Abstract
The hypoptopomatine genus Eurycheilichthys was so far considered to be endemic to the South of Brazil. One of its species, E. pantherinus, was described from the upper Uruguay river basin. We inform about the finding of this species within the Garibaldi creek, headwater of the arroyo Yabotí Guazú. This is the first record for Argentina which is found in a tributary of the middle Uruguay river.
Highlights
The species included in the subfamily Hypoptopomatinae have a wide distribution from the Orinoco basin to the Rio de la Plata, with the largest number of small bodied hypoptopomatine genera distributed in Southeastern Brazil
Reis and Schaefer (1992) described E. pantherinus by the possession of several characteristics: an apomorphic character seven branched pectoral-fin rays; presence of greatly expanded lower lip (Figure 3); accessory ceratobranchial flange reduced to a slender uncinate process; loss of filamentous gill rakers from the oral surfaces of the hyoid skeleton; and very wide body, with cleithral width 27.5–31.8% SL
The specimens have been deposited in the following collections: CI-FML 5875 (6), CI-FML 5876 (2 c&s), and MCP 48035 (2)
Summary
The Neotropical family Loricariidae is the largest within the Siluriformes and contains six subfamilies. The species included in the subfamily Hypoptopomatinae have a wide distribution from the Orinoco basin to the Rio de la Plata, with the largest number of small bodied hypoptopomatine genera distributed in Southeastern Brazil. Among the genera present in Southern Brazil, Eurycheilichthys Reis & Schaefer, 1993 is considered until now endemic to mountain rivers of Rio Grande do Sul State, occurring above 600 m of altitude.
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