Thursday, April 19, 2018

[Ichthyology • 2018] Hemibrycon iqueima • A New Species of Hemibrycon (Characiformes, Characidae, Stevardiinae) from the upper Magdalena River Basin in Colombia

Hemibrycon iqueima 
García‐Melo, Albornoz‐Garzón, García‐Melo, Villa‐Navarro & Maldonado‐Ocampo, 2018

  DOI: 10.1111/jfb.13634 

Hemibrycon iqueima sp. nov., is described from small streams in the Magdalena drainage at the foothills of the western slope of the Eastern Cordillera of the Colombian Andes, Suarez municipality, Tolima Department, Colombia. The new species is distinguished from its congeners in the Magdalena–Cauca River basin by a combination of characters related to snout–anal‐fin origin length, head length, dorsal–pectoral fin distance, dorsal‐fin–hypural distance, postorbital distance, orbital diameter, snout length, number of total vertebrae, pre‐dorsal scales, scale rows between anal‐fin origin and lateral line, number of branched rays of the anal fin, maxillary teeth number and number and arrangement of hooks on the branched rays of the pectoral and dorsal fins. In addition, the validity of this species is supported by previous molecular analyses that included specimens of the new species that had been erroneously identified. Phylogenetic relationships between the new species and congeners from Pacific coast basins are discussed.

Key words: biodiversity; ichthyology; morphological visualization; Neotropical fishes; Stevardiinae; taxonomy

FIG. 1. Hemibrycon iqueima sp. nov., Quebrada Bacallá, upper Magdalena River basin, Suárez Municipality, Tolima Department, Colombia. Holotype CZTU-IC 16418, 57.3 mm standard length, preserved coloration.
(a) Lateral view, (b) dorsal view, (c) ventral view. Scale bar 10 mm.  

 FIG. 4. Lateral view of cleared and stained skeleton of Hemibrycon iqueima sp. nov. CZUT-IC 11920, 40.9 mm standard length. Scale bar 10 mm.

Hemibrycon iqueima sp. nov.

Distribution and habitat: Hemibrycon iqueima is known from three small tributaries (Batatas, Yeguas, Bacallá) in the upper Magdalena River basin, draining the western slope of the Eastern Cordillera (Figs 5 and 6).  

 Etymology: The specific epithet is a noun in apposition referring to Cacique Iqueima, a name belonging to the indigenous Los Panches and Tolimas tribes that inhabited the type locality region. The tribes inhabited land near to the Magdalena River south-west of Cundinamarca and north-east of Tolima. 

J. E. García‐Melo, J. G. Albornoz‐Garzón, L. J. García‐Melo, F. A. Villa‐Navarro and J. A. Maldonado‐Ocampo. 2018. A New Species of Hemibrycon (Characiformes, Characidae, Stevardiinae) from the upper Magdalena River Basin in Colombia. Journal of Fish Biology.  DOI: 10.1111/jfb.13634

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