Karyotypes of eight species of Leptodactylus (Anura, Leptodactylidae) with a description of a new karyotype for the genus - Amaro-Ghilardi, Renata Cecília; Skuk, Gabriel; Sá, Rafael O. de; Rodrigues, Miguel Trefaut; Yonenaga-Yassuda, Yatiyo (Phyllomedusa, 2006)