Karyological relationships between the Cryptobranchid salamanders |
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Authors: | A. Morescalchi G. Odierna E. Olmo |
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Affiliation: | (1) Institute of Histology and Embryology, The University, Faculty of Sciences, via Mezzocannone 8, I-80134 Napoli, (Italy) |
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Abstract: | Summary The 3 living Cryptobranchids (Andrias japonicus, A. davidianus andCryptobranchus alleganiensis) show 2n=60 and nuclear DNA amounts of respectively 92.9, 100.1 and 112.5 pg. Karyologically, the 2 genera differ in the morphology of 2 chromosome pairs. The hypotheses are advanced that either theCryptobranchus karyotype is derived from that ofAndrias through an unequal translocation, or the karyotypes of both genera are derived from that of a common (perhaps hynobiid) ancestor with at least 62 chromosomes.Research supported by a contribution from the Italian C.N.R. |
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