Филогенез и таксономия электрических рыб рода Hypopygus с описанием 5 новых видов

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Филогенез и таксономия электрических рыб рода Hypopygus с описанием 5 новых видов

Сообщение Yan » Вт ноя 29, 2011 8:38 am

Hypopygus hoedemani
Hypopygus isbruckeri
Hypopygus minissimus
Hypopygus nijsseni
Hypopygus ortegai

de Santana & Crampton, 2011
A phylogenetic reconstruction of the Neotropical electric fish genus Hypopygus based on 47 parsimony-informative morphological characters is presented. A series of synapomorphies support the hypothesis of monophyly of Hypopygus, and partially resolve species-level relationships within the genus. Hypopygus species are recognized here as miniaturized fishes based on two criteria; first, a derived condition of diminutive body size, and; second, the presence of a suite of reductive morphological characters, including partial or total losses, simplifications, and reductions of the anal-fin rays, scales, cranial bones, and laterosensory canal system. Reductive characters associated with miniaturization comprise 45% of the total number of characters in the phylogenetic reconstruction of the genus. Miniaturization and reductive morphological evolution in Hypopygus are discussed here in the phylogenetic context. A taxonomic revision of Hypopygus is presented, in which five new species are described, two species previously assigned to the genus are redescribed, and a single known species of Stegostenopos is redescribed and included in Hypopygus as a junior synonym. Distribution maps and a key for all eight valid species of Hypopygus are provided, based on the examination of 5014 catalogued museum specimens.
Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes)
C.D. de Santana & W.G.R. Crampton
Zoological Journal of the Linnean Society, 163: 1096–1156, 2011.
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