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Double anus in an Ixodes scapularis nymph, a medically important tick vector.

Vikas Taank1, Frank A Lattanzio2, Hameeda Sultana1,3,4

  • 1Department of Biological Sciences, Old Dominion University, Norfolk, VA, USA.

Parasites & Vectors
|May 12, 2021
PubMed
Summary

This study observed a rare double anus in a nymph of the blacklegged tick (Ixodes scapularis), a vector for human diseases. This finding documents an unusual morphological abnormality in this medically important arthropod.

Keywords:
AbnormalitiesAnusIxodes scapularisMicroinjection

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Area of Science:

  • Arthropod biology
  • Medical entomology
  • Parasitology

Background:

  • Ixodes scapularis ticks are significant vectors of human pathogens.
  • Morphological abnormalities like missing legs and gynandromorphism have been documented in these ticks.
  • This study focuses on a rare anatomical variation.

Purpose of the Study:

  • To report the occurrence of a double anus in a laboratory-reared Ixodes scapularis nymph.
  • To document an unusual morphological abnormality in a medically important tick species.

Main Methods:

  • Larval ticks were reared and allowed to molt into nymphs on mice.
  • Stereo and scanning electron microscopy were used for detailed observation.

Main Results:

  • A single Ixodes scapularis nymph was found to possess two anuses.
  • The two anuses were located within a single anal groove.
  • Microscopy confirmed the presence and arrangement of the double anal structures.

Conclusions:

  • This report confirms the rare occurrence of a double anus in Ixodes scapularis.
  • The finding contributes to the understanding of morphological variations in disease vectors.