Jon Shoemaker

Date of Award


Degree Name

Master of Arts


Biological Sciences

First Advisor

Dr. Edwin B. Steen

Second Advisor

Dr. Thane S. Robinson

Third Advisor

Dr. Jackson Davis

Fourth Advisor

Dr. Richard Brewer

Access Setting

Masters Thesis-Open Access



During the period extending from September, 1959 to July, 1960, 553 snails, of the species Campeloma decisum, were collected from Portage Creek in the southeast corner of the SE 1/4, Sec. 34, T. 2 S., R. 11 W., Kalamazoo County, Michigan. Metacercariae, closely related to Leucochloridiomorpha constantiae of the monotypic genus, Leucohloridiomorpha, were found in the uteri of several snails. Subsequent studies showed the metacercariae to be an undescribed species. Life history studies showed that this form developed experimentally in the chicken and domestic duck. In this paper stages in the life cycle are described.

Allison (19430, after his preliminary report (1940), discussed in detail the life cycle of L. constantiae. He removed the family Brachylaemidae from the Prosostomata, placed it in the order Strigeatoidea, and erected the superfamily Brachylaemoidea. Allison (op. cit.) also emended the diagnoses of the family Brachylaemidea, subfamily Brachylaeminae, genus Leucochloridiomorpha, and species constantiae.

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