Fig. 1
From: Double anus in an Ixodes scapularis nymph, a medically important tick vector
Scanning electron micrographs of the Ixodes scapularis nymph with two anuses and a normal nymph with a single anus. a, b Abnormal tick. Ventral side of whole tick (a) and enlarged portion of the same tick (b) with two anuses. c, d Normal tick. Ventral side of whole tick (c) and enlarged portion of the same tick (d) with one anus. Scale bar: a, c 500 µm, b, d 100 µm. Ag Anal groove