First report of Ilyocryptus paranaensis inarmatus Kotov, Elíaz-Gutiérrez & Gutiérrez-Aguirre, 2001 (Cladocera, Anomopoda, Ilyocryptidae) in South America

• Published in: Brazilian journal of biology Vol. 71; no. 4; pp. 1025 - 1026
• Main Authors: Sousa, F.D.R, Elmoor-Loureiro, L.M.A
• Format: Journal Article
• Language: English
• Published: São Carlos Association of the Brazilian Journal of Biology 01-11-2011; Instituto Internacional de Ecologia
• Subjects: Anomopoda; Aquatic ecosystems; Aquatic plants; Cladocera; Freshwater; Ilyocryptus; Ilyocryptus paranaensis inarmatus; South America; Argentina; Mexico; Argentina, Parana R. basin
• ISSN: 1519-6984; 1678-4375; 1519-6984; 1678-4375
• DOI: 10.1590/s1519-69842011000500024

Ilyocryptus paranaensis Paggi 1989 was described initially from the Parana River basin, Argentina (Paggi, 1989) and is distinguished from other neotropical Ilyocryptids by complete molting and the presence of a horn-like protuberance on each valve. This taxon is composed of two subspecies: Ilyocryptus paranaenis paranaensis Paggi 1989 and Ilyocryptus paranaensis inarmatus Kotov, Elias- Gutierrez & Gutierrez-Aguirre, 2001 the latter reported only for the basin of the Usumacinta River, Mexico (Kotov and Stifter, 2006). During an inventory of cladocerans in streams of the Brazilian Cerrado, the authors observed the occurrence of Ilyocryptus paranaensis inarmatus, representing the first record for South America. The present record expands the occurrence of I. paranaensis inarmatus, which was originally thought to be restricted (Kotov et al., 2001). Furthermore, the difference observed in the number of basal denticles on the postabdomen suggests that studies on intra- and interpopulational variability are necessary in order to achieve a better understanding of the I. paranaensis subspecies.