Abstract
The currently accepted abdominal chaetotaxy for the strawberry aphid Chaetosiphon fragaefolii is zero to one submarginal setae, whereas for C. thomasi it is seven to eight submarginal setae. Intermediates having two to six setae are common. The number and position of submarginal setae were determined for aphids collected from three locations in the Pacific Northwest, and the setal patterns of these aphids' parthenogenetic offspring were determined for several generations. Setal number and position were highly variable between siblings and generations. Either “species” readily produced offspring with setal numbers of the opposite “species.” These results suggest that a separation of C. fragaefolii and C. thomasi based on setal number may not be valid.
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