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150325s2008 xx |||||o 00| ||eng c |
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|a (DE-627)JST068659482
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|a (JST)27667789
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|c DE-627
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|a eng
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|a DoNascimiento, Carlos
|e verfasserin
|4 aut
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|a The Venezuelan Species of Phenacorhamdia (Siluriformes: Heptapteridae), with the Description of Two New Species and a Remarkable New Tooth Morphology for Siluriforms
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
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|a Online-Ressource
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|a In a taxonomic review of Venezuelan Phenacorhamdia, three species were recorded: P. anisura, originally described from the Río San Juan, Golfo de Paria basin; P. provenzanoi, new species, widely distributed in the Orinoco basin and P. taphorni, new species, restricted to upper Apure river basin. Phenacorhamdia anisura is redescribed based on topotypic material and a large number of specimens from sites across the Orinoco basin, expanding both the previously documented morphological variability and distribution of the species. Phenacorhamdia anisura has a broad distribution, sympatric and even syntopic with P. provenzanoi in the Orinoco basin, and is the only species of the genus found in the Golfo de Paria basin. Phenacorhamdia anisura is distinguished from congeners by the combination of maxillary barbel reaching three fourths along pectoral fin, outer mental barbel not reaching the pectoral-fin base, 5-7 gill rakers on the first arch, 41-43 vertebrae, nine pleural ribs, pectoral fin with modally seven branched rays, first basal radial of dorsal fin inserted posterior to vertebrae 11-12, anal fin with 12-15 rays (7-9 branched), caudal-fin lobes pointed, upper caudal-fin lobe with seven branched rays, lower caudal-fin lobe markedly longer than the upper caudal-fin lobe, uniform pigmentation of the body and some proportional measurements. Phenacorhamdia provenzanoi is diagnosed by the high number of vertebrae (47-48), and anal-fin rays (16-18), in combination with the number of gill rakers on the first arch (4-5) and some proportional measurements. Phenacorhamdia taphorni is diagnosed by the possession of multicuspid jaw teeth and fewer vertebrae (39). Morphological evidence supporting a previous hypothesis of phylogenetic affinities of Phenacorhamdia within heptapterids is discussed as well as the relationships of the new species described herein. Apomorphic tooth shape of P. taphorni supports a less inclusive clade within Phenacorhamdia, comprising this species and two undescribed forms of the Mamoré and Paraná basins, respectively. /// Se realizó una revisión taxonómica de las especies venezolanas de Phenacorhamdia y se registraron tres species: P. anisura, descrita originalmente para el Río San Juan, cuenca del Golfo de Paria; P. provenzanoi, especie nueva, ampliamente distribuida en la cuenca del Orinoco y P. taphorni, especie nueva, restringida a la cuenca alta del Río Apure. Phenacorhamdia anisura es redescrita con base en material topotípico y un gran número de ejemplares provenientes de diferentes localidades a lo largo de la cuenca del Orinoco, expandiendo tanto la variabilidad morfológica, así como la distribución de la especie, previamente documentadas. Phenacorhamdia anisura tiene una amplia distribución, simpátrica e incluso sintópica con P. provenzanoi en la cuenca del Orinoco, y es la única especie del género encontrada en la cuenca del Golfo de Paria. Phenacorhamdia anisura es diferenciada de sus congéneres por la combinación de barbilla maxilar alcanzando tres cuartos a lo largo de la aleta pectoral, barbilla mentoniana externa no alcanzando la base de la aleta pectoral, 5-7 branquispinas en el primer arco, 41-43 vértebras, nueve costillas pleurales, aleta pectoral modalmente con siete radios ramificados, primer radial basal de la aleta dorsal insertado posterior a las vértebras 11-12, aleta anal con 12-15 radios (7-9 ramificados), lóbulos de la aleta caudal puntiagudos, lóbulo superior de la aleta caudal con siete radios ramificados, lóbulo inferior de la aleta caudal marcadamente más largo que el lóbulo superior, pigmentación del cuerpo uniforme y algunas medidas proporcionales. Phenacorhamdia provenzanoi es diagnosticada por el elevado número de vértebras (47-48) y radios de la aleta anal (16-18), en combinación con el número de branquispinas del primer arco branquial (4-5) y algunas medidas proporcionales. Phenacorhamdia taphorni es diagnosticada por la presencia de dientes mandibulares multicúspides y por el menor número de vértebras (39). Evidencia morfológica soportando una hipótesis previa acerca de las afinidades filogenéticas de Phenacorhamdia dentro de heptaptéridos es discutida así como también las relaciones de las especies nuevas descritas aquí. La forma apomórfica de los dientes de P. taphorni soporta un clado menos inclusivo dentro de Phenacorhamdia, conformado por esta especie y dos formas no descritas de las cuencas del Mamoré y del Paraná, respectivamente.
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|a Copyright 2008 Academy of Natural Sciences of Philadelphia
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| 650 |
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|a Biological sciences
|x Biology
|x Anatomy
|x Body tissues
|x Connective tissues
|x Bones
|x Spine
|x Vertebrae
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Hydrology
|x Tributaries
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Anatomy
|x Body tissues
|x Connective tissues
|x Bones
|x Spine
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Biological taxonomies
|x Taxa
|x New taxa
|x New species
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Geologic provinces
|x Structural basins
|x River basins
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| 650 |
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4 |
|a Business
|x Industry
|x Industrial sectors
|x Manufacturing industries
|x Consumer goods industries
|x Clothing industry
|x Clothing
|x Clothing accessories
|x Jewelry
|x Pectorals
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Zoology
|x Animals
|x Fish
|x Catfish
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Anatomy
|x Digestive system
|x Mouth
|x Teeth
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plant morphology
|x Plant vegetation
|x Stems
|x Peduncle
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Anatomy
|x Body tissues
|x Connective tissues
|x Bones
|x Ribs
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| 655 |
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4 |
|a research-article
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| 700 |
1 |
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|a Milani, Nadia
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Proceedings of the Academy of Natural Sciences of Philadelphia
|d Academy of Natural Sciences of Philadelphia, 1841
|g 157(2008) vom: Juli, Seite 163-180
|w (DE-627)477991068
|w (DE-600)2174963-2
|x 19385293
|7 nnns
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| 773 |
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|g volume:157
|g year:2008
|g month:07
|g pages:163-180
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|u http://dx.doi.org/10.1635/0097-3157(2008)157[163:TVSOPS]2.0.CO;2
|3 Volltext
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|d 157
|j 2008
|c 07
|h 163-180
|