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Corydoras gladysae and Corydoras petracinii, CALVINO & ALONSO 2009
Two new species of the genus Corydoras (Ostariophysi: Siluriformes: Callichthyidae) from northwestern Argentina, and redescription of C. micracanthus Regan, 1912
Fig. 1. Corydoras gladysae sp. n., MACN 9232, live holotype, 35.0 mm SL. Argentina, Salta province, Calchaquí river (S 25° 2' 59" - W 66° 6' 25"). Photo: P. Calviño.
Authors
Pablo A. CALVIÑO & Felipe ALONSO KCA, Grupo de Estudio del Killi Club Argentino, Independencia 443, Villa Ballester CP 1653, Buenos Aires, Argentina. e-mail: pablocalvin@yahoo.com.ar; felipealonso@gmail.com
Fig. 2. Corydoras petracinii sp. n., MACN 9233, live holotype, 36.0 mm SL. Argentina, Salta province, San Lorenzo river (S 24° 47' 08'’ - W 65° 28' 10'’). Photo: P. Calviño.
Abstract
The group herein denominated as the Corydoras micracanthus species-group is supported by presenting dorsal and pectoral spines length reduced; caudal fin slightly emarginated; low body depth; parieto-supraoccipital process and nuchal plate not in contact and small eyes for the genus. It comprises Corydoras micracanthus, herein redescribed, and two new species described in the present paper, all from northwestern Argentina. Corydoras gladysae, a new species from the Calchaquí river, is distinguished from other species of the genus by the caudal-fin shape, slightly emarginated and by presenting the shortest dorsal and pectoral spines length (mean = 9.2 % and 14.8 % of SL, respectively). Corydoras petracinii, a new species from the Las Costas river, is distinguished from its congeners by the following combination of characters: dorsal spine short (mean = 16.6 % of SL), pectoral spine short (mean = 18.3 % of SL), body moderately elongate (body depth 29.5 % SL mean), caudal fin slightly forked and trunk flanks with 5–7 subsquare differenced blotches in the middle region. Corydoras micracanthus, from the Mojotoro river basin, is defined by its higher number of dorsolateral body plates (24–26) and trunk color pattern, presenting 4 to 6 subsquare blotches well differentiated in the flanks. The inclusion of these species into the genus Corydoras is discussed.
Fig. 4. Corydoras micracanthus, MACN 9234, live topotype, 35.1 mm SL. Argentina, Salta province, Gallinato creek (S 24°40’59’’ – W 65°17’32’’). Photo: P. Calviño.
PDF zum runterladen [[File:CalvioAlonso2010.pdf]]
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