Cytogenetics of Ticks (Acari: Ixodoidea) 6. Chromosomes of Dermacentor species in the United States

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Abstract
Karyotypes, sex determination and meiosis have been studied in 5 of the 7 species of Dermacentor reported from the U. S. (D. andersoni Stiles, D. variabilis Say, D. occidentalis Marx, D. parumapcrtus Neumann, D. hunteri Bishopp). All species show a diploid somatic chromosome number of 22 in females and 21 in males. In the latter, 10 autosomal bivalents and 1 sex univalent are found at metaphase I; reduction division, at least for the sex chromosomes, occurs at anaphase The centromere occurs terminally or nearly so in all chromosomes including the sex chromosome. The latter can be recognized easily in mitotic and meiotic nuclei by its being slightly longer than the longest autosome in the former cells and by its differential size, behavior, and sometimes staining reaction in the latter cells.

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