Abstract
ABSTRACT A new species of Odontocharacidium is described from the upper Río Orinoco basin, in Venezuela. The new species is distinguished from its only congener, Odontocharacidium aphanes, by the presence of: the antorbital, the parietal branch of the supraorbital laterosensory canal, the postcleithrum 1, the conspicuous bars extending ventrally below the middle portion of the body posteriorly, and two dark round blotches at the tip of the caudal peduncle. With the recognition of an additional species of Odontocharacidium the diagnostic characters of the genus and the variability in the number of maxillary teeth in specimens are discussed.
Highlights
Odontocharacidium Buckup is a miniature representative of the Crenuchidae, a moderately diverse Neotropical family containing 95 valid species distributed in 11 genera and two subfamilies (Fricke et al, 2020)
All measurements are presented as proportions of standard length (SL), except for subunits of the head, which are presented as proportions of the head length (HL)
Museo de Historia Natural La Salle (MHNLS) 26156, 14.7 mm SL, Venezuela, Río Negro Municipality, Río Orinoco, Caño Chola, where it crosses the road from San Carlos de Río Negro to Solano, 1°58’00”N 67°00’00”W, 11 Apr 1985, R.P
Summary
Odontocharacidium Buckup is a miniature representative of the Crenuchidae, a moderately diverse Neotropical family containing 95 valid species distributed in 11 genera and two subfamilies (Fricke et al, 2020). Odontocharacidium was diagnosed from the other crenuchids by: 1) absence of posttemporal; 2) absence of the supratemporal laterosensory canal; 3) absence of the pterotic laterosensory canal, and 4) pterotic, parietal and sphenotic lacking dermal portions between the semicircular canals, with the posttemporal fossa limited anteriorly by the sphenotic; 5) absence of postcleithrum 1 (Buckup, 1993b) In addition to these characters, the genus can be recognized by the lack of conspicuous dark pigmentation on the median portions of the pectoral and pelvic fin-rays, and the lack of a conspicuous black blotch on the posterior margin on the adipose fin (Buckup, van der Sleen, 2018). The genus included only its type species, Odontocharacidium aphanes (Weitzman, Kanazawa) from the rio Negro in the Amazon basin (Weitzman, Kanazawa, 1977), but during a revisionary study of the genus, a new species from the Río Orinoco in Venezuela was detected among museum samples, and is described
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