Developmental cranial osteology of three species of Rana (Anura) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fq977w991

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  • Developmental series of Rana pretiosa (110 specimens), R. cascadae (100 specimens) and R. aurora (115 specimens) were bone stained and cleared in glycerin. The growth and developmental patterns of the skull and selected bones were followed from the first appearance of bone through adult stages. The sequential appearance of the bones was determined, and the number of teeth on the premaxillae, maxillae and prevomers were counted separately. The developmental pattern of the skull and individual bones was similar in the three species although size and growth pattern differences were evident. The sequential appearance of cranial bones was similar in all species, except that the frontoparietal, parasphenoid, and exoccipital appeared three stages earlier in the larger R. pretiosa and R. aurora. Although considerable variation was noted, the number of teeth showed consistent differences throughout development.
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