Abstract
Karyotypes of 23 lines of screwworm, Cochliomyia hominivorax (Coquerel), flies originating as isofemale lines collected in the Mexican states of Colima, Michoacan, Oaxaca, Chiapas, Quintana Roo, and one line from the island of Jamaica were investigated. Detailed analysis of metaphase I meiotic chromosomes from male primary spermatocytes revealed differences between lines having the longest and shortest means for percentage of total chromosome length of the X and Y chromosomes, but no significant differences in the five autosomes. Comparison of mean arm ratios for the five autosomes among strains indicated no significant differences for autosomes II, III, IV, and VI. The F test for autosome V was significant. Analysis of karyotypes of 55 between-line hybrids to detect chromosome rearrangements showed that no isofemale lines possessed chromosome rearrangements. Results do not indicate existence of reproductive isolation between any of the lines, or differences indicative of more than intraspecific variation in karyotypes.
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