Abstract
A presumed XY chromosome pair is described fromt estis squashes from the mesopelagic deep-sea fish Bathylagus wesethi, whose 2N chromosome number was determined as 34-“XY”. Although the metacentric “X-chromosome” is the largest in the entire compliment, the “Y” is the smallest and only acrocentric element. The positive heteropycnosis of the sex elements was not easily distinguishable in the nuclei of first meiotic prophase. Tetraploid nuclei were observed in peripheral supporting cells of the testis. Males of at least two other congeners have similar karyotypes.
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Chen, T.R., Ebeling, A.W. Probable male heterogamety in the deep-sea fish Bathylagus wesethi (Teleostei: Bathylagidae). Chromosoma 18, 88–96 (1966). https://doi.org/10.1007/BF00326446
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DOI: https://doi.org/10.1007/BF00326446