Abstract
Odontophrynus americanus has 2n=44 chromosomes in somatic and gonad cells which can be ordered in 11 groups of homologues. In spermatocytes I they form mostly ring quadrivalents. In metaphase II 22 dyads are present. There is no indication of abnormalities in ♂ and ♀ gonad development.
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Beçak, M.L., Beçak, W. & Rabello, M.N. Cytological evidence of constant tetraploidy in the bisexual South American frog Odontophrynus americanus. Chromosoma 19, 188–193 (1966). https://doi.org/10.1007/BF00293683
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DOI: https://doi.org/10.1007/BF00293683