Abstract
A cytogenetic study performed on a population of the South American leptodactylid frog Eleutherodactylus maussi revealed multiple sex chromosomes of the X1X1X2X2♀/X1X2Y♂ (=XXAA♀/XXAY♂) type. The diploid chromosome number is 2n=36 in all females and 2n=35 in most males. The multiple sex chromosomes originated by a centric fusion between the original Y chromosome and a large autosome. In male meiosis the X1X2Y (=XXAY) multiple sex chromosomes form a classical trivalent configuration. E. maussi is the first species discovered in the class Amphibia that is distinguished by a system of multiple sex chromosomes. Only one single male was found in the population with 2n=36 chromosomes and lacking the Y-autosomal fusion. This karyotype (XYAA♂) is interpreted as the ancestral condition, preceding the occurrence of the Y-autosome fusion.
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by H.C. Macgregor
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Schmid, M., Steinlein, C. & Feichtinger, W. Chromosome banding in amphibia. Chromosoma 101, 284–292 (1992). https://doi.org/10.1007/BF00346007
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DOI: https://doi.org/10.1007/BF00346007