A live female crayfish; Orconectes immunis (Hagen) exhibiting unusual body coloration was given to the biology laboratories at the University of Northern Iowa for study. Its right half, including antennae and other appendages, was colored an azure blue; the left half was colored normally. This bilateral coloration mosaicism persisted following molting. Gynandromorphism as a corollary factor is eliminated on the basis that no apparent external sexual intergradation of sexual dimorphism was noticeable. Somatic mutation in early embryonic development is the most likely explanation. A mutation in a gene affecting some aspect of the biochemical synthesis pathway in pigmentation seems to be operative.
Proceedings of the Iowa Academy of Science
©1969 Iowa Academy of Science, Inc.
Dowell, Virgil E. and Winier, Leonard P.
"A Bilateral Color Anomaly in the Crayfish, Orconectes immunis (Hagen),"
Proceedings of the Iowa Academy of Science, 76(1), 487-492.
Available at: https://scholarworks.uni.edu/pias/vol76/iss1/64