title: Teratological Nymphal Ixodes scapularis (Acari: Ixodidae)  From Wisconsin.
abstract: Abnormalities of physiological development (teratological forms) in ticks are rare. The occurrence of gigantism, dwarfism, gynandromorphs, missing legs, extra legs, and asymmetries is most often reported from lab-reared specimens, but has been observed in field-collected specimens. All morphologically anomalous ticks (besides gynandromorphy) described to date are from species other than Ixodes scapularis Say (Acari: Ixodidae). Here we describe four teratological I. scapularis nymphs collected while dragging vegetation in Wisconsin in 2015, including two asymmetrical ticks, one with a missing leg, and one with an extra leg.
authors.forename: Scott R
authors.initials: SR
authors.lastname: Larson
authors.forename: Susan M
authors.initials: SM
authors.lastname: Paskewitz
mesh_terms: D000818:Animals; D000013:Congenital Abnormalities; D018884:Ixodes / Q000033:anatomy & histology*; D009758:Nymph / Q000033:anatomy & histology; D014922:Wisconsin