No abstract

Karyotypes of eight species of Leptodactylus (Anura, Leptodactylidae) with a description of a new karyotype for the genus. Eight species of the Neotropical genus Leptodactylus were karyologically studied:

Tadpoles of Chiasmocleis alagoanus were collected from a temporary pond in a remnant of Atlantic Forest, municipal district of Maceió, Alagoas, Brazil. The tadpole presents lentic and nektonic habit. Body triangular in lateral view and oval in dorsal view; snout truncate in lateral, dorsal and ventral view. Eyes lateral and nostrils absent. Spiracle medial with wide opening. Anal tube ventral and short, with central opening, without free margin. Oral opening terminal, with marginal papillae and jaw sheaths absent, with the superior semicircular labial flaps suspended on the extremities of the mouth. Tooth rows absent. Tail length representing 59.1% of total length. In preservative the body is brown light and the viscera is partially visible. Notes on the environment and comparison with other tadpoles of the genera are provided.

Comparative cytogenetic studies based on conventional staining, CBG‐banding, RBG‐banding, and Ag‐NOR staining, were performed on three species of Liolaemus: L. occipitalis, L. lutzae and L. wiegmannii. The three species have 2n = 34, with closely similar karyotypes and an XX:XY mechanism of sex determination. The cytogenetic analysis allowed the detection of differences among the macrochromosomes of the three species and some other features characteristic of each species. The karyotype of L. occipitalis and the banding patterns of L. lutzae and L. wiegmannii have not been reported previously.

Among a series of eight specimens of