File:Tylosaurus Plotosaurus cranial kinesis.svg
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Summary
| Description |
English: Evolutionary adaptations in cranial kinesis among mosasaurs, showing a typical seven-joint kinesis and streptostyly in an early mosasaur (Tylosaurus nepaeolicus) and the specialized rigid akinesis featuring the loss of many joints in a highly derived mosasaur (Plotosaurus bennisoni) in (A) resting (B) protracting (C) retracting positions. Darkened circles correspond to each joint and red arrows correspond to the movement of bones along them.
Legend: Premaxilla Maxilla Dentary Splenial Angular Prefrontal Frontal Parietal Palatine? (shown in Plotosaurus only) Pterygoid Ectopterygoid (shown in Plotosaurus only) Jugal Postorbitofrontal Coronoid Squamosal Surangular Articular Supratemporal (shown in Plotosaurus only) Paraoccipital process (shown in Plotosaurus only) Quadrate Braincase
Reference: Tylosaurus nepaeolicus and Plotosaurus bennisoni skulls adapted from Everhart (2005)[1] and LeBlanc et al. (2013) respectively.[2] Movement of joints based on Russell (1967)[3] and LeBlanc et al. (2013).[2] |
| Date | |
| Source | Own work |
| Author | Macrophyseter |
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- ↑ (2005). "Tylosaurus kansasensis, a new species of tylosaurine (Squamata, Mosasauridae) from the Niobrara Chalk of western Kansas, USA". Netherlands Journal of Geosciences 84 (3): 231–240. DOI:10.1017/S0016774600021016.
- ↑ a b (2013). "Aquatic adaptation, cranial kinesis, and the skull of the mosasaurine mosasaur Plotosaurus bennisoni". Journal of Vertebrate Paleontology 33 (2): 349-362. DOI:10.1080/02724634.2013.726675.
- ↑ Russell, D.A. (1967) Systematics and morphology of American mosasaurs, 23, Bulletin of the Peabody Museum of Natural History, pp. 1–124. Archived from the original on 21 October 2022. Retrieved on 7 August 2022.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:47, 7 August 2022 | | 3,827 × 3,366 (899 KB) | Macrophyseter | Uploaded own work with UploadWizard |
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