Museum, University of Nebraska State


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BULLETIN OF The University of Nebraska State Museum, VOLUME 11, NUMBER 3 OCTOBER,1989


Copyright © by the Board of Regents of the University of Nebraska


Adult specimens of all 19 North American species of papillose allocreadiids were examined. A description and figure is given for the adult of each species; details of the cirrus sacs are presented for most spesies for the first time. Descriptions were emended where necessary and judgments were made on synonymies. Scanning electron micrographs of the oral sucker of 10 species are presented as is a new key to the 19 species. A cladistic analysis was performed on the group based on adult characters. The analysis indicated that the group is monophyletic on the basis of the ventral papillae associated with the oral sucker, and the following genera were substantiated: Bunodera Railliet, 1896, Bunoderella Schell, 1964, Crepidostomum Braun, 1900, and Paracreptotrematina Amin and Meyer, 1982. All available literature on the larval forms is summarized. Miracidial development was monitored in 5 species; scanning electron micrographs are presented for cercariae of 5 species, and indicate that all species possess filiform protrusions around the oral aperture and papillae on the margin of the acetabulum. Independent cladistic analyses were atrempted for miracidial and cercarial data. No miracidial characters were appropriate for the analysis, but a cercarial tree is presented. This study represents the first attempt at generation of independent cladograms for separate life cycle stages at the species level. The cercarial tree was congruent but not identical to the cladogram generated from adult data. A consensus tree summarizing both cercarial and adult morphological data is presented. Based on the monophyly of the group, it is recommended that all 19 species be placed in a single subfamily, Bunoderinae.