The karyotypes of three platymantine frogs, Platymantis hazelae and P. dorsalis from Philippines and P. papuensis from Papua New Guinea, were described and compared. P. hazelae has 2n = 26 chromosomes consisting of five large and eight small pairs, as in many other species of Ranidae. The karyotypes of P. dorsalis (2n = 20) and P. papuensis (2n = 22) may be derived from the basic karyotype of 2n = 26. Simple fusions and pericentric inversions explain the karyotypic relationships between P. hazelae and P. papuensis, while the karyotype of P. dorsalis seems to have resulted from more complicated chromosome rearrangements.
Satoshi Tanaka and Mitsuru Kuramoto
Hareesh Joshy and Mitsuru Kuramoto
The shape and size of spermatozoa of 11 frog species from India and Sri Lanka were examined by scanning electron microscopy. The spermatozoa of the genera Limnonectes and Euphlyctis were of the generalized type with a thick sperm head and a thin tail, whereas Indirana semipalmata had peculiar spermatozoa with a densely coiled sperm head and a thick tail. Rhacophorus microtympanum is likely to belong to the genus Philautus from sperm morphology. The spermatozoa of Microhyla ornata and Ramanella obscura were very similar, with a cone-shaped sperm head and a thin tail.