Abstract
The male and female diploid complements in Mytilicola are formed both by 22 chromosomes. Two different somatic metaphase figures are found: with two minute-size chromosomes and with three minute-size chromosomes. The study of meiosis has shown that the female sex is heterogametic. The chromosome complement is 10II+XX in the male and 10II+XY in the female. A bivalent formed by two different-length homologues, is to be seen in the female meiosis at pachytene; it shows, sometimes, a light positive hetero-pycnosis.
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References
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Orlando, E. Heterochromosomes in Mytilicola intestinalis Steuer (Copepoda). Genetica 44, 244–248 (1973). https://doi.org/10.1007/BF00119109
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DOI: https://doi.org/10.1007/BF00119109