Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 42 (1935) > Annual Issue
Document Type
Research
Abstract
A comparative study of the reproductive systems of four species of Iowa hawks shows that the right ovary may be entirely lacking or persistent to a degree which may be functional. The right oviduct is either absent or vestigial. An embryological examination of Cooper's hawk shows that there is little or no migration of the primordial germ cells from right to left, as has been reported for other species, notably the English sparrow, the red-winged blackbird and the chick - and correspondingly less asymmetry in the reproductive system. The Falconiformes on this basis are assumed to represent a phylogenetic step between the reptilian stem and the higher birds.
Publication Date
1935
Journal Title
Proceedings of the Iowa Academy of Science
Volume
42
Issue
1
First Page
208
Last Page
208
Copyright
©1935 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Stanley, Allan J.
(1935)
"Embryology and Anatomy of Iowa Hawks with Special Reference to the Reproductive System,"
Proceedings of the Iowa Academy of Science, 42(1), 208-208.
Available at:
https://scholarworks.uni.edu/pias/vol42/iss1/98