962 Journal of species lists and distribution Chec List N OTES ON G EOGRAPHIC D ISTRIBUTION Check List 10(4): 962–964, 2014 © 2014 Check List and Authors ISSN 1809-127X (available at www.checklist.org.br) Chiasmocleis Mèhelÿ, 1904 is the most diverse genus of Microhylidae, with 25 described species distributed from Panamá to Asunción in Paraguay. Chiasmocleis albopunctata (Boettger, 1885) is the most widely distributed species of the genus (Peloso et al. 2014), being present 06°00′ S in State of Tocantins, Brazil, to 25°18′ S in Asunción, Paraguay. It inhabits open vegetation areas like those of Cerrado, Chaco and the transitional areas between them, as well as transitional areas between Cerrado and Amazonian and Atlantic Forests (Peloso et al. 2014). Chiasmocleis albopunctata is characterized by its elongated body; short and rounded snout; fingers and toes lacking interdigital webbing and adhesive discs, and having a slight fringe and scarce, small dermal spines; absence of occipital fold; presence of a postorbital fold; scattered dermal spines in dorsum; coloration characterized by dark gray dorsum with a whitish bar on snout, extending along canthus rostralis, superior eyelid, and fragmented in irregular blotches on shoulders; scattered, irregularly distributed whitish blotches on dorsum, arms, legs; venter gray with large, well delimited, and irregularly distributed whitish blotches (Caramaschi and Cruz 1997) (Figure 1). We recorded 29 individuals of C. albopunctata using pitfall traps with drift-fences (Figure 2) from December 2013 to February 2014 in La Ascensión ranch, La Picadita, Municipality of Colonia Villafañe, Departmento Pirané, Province of Formosa, Argentina (26°02′16″ S, 59°09′26″ W) (Figure 3). The area corresponds to a Chaco subregion known as Humid Chaco (Chaco Húmedo) (Secretaría de Desarrollo Sustentable y Política Ambiental and Ministerio de Desarrollo Social y Medio Ambiente 1999). Vegetation in the area is a mosaic of Chaco forests intermingled with seasonally flooded areas called “bañados” and “esteros”. The specimens were identified based in the diagnostic characters provided by Caramaschi and Cruz (1997), and measured (SVL) using a digital caliper (precision of 0.01 mm). We used the minimum SVL of males (23.2 mm) and females (28.2 mm) and the presence of dark vocal sac as a diagnostic character to identify males, females and Abstract: Chiasmocleis Mèhelÿ, 1904 is the most diverse genus of Microhylidae, with Chiasmocleis albopunctata (Boettger, 1885) being the species with the largest distribution. This species is typical of open habitats from State of Tocantins in Brazil to Asunción in Paraguay, which is its southernmost previous record. Herein we report the first record of C. albopunctata in Argentina, extending its known distribution 173 km SW from Asunción in Paraguay. Laboratorio de Ecología y Conservación de la Herpetofauna, Instituto de Diversidad y Ecología Animal, (IDEA, CONICET-UNC) and Centro de Zoología Aplicada (UNC). Rondeau 798 X5000AVP Córdoba, Argentina. * Corresponding author. E-mail: nicolas.pelegrin@conicet.gov.ar José Manuel Sánchez, Giuliano Paolo Pesci, Suelem Muniz Leão and Nicolás Pelegrin* First record of the genus Chiasmocleis Mèhelÿ, 1904 (Anura, Microhylidae) in Argentina DOI: 10.15560/10.4.962 Figure 1. Dorsal and ventral view of a female Chiasmocleis albopunctata (SVL 31.96 mm) captured in La Picadita, Colonia Villafañe, Formosa, Argentina (voucher LECH00001). juveniles in our sample (data from Caramaschi and Cruz 1997). Males were identified by the dark coloration of the vocal sac. Individuals of less than 28.2 mm without dark vocal sac were classified as juveniles, while individuals larger than 28.2 mm without vocal sac were classified as females. Among the 29 individuals captured, 20 (seven males, mean SVL ±SE: 25.62 ±0.17 mm; three females, 30.21 ±0.37 mm; 10 juveniles, 20.75 ±0.69 mm) were deposited in the herpetological collection of Laboratorio de Ecología y Conservación de la Herpetofauna, Instituto de Diversidad y Ecología Animal (IDEA, CONICET-UNC) under the numbers LECH00001 to LECH00020. This is the first record of the genus Chiasmocleis for Argentina. This record extends C. albopunctata known distribution range about 173 km SW of Asunción,