Observations on Hybridization of Three Species of North American Dermacentor Ticks

Female Dermacentor andersoni Stiles confined on the host with male D. variabilis (Say) later produced infertile eggs, whereas the reciprocal cross sometimes yielded progeny of both sexes. Meiotic chromosome pairing, karyokinesis, and cytokinesis in some of these hybrid males suggest various degrees...

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