Two Gynandromorphs of Ixodes scapularis (Acari: Ixodidae) from New York State

Gynandromorphism, the simultaneous occurrence of both male and female genotypic and morphological characteristics in a single individual of a normally sexually dimorphic species, is rare in ticks. The phenomenon is documented previously for free-living specimens representing several tick genera, particularly Amblyomma and Hyalomma, but only rarely in Ixodes. Here we describe the first two known gynandromorphs of the blacklegged tick, Ixodes scapularis Say, collected while flagging vegetation during routine tick surveillance in the Hudson Valley region of New York State. Uniquely, both specimens display some morphological features typical of nymphs, in addition to those of both males and females.