Chromosome evolution in Dendropsophini (Amphibia: Anura: Hylinae)

SUÁREZ, P.; CARDOZO, D.; BALDO, D.; PEREYRA, M.O.; FAIVOVICH, J.; ORRICO, V.G.D.; CATROLI, G.F.; GRABIELE, M.; BERNARDE, P.S.; NAGAMACHI, C.Y.; HADDAD, C.F.B.; PIECZARKA, J.C.

CYTOGENETIC AND GENOME RESEARCH

KARGER

Lugar: Basel; Año: 2013 vol. 141 p. 295 - 308

1424-8581

Dendropsophini is the most species rich tribe within Hylidae with 234 described species. Although cytogenetic information is sparse, chromosome numbers and morphology have been considered as an important character system for systematic inferences in this group. Using a diversity of standard and molecular techniques, we describe the previously unknown karyotypes of the genera Xenohyla, Scarthyla, and Sphaenorhrynchus, and provide new information on Dendropsophus and Lysapsus. Our results reveal significant karyotype diversity among Dendropsophini, with diploid numbers ranging from 2n = 22 in Scarthyla goinorum, 2n = 24 in Lysapsus, Scinax, Xenohyla, and almost all species of Sphaenorhynchus and Pseudis, 2n = 26 in Sphaenorhynchus carneus, 2n = 28 in Pseudis cardosoi, to 2n = 30 in all known Dendropsophus species. Although Nucleolar Organizer Regions (NORs) and C-Banding patterns show a high degree of variability, NORs positions in 2n = 22, 24, and 28 karyotypes, and C-banding patterns in Lysapsus and Pseudis, are informative cytological markers. Interstitial telomeric sequences reveal a diploid number reduction from 24 to 22 by a chromosome fusion event. The diploid number of Xenohyla truncata corroborates the character state of 2n = 30 as a synapomorphy of Dendropsophus.