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Phylogenetic Relationships of the Genus Hybognathus (Teleostei: Cyprinidae)
Timothy R. Schmidt
Vol. 1994, No. 3 (Aug. 17, 1994), pp. 622-630
Stable URL: http://www.jstor.org/stable/1447178
Page Count: 9
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Phylogenetic relationships among seven species of the cyprinid genus Hybognathus were inferred using morphological data. Monophyly of Hybognathus is supported by at least three synapomorphies: elongate anterior processes of the urohyal, enlarged epibranchials, and organization of pharyngeal papillae. Within Hybognathus, H. regius, H. hankinsoni, and a clade composed of H. placitus, H. hayi, H. nuchalis, H. argyritis, and H. amarus form an unresolved trichotomy. Members of the last clade share a reduction of the sagittal blade on the first pterygiophore of the anal fin. Within this clade, H. hayi, H. nuchalis, H. argyritis, and H. amarus form a clade supported by three modifications of the pharyngeal process of the basioccipital. Within this clade there is a monophyletic group excluding H. hayi. These three species (H. nuchalis, H. argyritis, and H. amarus) share a unique shape of the fourth epibranchial.