for Pseudancistrus from Armbruster (2004) are: no suture between pterotic-supracleithrum and hyomandibula (34-0, reversal), no contact of the hyomandibula with the prootic (35-1), straight, spoon-shaped anterior process of metapterygoid (58-1), nasal bone not much wider than laterosensory canal running through it (105-ZOOTAXA 0), sphenotic not contacting posteriormost infraorbital externally (117-1), and a short ventral ridge on the pelvic basipterygium (172-1, lost in some species). ...
... The type of Pseudancistrus coquenani has the enlarged papilla behind the dentary teeth that was used to diagnose Lithoxancistrus orinoco (Isbrücker et al. 1988). It is likely that P. orinoco and P. guentheri are sisters based on this characteristic. ...
Pseudancistrus sidereus is described from two collections of specimens from Amazonas, Venezuela. Pseudancistrus sidereus differs from all other members of Pseudancistrus based on the presence of a unique keel on the caudal peduncle formed from the concave dorsal sections of the plates in the ventral series, light spots on the body (these may be yellow in life) centered on the body plates and the absence of the characteristics of the more derived members of Pseudancistrus such as hypertrophied odontodes along the snout in males and females and the loss of evertibility of the cheek plates. Pseudancistrus includes Lithoxancistrus and Guyanancistrus and is diagnosed by the following synapomorphies: no suture between pterotic-supracleithrum and hyomandibula, no contact of the hyomandibula with the prootic, straight, spoon-shaped anterior process of metapterygoid, nasal bone not much wider than laterosensory canal running through it, sphenotic not contacting posteriormost infraorbital externally, and a short ventral ridge on the pelvic basipterygium (lost in some species). Two species formerly assigned to Guyanancistrus are placed in different genera. Hypostomus guacharote is placed in Lasiancistrus and Chaetostomus trinitatis is placed in Ancistrus.
... five), and Lithoxancistrus can be distinguished from Pseudancistrus by the presence of three buccal papillae (vs. one; Isbrücker et al. 1988). ...
... Pseudancistrus nigrescens Eigenmann, 1912: ANSP 177379, 5, 96.4−133.5 mm SL, Burro Burro river, Water Dog Falls, Essequibo river basin, Guyana. Lithoxancistrus orinoco (Isbrücker, Nijssen & Cala, 1988): ANSP 160600, 6, 68.0−78.5 mm SL, Orinoco river, Venezuela. Pseudancistrus pectegenitor Lujan, Armbruster & Sabaj, 2007: ANSP 190755, 1, 206.2 mm SL, Ventuari river, Orinoco river basin, Venezuela. ...
Two new species of Pseudancistrus, a genus diagnosed by non-evertible cheek plates and hypertrophied odontodes along the snout margin, are described from two drainages of the Brazilian Shield: P. kayabi from the rio Teles Pires (rio Tapajós basin) and P. asurini from the rio Xingu. The new species are distinguished from congeners (P. barbatus, P. corantijniensis, P. depressus, P. nigrescens, P. reus, and P. zawadzkii) by the coloration pattern. Pseudancistrus kayabi has dark bars on the dorsal and caudal fins which are similar to that of P. reus from the Caroní River, Venezuela. Pseudancistrus asurini is unique among Pseudancistrus in having whitish tips of the dorsal and caudal fins in juveniles to medium-sized adults.
... Isorineloricaria tenuicauda (Steindachner, 1878) X X X Steindachner (1878) | MSNG 8856 | NMW 42596, 44263-66, 44268), 44294 | ZMUC 85 Isorineloricaria villarsi (Lütken, 1874)+ Ray and Armbruster (2016) Armbruster & Page, 2006 X Armbruster and Page (2006) | ICNMHN 13455 | FMNH 96959, 101378 | MSU 2736.2 | USNM 177204 *Pterygoplichthys zuliaensis Weber, 1991 X Ortega Ancistrus caucanus Fowler, 1943 X X X Fowler Ancistrus vericaucanus Taphorn, Armbruster, VillaNavarro & Ray, 2013 X X X Taphorn et al. (2013) Dekeyseria amazonica Rapp Py-Daniel, 1985 X Mojica et al. (2005) Dekeyseria brachyura (Kner, 1854) X Ortega Lara (2016) Dekeyseria pulchra ( Steindachner, 1915) X Galvis et al. (2007a) Dekeyseria scaphirhyncha (Kner, 1854) X Maldonado Lasiancistrus caucanus Eigenmann, 1912 X X X Eigenmann (1912) | Fowler (1945) | Dahl (1955) Lasiancistrus guacharote (Valenciennes, 1840) X Ortega Lasiancistrus schomburgkii (Günther, 1864) X Armbruster (2005) Lasiancistrus tentaculatus Armbruster, 2005 X Armbruster (2005) | IAvH-P 5100-5105, 7692, 7982, 7983, 9487, 9595, 9596 Lithoxancistrus orinoco Isbrücker, Nijssen & Cala, 1988X Isbrücker et al. (1988 | ICN-MHN 1200, 1201 | ZMA 119882 | ZMUL 972/3482 *Pseudolithoxus anthrax ( Armbruster & Provenzano, 2000) X IMCN 6601, 6602, 6603,6604, 5874, 5880, 5881, 6063, 6064, 6231 Pseudolithoxus dumus ( Armbruster & Provenzano, 2000) X Cetopsis amphiloxa ( Eigenmann, 1914 Cetopsis motatanensis ( Schultz, 1944) X Ortega Cetopsis orinoco ( Schultz, 1944) X Cala (1977); Vari et al. (2005) Cetopsis othonops ( Eigenmann, 1912) X X X X Eigenmann (1912) | Vari et al. (2005) Cetopsis umbrosa Vari, Helogenes castaneus ( Dahl, 1960) ...
The present work is part of a process to create a Catalogue of the Freshwater Fishes of Colombia and consisted in the depuration and updating of the taxonomic and geographic components of the checklist of the freshwater fishes of Colombia. An exhaustive revision of the 1435 species recorded in 2008 was necessary to: 1. Add new species described since 2009 and species originally described from Colombia but inadvertently omitted in 2008; 2. Add new records of already described species; 3. Delete species whose presence in Colombia was not supported by voucher specimens in ichthyological collections; and 4. Revise the geographic distribution of the species listed in 2008. This process resulted in the following numbers: 1. Total number of freshwater fish species in Colombia: 1494; 2. Number of species recorded by hydrographic region - Amazon: 706, Orinoco: 663, Caribbean: 223, Magdalena-Cauca: 220, Pacific: 130; and 3. Number of endemic species: 374 (76% from the trans-Andean region). Updating the current checklist is a fundamental requirement to ensure its incorporation in the decision-making process with regard to the conservation of Colombian aquatic species and ecosystems, which are facing transformation processes as a result of activities such as mining, construction of hydroelectric plants, expansion of the agricultural frontier and subsequent deforestation, industrial and domestic pollution, development of waterways, introduction of exotic species, and climate change.
For the first time, the catalog of type specimens of ICN-MHN is presented with high resolution photographs. The catalog lists 87 species in 161 lots and includes 41 holotypes, 3 neotypes, and 117 lots of paratypes. Some doubts remain about type specimens of some species described by Miles and Dahl that were supposedly deposited at ICN-MHN. The history of the collection is reconstructed and valuable specimens once considered lost or destroyed have been rediscovered. The botanical and zoological collections of the ICN can be consulted online (http://www.biovirtual.unal.edu.co).
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