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1a.)  Coxae I lacks distinct spurs

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1b.)  Coxae I has 1 or 2 spurs

2

2.)  Palp articles free (division visible)

3

3a.)  Median plate almost as wide as long

Ixodes hexagonus

3b.)  Median plate length 1.5x width

4

4a.)  Tarsus I with marked hump near tip

Ixodes ventalloi

4b.)  Tarsus I tapers and lacks hump near tip

5

5.)  Coxae I with external and internal spurs

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6.)  Internal spur of coxae I very long

Ixodes ricinus / Ixodes persulcatus

7.)  Palps relatively large; as long as width of basis;  dorsal basis appears rectangular in shape.  Coxae I has a short internal spur

 

Ixodes canisuga

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