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.Facultad de Ciencias Naturales y Muse

Azpelicueta, María de las Mercedes

Koerber, S.

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Check List 10(5): 1210–1212, 2014
© 2014 Check List and Authors
ISSN 1809-127X (available at www.checklist.org.br)
Parotocinclus collinsae Schmidt & Ferraris 1985; some years after, the accessory teeth were also observed by many authors in different genera and species: Reis & Schaefer 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. Eurycheilichthys pantherinus (Reis & Schaefer, 1992) lives in the Uruguay River basin and E. 
limulus Reis & Schaefer, 1998 inhabits the upper basin of the Jacuí River. Recent samples revealed the presence of E. 
pantherinus in a small stream of the Uruguay River basin, 
in the province of Misiones. Thus, this is the first record of the species in the middle Uruguay of Argentina.The specimens examined were collected in the arroyo 
Garibaldi near San Pedro City (approx. 26°53′00″ S, 
54°05′01″ W), a headwater of the arroyo Yabotí Guazú 
which flows into the Uruguay river (Figures 1 and 2). The stream has very clear, rapidly streaming water and stony bottom. The specimens were collected only in the rapids.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 collected specimens have these characteristics, although, one of the two cleared 
and stained specimens has a large accessory flange in the 
ceratobranchial. The males have a fleshy flap along the 
posterior margin of the thickened first pelvic-fin rays. 
Eurycheilichthys pantherinus also has an accessory series of unicuspid teeth in the maxilla and dentary not associated with the common bicuspid teeth. Reis and Schaefer (1992) commented that this type of unicuspid teeth appears in 
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.
1 Museo de La Plata, Conicet, Paseo del Bosque s/n, 1900 La Plata, Argentina. 2 Friesenstraße 11, 45476 Muelheim, Germany.* Corresponding author. E-mail: azpeli@fcnym.unlp.edu.ar
María de las Mercedes Azpelicueta 1* and Stefan Koerber 2
First record of the hypoptopomatine genus 
Eurycheilichthys Reis & Schaefer, 1993 (Siluriformes, Loricariidae) from Argentina
DOI: 10.15560/10.5.1210
Figure 1. Habitat where Eurycheilichthys pantherinus was collected: Arroyo Garibaldi, Misiones, Argentina.
Figure 2. The new locality in the arroyo Garibaldi, Misiones, Argentina, is 
indicated with a green dot; the other dots indicate the previously known 
localities in Brazil. Pink dot is the type locality: Rio Grande do Sul, creek tributary of rio dos Touros (Reis & Schaefer, 1998).
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Azpelicueta and Koerber | First record of Eurycheilichthys from Argentina(1998) in Epactionotus; Schaefer & Provenzano (1998) in Niobichthys; Gauger & Buckup (2005) in Parotocinclus 
bidentatus and P. muriaensis; Lehmann (2006) in juveniles of Parotocinclus maculicauda, and Martins & Langeani (2011) in Rhinolekos schaeferi (see also Martins et al., 2014).Measurements and counts of 10 specimens are 
provided in Table 1. Measurements were taken following Reis and Schaefer (1992). The examined specimens of E. 
pantherinus (Figure 3) have lower number of lateral plates; the counts of all remaining plates agree with those of Reis and Schaefer (1992). The specimens have been deposited 
in the following collections: CI-FML 5875 (6), CI-FML 5876 (2 c&s), and MCP 48035 (2). Institutional abbreviations follow Sabaj-Pérez (2012).The ground color in live specimens is pale brown with 
numerous dark brown blotches irregularly arranged on head and dorsum (Figure 4). The blotches on the head are roundish and smaller than those of the body, which are completely irregular in size and shape. The blotches 
usually form four conspicuous dorsal bands, first located at 
the base of the anterior dorsal-fin rays, second at the end of 
the dorsal-fin base, third after the length of the adpressed 
dorsal fin, and the last near the origin of the caudal-fin 
rays. All fins have brown blotches, but membranes are hyaline. Sometimes, the blotches form faint bands in the 
dorsal, pectoral, and caudal fins.
Acknowledgments: We thank J. Milillo for the donation of specimens and the permit to use his photographs of the collecting site and the live specimens; James J. Thompson (United Kingdom) for improvement the English style; Google Earth et al. for making the satellite image available to the public.
Literature cited
Gauger, M.F.W. and P.A. Buckup 2005. Two new species of Hypoptopomatinae from the rio Paraíba do Sul basin, with comments on the monophyly of Parotocinclus and the Otothyrini (Siluriformes: Loricariidae). Neotropical Ichthyology 3(4): 509–518. (doi: 10.1590/S1679-62252005000400008).Lehmann, P.A. 2006. Anatomia e relações filogenéticas da família 
Loricariidae (Ostariophysi: Siluriformes) com ênfase na subfamília 
Hypoptopomatinae. Tese de Doutorado, PUCRS,Rio Grande do Sul, Brazil. (http://hdl.handle.net/10923/5444).Martins, F.O. and F. Langeani 2011. Rhinolekos, a new genus with three 
Figure 4. Live Eurycheilichthys pantherinus recently collected.
Figure 3. Euricheilichthys pantherinus, lateral, dorsal, and ventral views. CI-FML 5875, 31.2 mm SL.
MEAN MIN MAX
Standard length 29.72                33.61
Percentage of SLHead length 36.0 33.2 37.6Predorsal length 47.4 45.6 48.4
Unbranched dorsal-fin length 47.4 45.6 48.4
Unbranched anal-fin length 17.2 15.2             18.7Pectoral-spine length 25.3 23.9       26.5
Unbranched pelvic-fin length   9.6 17.3 22.3
Trunk length 16.0 14.2 17.3Abdominal length 24.3 23.0 25.5Cleithral width 31.0 30.1 32.0
Body depth at dorsal-fin origin 16.1 15.2 18.4
Width at anal-fin origin 14.7 13.2 15.3Caudal-peduncle length 31.6 29.8 32.0Caudal-peduncle depth  8.7  7.2  8.8
Percentage of HeadSnout length 53.3 51.9 56.9Orbital diameter 16.3 14.4 18.2Interorbital width 33.2 31.8 36.1Head depth 44.2 41.5 48.7Left mandibula width 13.0 12.7 15.8
Counts
Branched dorsal-fin rays 7 7 7
Branched pectoral-fin rays 7 7 7
Branched pelvic-fin rays 5 5 5
Branched caudal-fin rays 14 14 14Left lateral plates 23 21 23Right lateral plates 23 22 24
Table 1. Measurements and counts of 10 specimens of Eurycheilichthys 
pantherinus from the arroyo Garibaldi, Misiones, Argentina. Length and width measurements in mm.
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Azpelicueta and Koerber | First record of Eurycheilichthys from Argentina
new species of Hypoptopomatinae (Siluriformes: Loricariidae) from upper Rio Paraná. Neotropical Ichthyology 9(1): 65–78 (doi: 10.1590/S1679-62252011000100004).
Martins, F.O., H.A. Britski and F. Langeani. 2014. Systematics of 
Pseudotothyris (Loricariidae: Hypoptopomatinae). Zoological Journal 
of the Linnean Society 170: 822–874 (doi: 10.1111/zoj.12107).Reis, R.E. and S.A. Schaefer. 1992. Eurycheilus pantherinus (Siluroidei: Loricariidae), a new genus and species of Hypoptopomatinae from southern Brazil. Copeia 1992(1): 215–223 (doi: 10.2307/1446554).Reis, R.E. and S.A. Schaefer. 1993. Eurycheilichthys nom. nov., a substitute name for Eurycheilus Reis and Schaefer, 1992 (Siluroidei: Loricariidae). Copeia 1993(3): 894 (doi: 10.2307/1447263).Reis, R.E. and S.A. Schaefer. 1998. New Cascudinhos from southern Brazil: Systematics, endemism, and relationships (Siluriformes, Loricariidae, Hypoptopomatinae). American Museum Novitates 3254: 
1–25 (http://hdl.handle.net/2246/3154).Sabaj Pérez, M.H. 2012. Standard symbolic codes for institutional resource 
collections in herpetology and ichthyology: An Online Reference. Version 2012.3. Accessible at http://www.asih.org/sites/default/
files/documents/Resources/collabbrv30sabajperez23feb2012.pdf. Captured on 3 September 2013.Schaefer, S.A. & F. Provenzano R., 1998. Niobichthys ferrarisi, a new genus 
and species of armored catfish from southern Venezuela (Siluroidei: Loricariidae). Ichthyological Exploration of Freshwaters 4: 39–56.
Received: March 2014
Accepted: August 2014
Published online: October 2014
Editorial Responsibility: Tiago Carvalho
 


First record of the hypoptopomatine genus Eurycheilichthys Reis & Schaefer, 1993 (Siluriformes, Loricariidae) from Argentina

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First record of the hypoptopomatine genus Eurycheilichthys Reis & Schaefer, 1993 (Siluriformes, Loricariidae) from Argentina

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