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A new species of the catfish genus Cordylancistrus (Siluriformes, Loricariidae) from the Magdalena River, Tolima, Colombia
Abstract
A new species of catfish is described from Colombia, and provisionally assigned to the genus Cordylancistrus. The new species is most similar to C. perijae and C. nephelion from Venezuela. The description is based on ten specimens collected from tributaries of the Magdalena River which drain the eastern slope of the Cordillera Central and the western slope of Cordillera Oriental, in the Department of Tolima. The new species is the first Cordylancistrus described from the Magdalena River basin. With this discovery, the number of Cordylancistrus species in Colombia increases to three. The geographic distribution of the species suggest that Andean orogenesis played an important role in the diversification of the group.
... The new species is tentatively included in the genus Cordylancistrus, increasing number of Cordylancistrus species described for Colombia to three. The species C. platyrhynchus (Fowler, 1943) from the Amazon River basin, Colombia, was previously considered included in the genus Cordylancistrus (Provenzano & Milani, 2006;Provenzano & Villa-Navarro, 2017), but was transferred to the genus Chaetostoma (Armbruster, 2004(Armbruster, , 2008, and we tentatively accept this move. According to known phylogenetic hypotheses, species grouped in the genera Andeancistrus, Chaetostoma, Cordylancistrus, Dolichancistrus, Leptoancistrus and Transancistrus constitute a monophyletic group, the Chaetostoma group or clade (Armbruster, 2004(Armbruster, , 2008Lujan, et al. 2015b,c). ...
... Therefore, this genus is considered as questionable (Armbruster, 2004(Armbruster, , 2008Lujan, et al. 2015b). This result may be reflected in the variability of the external morphological characteristics of recently described new genera and species (Tan & Armbruster, 2012;Salcedo, 2013;Salcedo & Ortega, 2015;Lujan, et al. 2015a,c;Provenzano & Villa-Navarro, 2017). Some of these new species exhibit external morphological characteristics such as a naked snout, lateral body plates with spiny keels, longest movable cheek odontodes pass pectoral-fin origin, etc., that may be present in species ascribed to different genera. ...
... Recently, analyses of fishes that inhabit the Andean rivers of Colombia has resulted in the discovery of new species of the loricariid catfish genus Cordylancistrus (Provenzano & Villa-Navarro, 2017;, but just as important as the discovery of new species, is finding specimens of species that have been only known from type specimens. In this case, five specimens that agree with the original description of Chaetostomus setosus Boulenger, 1887 were found. ...
... The genus Cordylancistrus was established by Isbrücker (1980) with C. torbesensis (Schultz, 1944) as the type species. Since 1980, some species have been described and/or assigned to the genus Cordylancistrus (Pérez & Provenzano, 1996;Isbrücker, 2001;Provenzano & Milani, 2006;Tan & Armbruster, 2012;Provenzano & Villa-Navarro, 2017;. Until now, the genus has been controversial, and phylogenetic hypotheses demonstrate that Cordylancistrus is not monophyletic; however, the species included in it, belong to the Chaetostoma group, a well-supported clade (Armbruster, 2004(Armbruster, , 2008Lujan et al., 2015b). ...
During a survey of loricariid catfishes from Colombia, specimens that match the original description of Chaetostomus setosus Boulenger, 1887 were found. This is the first record after the original description. A redescription and a precise capture locality of the species are provided. The analysis of external characters indicate that the species belongs within the Chaetostoma group; however, specimens of C. setosus possess a mixture of external characters that make generic identification difficult. Tentatively, the species is allocated to the genus Cordylancistrus. External morphology of the known species that belong to the Chaetostoma group (mainly type specimens) was analyzed to find diagnostic characters that may be used for appropriate generic assignment. The results of this analysis are presented herein.
... The new species is tentatively included in the genus Cordylancistrus, increasing number of Cordylancistrus species described for Colombia to three. The species C. platyrhynchus (Fowler, 1943) from the Amazon River basin, Colombia, was previously considered included in the genus Cordylancistrus (Provenzano & Milani, 2006;Provenzano & Villa-Navarro, 2017), but was transferred to the genus Chaetostoma (Armbruster, 2004(Armbruster, , 2008, and we tentatively accept this move. According to known phylogenetic hypotheses, species grouped in the genera Andeancistrus, Chaetostoma, Cordylancistrus, Dolichancistrus, Leptoancistrus and Transancistrus constitute a monophyletic group, the Chaetostoma group or clade (Armbruster, 2004(Armbruster, , 2008Lujan, et al. 2015b,c). ...
... Therefore, this genus is considered as questionable (Armbruster, 2004(Armbruster, , 2008Lujan, et al. 2015b). This result may be reflected in the variability of the external morphological characteristics of recently described new genera and species (Tan & Armbruster, 2012;Salcedo, 2013;Salcedo & Ortega, 2015;Lujan, et al. 2015a,c;Provenzano & Villa-Navarro, 2017). Some of these new species exhibit external morphological characteristics such as a naked snout, lateral body plates with spiny keels, longest movable cheek odontodes pass pectoral-fin origin, etc., that may be present in species ascribed to different genera. ...
As a part of an assessment of loricariid catfishes inhabiting the Andes of Colombia, specimens belonging to an interesting new species were identified. The new species is described herein, and it is tentatively included in the genus Cordylancistrus. The new species can be easily distinguished among its congeners by the presence of a unique diagnostic character: a fleshy keel or excrescence, black or dark brown, over the posterior tip of supraoccipital. Specimens of the new species were captured in rivers of the Sierra Nevada de Santa Marta and the Sierra de Perijá that drain to the Magdalena River Basin and Caribbean Sea. The occurrence of one species of Cordylancistrus in the Sierra Nevada de Santa Marta could have interesting biogeographic implications for hypotheses related to the geological history of northwestern corner of South America or to the dispersal or vicariance models used to explain biogeographical patterns of related species in Colombia.
... The Upper Río Magdalena Basin is a region with a relatively well documented ichthyological knowledge in Colombia, which is reflected in the high variety of works published recently, life history studies Zúñiga-Upegui et al. 2014), patterns of community structure (Miranda et al. 2018;Montoya-Ospina et al. 2018;Poveda-Cuellar et al. 2018), ecomorphology (Conde-Saldaña et al. 2017), exotic species (Albornoz-Garzón and Villa-Navarro 2017), new species descriptions (Ortega-Lara et al. 2011;García-Alzate et al. 2015;García-Melo et al. 2016;Provenzano and Villa-Navarro 2017;Villa-Navarro et al. 2017;Albornoz-Garzón et al. 2018;García-Melo et al. 2018), karyotype descriptions , 2019aIbagón et al. 2020), and list of species (Villa-Navarro et al. 2006). However, our understanding of basic aspects of the fishes from small drainages in the Upper Magdalena is still limited. ...
An annotated list of the freshwater fishes of the Río Alvarado drainage, Upper Río Magdalena Basin is presented. Fishes were captured from nine localities, quarterly sampled between September 2012 and July 2013. A total of 36 species belonging to 14 families, distributed in five orders were collected. The most abundant species was Trichomycterus banneaui (Eigenmann, 1912) (19.4%), followed by Creagrutus affinis Steindachner, 1880 (13%), Chaetostoma thom-soni Regan, 1904 (9.1%), Trichomycterus mogotensis Ardila-Rodríguez, 2017 (7.7%), Astroblepus homodon (Regan, 1904) (6.6%), Creagrutus dulima Albornoz-Garzón, Conde-Saldaña, García-Melo, Taphorn & Villa-Navarro, 2018 (5.9%), Poecilia sphenops Valenciennes, 1846 (5.7%) and Argopleura magdalenensis (Eigenmann, 1913) (5.6%). An identification key and a complete photographic catalog of all fish species recorded in the drainage are presented.
Este libro recopila y aporta nueva información acerca de las condiciones sobre la historia natural de algunas especies de peces que son comunes de la región de los llanos. También se discuten varias hipótesis del efecto de factores abióticos y bióticos sobre el origen y diversidad de especies en el Llano de Venezuela. Se plantean, por
otro lado, diversas problemáticas acerca del potencial pesquero y pesquerías en estas áreas, posibilidades del desarrollo piscícola y de conservación de la fauna silvestre; líneas de investigación y planes a desarrollar que permitirán obtener información básica y aplicada para la utilización y éxito de programas de manejo adecuado de los recursos naturales y pesqueros.
Objetivos:
Conocer los avances taxonómicos en peces de aguas dulces en el período 2010-2019, con base en la característica megadiversidad de la riqueza de especies de peces dulceacuícolas en Colombia.
Alcance:
Inventario de los peces dulceacuícolas adicionados a las listas conocidas en el país.
Metodología:
Se realizó una detallada y exhaustiva revisión del material biológico presente en Colecciónes personales, en museos y en centros de investigación, así como de los registros publicados entre 2010 y 2019.
Principales resultados:
Fruto de la búsqueda e investigación realizada, se registran 110 especies de peces dulceacuícolas nuevas para Colombia (América del Sur): (dos en 2010, 14 en 2011, cuatro en 2012, nueve en 2013, nueve en 2014, diez en 2015, tres en 2016, seis en 2017, nueve en 2018, una en 2019). Estas especies fueron descritas de las cuencas del Magdalena, Caribe, Orinoco, Cauca, Pacífico, Amazonas, San Juan, Catatumbo, y Atrato; en los ríos colombianos: Amazonas, Atrato, Catatumbo, Cauca, Magdalena, Orinoco, del Pacífico y del Caribe de Colombia. Las 110 nuevas especies registradas aquí pertenecen a 15 familias y 32 géneros que se encuentran en los departamentos de Amazonas (4), Antioquia (5), Boyacá (1), Caldas (4), Cauca (1), Casanare (1), Cesar (10), Córdoba (4), Chocó (5), Cundinamarca (2), Guainía (2), Guaviare (1), La Guajira (1), Huila (1), Magdalena (2), Meta (12), Nariño (3), Putumayo (3), Risaralda (2), Santander (27), Norte de Santander (6), Tolima (10), Valle del Cauca (1), Vaupés (1) y Vichada (1). Así mismo, las altitudes cubren un amplio rango pues fluctuaron entre 1 y 2.700 msnm.
Conclusiones:
En cuanto a las cuencas, es significativo resaltar la presencia de 62 especies en la cuenca del río Magdalena, que recorre el centro de país e incluye los territorios de 17 departamentos, lo cual sorprende por cuanto es una de las cuencas mejor conocidas y muestreadas. Las 110 especies (2010 - 2019) incluidas en este trabajo, aumentan significativamente el número oficial de especies nacionales y las adiciones confirman la macro-diversidad específica colombiana, particularmente en sus peces de agua dulce. Se resalta que el arduo trabajo de los grupos de investigación ha permitido conocer mejor las cuencas hidrográficas y los peces del país. Entre los factores que han influido positivamente en los hallazgos se encuentran la variedad de artes, métodos, las condiciones de muestreo, la exploración de nuevas áreas geográficas o el trabajo en lugares que hacía años no se visitaban.
El objetivo de este estudio fue determinar la influencia de la cobertura vegetal en la composición, la estructura y la diversidad de la ictiofauna en las quebradas de las zonas de vida de los bosques húmedo premontano (bh-PM) y muy húmedo premontano (bmh-PM) del Alto Magdalena, Colombia. Para esto, se muestrearon 23 estaciones distribuidas en las coberturas vegetales de pastos, mosaico de cultivos, arbustos y bosques en las diferentes zonas de vida. En cada estación se establecieron transectos longitudinales (100 m/ancho variable); los peces se capturaron con un equipo de pesca eléctrica y una red de arrastre (5 m x 1,5 m, ojo de malla de 0,05 m), y se evaluaron paralelamente algunas variables ambientales. La estructura y la diversidad de la ictiofauna se calcularon mediante el uso de modelos estándar. En cuanto a la diversidad, medida con números de Hill, no hubo diferencias significativas entre las coberturas vegetales en el bh-PM. Sin embargo, en el bmh-PM la cobertura de pastos fue la más diversa. En el análisis de escalamiento multidimensional no métrico, no se evidenciaron diferencias en la estructura del ensamblaje de peces en los tipos de cobertura vegetal, sin embargo, en el análisis canónico de correspondencias se evidenció que la cobertura de dosel, la calidad de la vegetación de ribera y la elevación influyeron de manera significativa en la composición y la distribución de la ictiofauna. Si bien la cobertura de pastos presentó la mayor diversidad íctica, es un hábitat con degradación del bosque de ribera y cambios en la temperatura, idóneo para el establecimiento de especies tolerantes e invasoras. © 2018. Acad. Colomb. Cienc. Ex. Fis. Nat.
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.
The rubbernose-pleco genus Chaetostoma comprises 47 currently valid and many undescribed species distributed along Atlantic and Pacific slopes of the Andes Mountains from Panama to southern Peru, the Coastal Mountains of Venezuela, and drainages of the Guiana and Brazilian shields. We present a five-locus molecular phylogeny for 21 described and six undescribed species of Chaetostoma spanning the geographic range of the genus. Bayesian and maximum likelihood analyses found Chaetostoma to be well supported as monophyletic and sister to a clade of central and northern Andean genera that have also been hypothesized to be closely related based on morphology (i.e., Andeancistrus, Cordylancistrus, Dolichancistrus, Leptoancistrus, and Transancistrus). Species of Chaetostoma were divided into a trichotomy consisting of: a Pacific Coast, Central American, Magdalena Basin, Lake Valencia, and Guiana Shield clade a western Orinoco, Lake Maracaibo, and Lake Valencia clade and a widespread upper Amazon/Orinoco clade inclusive of a single species on the Brazilian Shield. We also conducted a systematic review of species from the central Andes of northern Peru and Ecuador. Based on our phylogenetic results and direct examination of historical and recently collected type and non-type material, we describe two new species of Chaetostoma (C. bifurcum, from the Pacific Coast, and C. trimaculineum, from the Atlantic Slope), redescribe four species (C. breve, C. carrioni, C. dermorhynchum, and C. microps, all from the Atlantic Slope), transfer four species from Chaetostoma to Ancistrus and find two species to be junior synonyms. © 2015 by the American Society of Ichthyologists and Herpetologists.
Cordylancistrus santarosensis is described based on five specimens from the Río Santa Rosa, Ecuador. This species can be distinguished from all other members of the Chaetostoma group by having plates on the tip of the snout (except for a central region at the extreme anterior edge), but lacking plates laterally on the head. This snout plating condition is inter-mediate between the fully plated snout of other Cordylancistrus and the unplated snout of Chaetostoma.
Peckoltia contains 12 described species, eight of which are considered valid. Peckoltia arenaria, P. filicaudata, and P. ucayalensis are recognized as synonyms of P. bachi and P. kuhlmanni is recognized as a synonym of P. vittata. In addition, two new species are described. The type species of Peckoltichthys and Sophiancistrus are synonyms of P. bachi and both genera are recognized as junior synonyms of Peckoltia. The species of Peckoltia range throughout much of the Amazon basin, the upper Orinoco, the upper Essequibo, and perhaps the Maroni, and can be identified from most other ancistrins by having dentaries that form angle of 90° or less and from others with angled dentaries by lacking the synapomorphies of those genera. The species of Peckoltia vary from one another mostly in coloration. Peckoltia braueri, P. caenosa n. sp., P. cavatica and P. vittata lack spots on the head while the other species have them. Peckoltia braueri and P. cavatica have orange bands in the dorsal and caudal fins and have the bones and plates of the head and nape outlined in black (vs. no orange bands and head plates and bones not outlined in black in P. caenosa and P. vittata). Peckoltia caenosa has a color pattern consisting of dark vermiculations on the head and abdomen (vs. saddles or blotches on the head and faint dark spots on the abdomen in P. vittata). Among the species with spots on the head, P. lineola n. sp. and P. vermiculata have some of the spots combining to form vermiculations (vs. spots free in P. bachi, P. brevis, P. furcata, and P. oligospila) with the vermiculations larger than the pupil in P. lineola and narrower in P. vermiculata and the vermiculations radiating from a central point in P. vermiculata vs. no such pattern in P. lineola. Peckoltia bachi can be identified from the other species by having widened pelvic-fin spines that can be pulled ventrally such that they are completely ventral and parallel to the body (vs. pelvic-fin spines narrow and cannot be adducted ventral to body) and by having the eye low on the head (vs. high). Peckoltia brevis can be identified from P. furcata and P. oligospila by having well-developed dorsal saddles (vs. saddles faint), no spots on the body behind the nape (vs. spots generally present behind the nape); from P. oligospila by having bands in the caudal fin (vs. spots); and from P. furcata by having the lower caudal-fin spine longer than the upper (vs. upper spine longer). Peckoltia furcata can be identified from P. oligospila by having the upper caudal-fin spine longer than the lower (vs. lower spine longer) and by having bands in the caudal fin (vs. spots). Ancistrus yaravi had been recognized as a species of Peckoltia. The type of A. yaravi is lost, but the original description suggests that the species is the senior synonym of Neblinichthys roraima. A revised morphological phylogeny demonstrates the lack of support for Peckoltia and Hemiancistrus as monophyletic, and phenetic definitions are provided for the two genera. The phylogeny also demonstrates a lack of support of the genus Watawata.
The Neotropical catfish family Loricariidae is the fifth most species-rich vertebrate family on Earth, with over 800 valid species. The Hypostominae is its most species-rich, geographically widespread, and ecomorphologically diverse subfamily. Here, we provide a comprehensive molecular phylogenetic reappraisal of genus-level relationships in the Hypostominae, based on our sequencing and analysis of two mitochondrial and three nuclear loci (4293 bp total). Our most striking large-scale systematic discovery was that the tribe Hypostomini, which has traditionally been recognized as sister to tribe Ancistrini based on morphological data, was nested within Ancistrini. This required recognition of seven additional tribe-level clades: the Chaetostoma Clade, the Pseudancistrus Clade, the Lithoxus Clade, the 'Pseudancistrus' Clade, the Acanthicus Clade, the Hemiancistrus Clade, and the Peckoltia Clade. Results of our analysis, which included type- and non-type species for every valid genus in Hypostominae, support the reevaluation and restriction of several historically problematic genera, including Baryancistrus, Cordylancistrus, Hemiancistrus, and Peckoltia. Much of the deep lineage diversity in Hypostominae is restricted to Guiana Shield and northern Andean drainages, with three tribe-level clades still largely restricted to the Guiana Shield. Of the six geographically widespread clades, a paraphyletic assemblage of three contain lineages restricted to drainages west of the Andes Mountains, suggesting that early diversification of the Hypostominae predated the late Miocene surge in Andean uplift. Our results also highlight examples of trophic ecological diversification and convergence in the Loricariidae, including support for three independent origins of highly similar and globally unique morphological specializations for eating wood.
AbstrAct Chaetostoma formosae sp. nov. is described from piedmont tributaries of the upper río Meta on the Cordillera Oriental in Colombia. The new species is distinguished from its congeners by the presence of an elongate unbranched anal-fin ray with two posterior dermal ridges in mature males, the presence of strongly recurved cheek odontodes, the presence of a parieto-su-praoccipital dermal keel, the posterior margin of the pelvic-fin strongly projected and angulate in shape in mature males, and by details of coloration. The new species belongs to an informal monophyletic group herein called the Chaetostoma anale species group, along with two ad-ditional species, C. anale and C. jegui, from Colombia and Brazil respectively, based on an apomorphic modification of the anal fin in mature males.
A phylogenetic analysis of nearly all genera of the Hypostominae and the Ancistrinae is provided based on osteology, external anatomy, and digestive tract anatomy. The results suggest that the Hypostominae is a paraphyletic assemblage. Delturus and Upsilodus form a monophyletic group sister to all other loricariids. Hemipsilichthys, Isbrueckerichthys, Kronichthys, and Pareiorhina form a monophyletic group with Neoplecostomus and the Hypoptopomatinae and are transferred to the Neoplecostominae. The remainder of the Hypostominae is made paraphyletic by the continuing recognition of the Ancistrinae. Ancistrinae is returned to the Hypostominae and recognized as a tribe, Ancistrini. In addition, four new tribes (Corymbophanini, Hypostomini, Pterygoplichthini, and Rhinelepini) are described. Hypostomus is also paraphyletic, the bulk of it forming a monophyletic clade with Aphanotorulus, Cochliodon, and Isorineloricaria. All of the potential monophyletic groups within Hypostomus grade into one another; therefore, Aphanotorulus, Cochliodon, and Isorineloricaria are placed in the synonymy of Hypostomus. Pterygoplichthys and Glyptoperichthys are also polyphyletic, and Liposarcus and Glyptoperichthys are recognized as synonyms of Pterygoplichthys. Sister to Pterygoplichthys is the Hemiancistrus annectens group (including Hypostomus panamensis) which represents an undescribed genus. The phylogeny presented is compared with previous hypotheses. © 2004 The Linnean Society of London, Zoological Journal of the Linnean Society, 2004, 141, 1−80.
The new Chaetostoma-group genera Andeancistrus and Transancistrus are described based on recently collected material from rivers draining the respective Amazonian and Pacific slopes of the Andes Mountains in Ecuador. Andeancistrus is diagnosable from all other members of the Chaetostoma group by having a fully plated snout, lacking cheek odontodes that extend past the opercular flap, and by having eight vs. nine branched dorsal-fin rays. The new species Andeancistrus eschwartzae is also described and diagnosed from its only congener (A. platycephalus) by having a black to dark gray base color of head and body (vs. light gray), irregularly shaped round to vermiculate yellow-gold spots smaller than half naris diameter evenly distributed across head, lateral and dorsal surfaces of the body and fin rays (vs. white to blue uniformly round spots), and by lacking enlarged clusters of odontodes at the posteromedial apex of most lateral body plates (vs. odontode clusters present). Transancistrus contains the species T. aequinoctialis and T. santarosensis, which can together be diagnosed from all other members of the Chaetostoma group except Chaetostoma by lacking plates along the anterior and lateral margins of the snout; they can be diagnosed from Chaetostoma by having a much narrower unplated snout region, approximately as wide as the maximum diameter of the orbit (vs. twice this width). Geographic distributions exclusive of drainages north of Ecuador and strong molecular phylogenetic evidence for a sister relationship between Andeancistrus and Transancistrus support the hypothesis that these genera may have once been contiguously distributed through a low-lying region of northern Peru and been separated via uplift of the Andes Mountains. © 2015 by the American Society of Ichthyologists and Herpetologists.
new species of loricariid catfish, Cordylancistrus perijae, is described on the basis of 32 specimens collected in three rivers N of Sierra de Perij , in NW Zulia state, Maracaibo Basin, Venezuela. The genus Cordylancistrus was created by Isbrücker (1980) for the single known species, Cordylancistrus torbesensis (Schultz 1944). All specimens of this species were collected in the Torbes River, a tributary of the Uribante River, Apure River system, Orinoco Basin. Cordylancistrus perijae can be recognized from C. torbesensis by the combination of the following characters: Head and caudal peduncle less depressed; odontodes of the interopercular area short, the longest not reaching beyond the base of the pectoral fin; and a distinctive colour pattern. Cordylancistrus torbesensis and C. perijae are restricted to the foothill rivers of the Cordillera de Mérida and Sierra de Perijá, respectively. These rivers belong to different basins (Orinoco and Maracaibo) clearly separated by the Cordillera de Mérida. This geographical distribution adds a new element to the biogeographical discussion about the Venezuelan fauna and lets us suggest a minimum age for the genus Cordylancistrus in Venezuela of approximately 20 my (Early Miocene).
CONTENTS Introduction................... 3 The generic name................. 4 The type species of Hypostomus Lacépède.......... 6 The identity of Acipenser plecostomus Linnaeus........ 9 The distribution and habitats of the Surinam species........ 12 The relationship of the Surinam species............ 17 Some physiographical data on Surinam waters.......... 21 Collecting localities................. 25 Collecting and collections................ 26 Measurements and methods............... 26 Miscellaneous remarks................ 28 The Surinam species................. 29 Key to the Surinam species............... 30 Descriptions of the Surinam species etc............. 31 Acknowledgements................. 72 Summary ................... 73 References................... 73 Addendum................... 77 Diagrams................... 80 INTRODUCTION The imminent realization of the so-called "Brokopondo Project", first put forward in 1950, and involving the establishment of a barrage and hydroelectric plant in the Surinam River at Afobaka, eventually induced members of the Stichting Natuurwetenschappelijke Studiekring voor Suriname en de
A new species of suckermouth armored catfish, Cordylancistrus nephelion, is described from seven specimens collected in tributaries of the Tuy River in the Caribbean Sea basin of north-central Venezuela. Cordylancistrus nephelion can be distinguished from the other species assigned to its genus by its unique color pattern, the head and body being marked with irregular white spots. Cordylancistrus nephelion is the third species of the genus described from Venezuela: Cordylancistrus torbesensis (Schultz 1944) from the Mérida mountain range (Cordillera de Mérida), Orinoco River basin; C. perijae Pérez and Provenzano 1996 from Perijá mountain range (Sierra de Perijá), Maracaibo Lake basin; and now C. nephelion from the La Costa mountain range (Cordillera de La Costa). These three species inhabit isolated foothill rivers and have very restricted geographic distributions. The extreme alteration of the Tuy River basin by humans may threaten Cordylancistrus nephelion and the other fish species endemic to the basin with extinction. An artificial key for the species assigned to the genus Cordylancistrus is presented.
IAvH-5252, 1 ex., 74.0 mm SL, Colombia, Putumayo, Mocoa River Cordylancistrus santarosensis MECN-DP-2061, Holotype, 70.8 mm SL: Ecuador, El Oro Province
- Colombia
- Putumayo
- Sangoyaco Mocoa
- J River
- Maldonado
July 1989.
Cordylancistrus platyrhynchus: MBUCV-V-32672, 4 ex., 48.8-67.7 mm SL, Colombia, Putumayo, Mocoa,
Sangoyaco River, J. Maldonado, 06 Mar. 2005. IAvH-5252, 1 ex., 74.0 mm SL, Colombia, Putumayo, Mocoa
River, Finca La Cascada, J. Maldonado, 07 March 2005.
Cordylancistrus santarosensis MECN-DP-2061, Holotype, 70.8 mm SL: Ecuador, El Oro Province, Santa
Rosa River, Limón, Playas, approx. 03°34'10"S, 79°56'34.5"W, Windsor Aguirre, 09 Jul. 2008.
Cordylancistrus torbesensis MBUCV-V-29430 (ex. MCNG-8066), 1 ex., 57.4 mm SL, Venezuela, Táchira
State, Torbes River, 5 km before Táriba, approx. 07°50'N 72°10'W, D. Taphorn & C. Lilyestron, 27 May 1982.
Transancistrus santarosensis: MEPN-11220, 4 ex., 26.3–52.0 mm SL, Ecuador, El Oro Province
- Sl Mm
- Pichincha Ecuador
- Province
- M Del Guayllabamba
- Olalla
mm SL, Ecuador, Pichincha Province, Río Pachijal afluente del Guayllabamba, approx. 00°01'10 " N
78°47'12 " W, M. Olalla, Aug. 1969.
Transancistrus santarosensis: MEPN-11220, 4 ex., 26.3–52.0 mm SL, Ecuador, El Oro Province, Santa Rosa
River, near Bado, approx. 03°33'31 " S, 79°56'48 " W, N. Lujan, D. Taphorn & R. Barriga, 29 Aug. 2012. MBUCVV-35694, 4 ex. 62.5–94.6 mm SL, Ecuador, Bolívar Province, Guayas River basin, Vinces River system, Caluma
river, near Guaranda, Without additional data.
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