Abstract

How the eggs and larbae of the Utah amphibians differ from each other is the problem to be considered in this paper. Certain problems are yet to be answered. One problem is that the larvae of Rana pretiosa subsp. From utah fit the description of the Nevada form, Rana pretiosa luteiventris, as described by Thompson (1913) and not the description of Rana pretiosa pretiosa as set forth by Svihla (1935). Another problem is that the adults, tadpoles, and eggs of Rana pipiens brachycephala and Rana onca are strikingly similar. Rana fisheri of the Las Vegas Valley in nevada and Rana onca are rather similar. There are fourteen species of utah amphibians. Only twelve of these will be considered here as two species are comparatively rare and material was unobtainable for this study. Variations from previous descriptions of some of the eggs and tadpoles are noted therein. A description of the eggs and tadpoles of Rana onca, Bufo woodhousii microscaphus, Ambystoma tigrinum nebulosum, the eggs of Scaphiopus hammondii intermontanus and the tdpoles of Bufo boreas boreas are advanced for the first time.

Degree

College and Department

Life Sciences; Plant and Wildlife Sciences

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