词汇 | dentary |
释义 | BETA Examples of dentarydentary isn’t in the Cambridge Dictionary yet. You can help! The earliest sauropods retained the buccal emargination and lateral ridge, coarsely serrated lanceolate teeth, 18 or more dentary teeth, and a relatively unexpanded symphysis. There is no evidence for the attachment of a rhamphotheca at the rostral end of the dentary. The anterior section of the right mandible, which is preserved isolated from the skull, begins at the symphysis and includes parts of the dentary, splenial and anterior coronoid. Marginal teeth on the maxilla and dentary are approximately of equal size and do not decrease in size posteriorly as far as they are preserved. This specimen includes a dentary with teeth. A dentary tusk and tusk pit are present but there is no parasymphyseal tooth row. Most of the bones lie in horizontal position but a vertically orientated dentary and rib have been observed. The dentary is long and slender and is dorsoventrally tallest at its caudal margin. This taxon demonstrates that basal sauropods possessed a fleshy cheek associated with a buccal emargination and a lateral ridge on the dentary. The symphysis is formed mainly by the dentary with a small ventral contribution from the splenial. The teeth on the dentary and posterior coronoid are largely embedded in matrix but the following information can be gleaned. The dentary and angulo-articular appear to be disarticulated from each other. The third tooth-bearing bone may be a badly distorted dentary. On the margo dorsolateralis of the right dentary, 15 protuberances are preserved. Note the triangular depression behind the anterior palatal vacuity, and part of the right dentary tusk in (b). A single pointed tooth is visible anteriorly, along the dorsal margin of the dentary. This structure is associated with a ridge on the dentary and large nutritive foramina on the lateral surface of this element and the maxilla. |
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