Abstract

QUINTELA, Fernando M.; SANTOS, Maurício B.; GAVA, Adriana  and  CHRISTOFF, Alexandre U.. Notes on morphology, geographic distribution, natural history, and citogenetics of Cryptonanus guahybae (Didelphimorphia: Didelphidae). Mastozool. neotrop. [online]. 2011, vol.18, n.2, pp.247-257. ISSN 0327-9383.

This article reports data on karyotype, geographic distribution, habitat occurrence and morphometry of Cryptonanus guahybae (Tate, 1931) based on 15 specimens deposited in the mammal collection of the Museu de Ciências Naturais of Universidade Luterana do Brasil. The specimens were recorded in the following localities in Rio Grande do Sul state: 1. Itá Hydroelectric Power Plant; 2. Derrubadas; 3. Aracuri Ecological Station - Esmeralda (Southern Plateau); 4. Tapes (Inner Coastal Plain); 5. Venâncio Aires (Central Depression) and 6. Lagoa Verde Reserve Area and surroundings - Rio Grande (External Coastal Plain). We amplified the extension of the species distribution ca. 100 km southwards and 250 km northwards, being the municipalities of Derrubadas and Rio Grande, respectively, the new northern and southern limits of its geographical range. Derrubadas municipality record also extends C. guahybae distribution ca. 180 km westwards. Cytogenetic analysis showed a diploid number of 2n=14 and fundamental number FN=24 with pairs 1, 2 and 3 being submetacentrics, pair 4 metacentric, pairs 5 and 6 subtelocentrics, while sexual chromosomes X and Y were a submetacentric and an acrocentric, respectively. Ag-NOR analysis showed a single region located in the short arms of pair 6. In relation to habitat occurrence, the specimens from Rio Grande municipality were recorded in restinga forest, occupying the inner or borderline of sandy riparian forest and inner and gaps of flooded forest. Individuals were trapped on the ground and in short trees (heights = 0.5 - 1.55 m).

Keywords : Cranial morphology; Geographic distribution; Habitat; Karyology; Thylamyini.

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