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Comparative Ontogeny Of Cranial Ossification In The Spotted Salamander, Ambystoma Maculatum, And The Tailed Frog, Ascaphus Truei, Michael Keith Moore
Comparative Ontogeny Of Cranial Ossification In The Spotted Salamander, Ambystoma Maculatum, And The Tailed Frog, Ascaphus Truei, Michael Keith Moore
LSU Historical Dissertations and Theses
The ontogenetic sequence of ossification of the cranium, including descriptions of the development of individual elements, from initial appearance of bone through adulthood, is described for two species of amphibian: the Spotted Salamander, Ambystoma maculatum, and the Tailed Frog, Ascaphus truei. This study is based on cleared-and-stained developmental series of 269 specimens of Ambystoma and 325 of Ascaphus. Nine stages of cranial development are defined for Ambystoma maculatum. By metamorphosis, all bones of the skull of Ambystoma except the articular have begun to ossify. The ossification sequence of Ambystoma shows little interindividual variation; only 6 specimens do not follow the …