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Apistogramma megaptera (Perciformes: Cichlidae) Apistogramma megaptera (Perciformes: Cichlidae), una nueva especie para la cuenca del Orinoco

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We describe a new species, Apistogramma megaptera (Perciformes: Cichlidae) that occurs in the upper Orinoco River Basin, in the Inírida, Atabapo and Mavaca rivers of Venezuela and Colombia. This species is characterized by a deep body and a sexual dimorphism expressed in the different shape of the dorsal and caudal fins of males and females, as well as color pattern. Other diagnostic features that differentiate it from other species from Orinoco with crossbars on the caudal fin (Apistogramma iniridae, A. velifera and A. inornata) are: anal fin with marginal black stripe; dorsal fin with a thin marginal black line; infraorbital band wide, its width equal to the pupil; these characters are not present in the above mentioned species. The males reach a larger size (58.7 mm LS) than females (39 mm LS). The pigmentation in the form of crossbars on the tail fin is the character that distinguishes it from other species in the Orinoco River Basin that have immaculate caudal fin (Apistogramma alacrina, A. hoignei, A. hongsloi, A. guttata, A. macmasteri and A. viejita).
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... Except where otherwise stated, methods for counts and measurements are as detailed in R?MeR (2006), R?MeR & HaHn (2008), and R?MeR et al. (2003, 2011, with scale-row numbering following kullandeR (1990). Gill rakers, pharyngeal elements, and details of dentition have not been included in this study (for reasons see ). ...
... This could perhaps trigger the direction of morphometric development randomly, making the re- sulting characters more or less useless for taxonomists. In fact, measuring larger series of specimens has shown significant variation in some proportions even within a particular Apistogramma species, sometimes clearly ex- ceeding value ranges such as those recently used as diag- nostic for species delimitation by Mesa & lasso (2011), for example. Hence the pattern of black in Apistogramma (kullandeR, 1980) and -even more importantly -live coloration, where evolutionary development is most probably driven by sexual selection rather than other fac- tors, remain decisive for species determination. ...
... Hence the pattern of black in Apistogramma (kullandeR, 1980) and -even more importantly -live coloration, where evolutionary development is most probably driven by sexual selection rather than other fac- tors, remain decisive for species determination. Despite our arguments and those of kullandeR, Mesa & lasso (2011) do not use live coloration as a standard diagnostic feature, but instead place excessive value on statistical differences derived from inadequate data, and worse, re- gard collecting sites as diagnostic features. ...
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Apistogramma megastoma sp. n. is described based on a total of 18 specimens from small forest streams in the Departamento Loreto, Peru, tributaries of the Río Jutai in the border area between Peru and Brazil south and west of the city of Leticia (Colombia) (near 04°12′ S / 70°06′ W). Apistogramma megastoma sp. n., which may be confused only with A. barlowi, is distinguished from all other Apistogramma species by the combination of: noticeably disproportionately large head; exceptionally massive jaws, lyrate densely vertically banded caudal fin, extended dorsal-fin membranes in males; in aggressive females sooty head pattern and up to 8 series of small black dashes on flanks; small round caudal spot; and, exceptional for Apistogramma, maternal mouth-brooding behaviour. Distinguished from A. barlowi, by differences in colour pattern and by higher number of scale rows on cheeks. Apistogramma megastoma sp. n. inhabits in small fastflowing streams.
... Lasso et al. 2009); and an important amount of information has also been published in books that include aspects on ecology, fisheries, threats, and migratory status (e.g. Usma et al. 2009, 2013, Lasso et al. 2011a, Maldonado-Ocampo et al. 2012, Zapata and Usma 2013). During this time frame (nine years), fieldwork efforts have been conducted mainly in three of the five hydrographic Colombian regions as delimited by IDEAM (2015): Amazon (Putumayo, Caquetá, Guainía, and Vaupés rivers), Orinoco (piedmont rivers of the Meta and Guaviare basins, and rivers draining directly to the Orinoco as the Bita and Inírida), and Magdalena-Cauca (especially the upper and middle sectors). ...
... Indicates the type of commercial use of each species (i.e., Fisheries, Ornamental). The list of fish species included in Colombian inland fisheries is from Lasso et al. (2011a), while the list of ornamental species is from Ortega and Ortega-Lara (2016). locality. ...
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The catalog of type specimens of freshwater fishes deposited in the Colección de Peces Dulceacuícolas del Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P) is presented. This list includes 483 specimens in 65 lots representing 11 holotypes and 472 paratypes of 48 nominal species. Corrections, additions, and updating of information in the original descriptions are included in individual remarks for each catalog number entry and a gallery of pictures of holotypes or paratypes of each nominal species is also presented, which supplements some original descriptions lacking figures of their respective types. An online version of the catalog is available at http://humboldt.org.co/en/servicios/colecciones-biologicas/catalogo-de-tipos.
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Apistogramma alacrina, new species, from the Orteguaza (Amazon basin) and upper Guaviare (Orinoco basin) river drainages in Colombia, represents a unique distribution pattern covering western Orinoco and western Amazon tributaries. It is unique in the genus in possessing a dark blotch lining the ventral margin of the pectoral-fin base. It is otherwise most similar to species of the A. macmasteri species group, but males have short instead of produced dorsal-fin lappets.
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Apistogramma inconspicua sp.n. is described from the Rio Candclaria in the Rio Guaporé drainage in Bolivia, and recorded also from Cáceres on the Rio Paraguay in Brazil. The new species is closely related to the Paraguayan species A. commbrae (Regan) and an undescribed species in the Guaporé drainage system. These species share a specialized feature in the colour pattern, viz. an expanded vertical bar on the caudal peduncle which it confluent with the caudal spot. The now presumably complete record of Paraguayan Apistogramma species allows an analytical key to be given. Of the additional species, A. borellii (Regan) and A. trifasciata (Eigenmann & Kennedy) represent two distinct lineages. Apistogramma pleurotaenia (Regan) is probably a La Plata basin species, although no localities are known, and its relationship remain obscure. The assemblage of Paraguayan Apistogramma species reflects the heterogeneity of the Paraguayan cichlid fauna as a whole.
Lasso 7b. Mancha axilar marrón clara y única (nunca doble) o ausente. Distribuidas desde el medio río Meta hasta el golfo Paria
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Mesa-Salazar, L. y C. A. Lasso 7b. Mancha axilar marrón clara y única (nunca doble) o ausente. Distribuidas desde el medio río Meta hasta el golfo Paria...........................................9
Descripción de una nueva especie de Apistogramma (Teleostei-Cichlidae) del río Morichal Largo de Venezuela
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Antonio, M. E., S. O. Kullander y C. A. Lasso. 1989. Descripción de una nueva especie de Apistogramma (Teleostei-Cichlidae) del río Morichal Largo de Venezuela. Acta Biológica Venezuelica 12 (3-4): 131-139.
Sinopsis de las especies de peces de la familia Cichlidae presentes en la cuenca del río Orinoco: claves, diagnosis, aspectos bio-ecológicos e ilustraciones
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Eine neue Apistogramma-Art aus dem mittleren Amazonas-Gebiet, zugleich mit dem Versuch einer Übersicht über die Gattung
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Fishes of the River Ucayali
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