New Pseudophyllidean Cestodes from the Great Lakes Region. I. Diphyllobothrium oblongatum n. sp. from Gulls

Abstract

D. oblongatum*, a small tapeworm from young gulls, was obtained from natural infections and by feeding stomach cysts from herring, Leucichthys artedi, to incubator-reared, fledgling gulls. A detailed study is made of the morph. of the worm in an attempt to find critical data for the separation of species. Many early descr. of small tapeworms belonging to the genus Diphyllobothrium are too inadequate to even allow comparisons. Measurements alone do not suffice. It is impossible to lump them all under "dwarf" D. latum, infecting birds and mammals as subsequent papers will point out.