Nymph deer ticks have only fed once in their life and have less of a chance of carrying a disease than adult deer ticks who have fed twice. Knowing which life stage a deer tick is in helps to determine risk of disease. Understanding the difference in size between the adult and nymph deer ticks is an important part of identification. Actual Size of the Adult Female and Nymph Deer Ticks Deer ticks (Ixodes scapularis) will have an anal groove that extends above the anus while other species of tick not in the genus Ixodes will have an anal groove that stays below the anus. Used as an identifying characteristic to determine tick species.Īnal Groove: Used to identify species of tick. Spiracular Plate: Has glands that may be involved in regulation of water loss and air diffusion. Genital Aperture: Where the adult male tick will insert his hypostome to mate and fertilize the adult female tick. This characteristic can be useful in identifying tick species.Ĭoxa I-IV: Attach the trochanter of the leg to the body of the tick. Deer ticks will have trochanters without spurs. Trochanter: Part of the leg that attaches to the coxa. These characteristics are used in identifying the species. ![]() The basis capituli of a deer ticks will be straight at the bottom where it connects to the body and will be missing rounded humps on the top on either side of the hypostome. Deer ticks have black, oblong shields.īasis Capituli: Attaches the mouthparts to the body. Only nymph and adult female deer ticks will have a shield located on the top portion of the back. Scutum/Shield: Used as an identifying characteristic to determine tick life stage, species, and sex. Adult female deer ticks will have smaller porose areas than other tick species. Porose area of Basis Capituli: Used as an identifying characteristic to determine tick species. Adult males will use the hypostome to fertilize adult females. ![]() Hypostome: Barbed mouthpart injected into host to suck blood.
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