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Russellosaurus
Taxonomy
Russellosaurus was named by Polcyn and Bell (2005).
It was assigned to Russellosaurina by Bell and Polcyn (2005) and Polcyn and Bell (2005); to Tethysaurinae by Makádi et al. (2012); and to Yaguarasaurinae by Palci et al. (2013) and Driscoll et al. (2019).
It was assigned to Russellosaurina by Bell and Polcyn (2005) and Polcyn and Bell (2005); to Tethysaurinae by Makádi et al. (2012); and to Yaguarasaurinae by Palci et al. (2013) and Driscoll et al. (2019).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Russellosaurus Bell and Polcyn p. 189 |
| 2005 | Russellosaurus Polcyn and Bell p. 322 |
| 2012 | Russellosaurus Makádi et al. |
| 2013 | Russellosaurus Palci et al. |
| 2019 | Russellosaurus Driscoll et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Russellosaurus Polcyn and Bell 2005
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†Russellosaurus coheni Polcyn and Bell 2005
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. J. Polcyn and G. L. Bell 2005 | Small, lightly built mosasaur, frontal narrow with a length to width ratio of 1.6:1. Sixteen maxillary teeth and 16 dentary teeth. Anterior premaxilla broad and blunt, in dorsal view the premaxillary-maxillary suture is oblique. The ectopterygoid lightly built and comprised of a distinct small subrectangular pterygoid process and a slender rod-like jugal process. Incipient emargination of the frontal by the external nares. A pair of foramina separated by a thin median septum in the floor of the basioccipital are interpreted as the entrance of the basilar artery, and exit the ventral surface of the basioccipital as multiple small and anteriorly placed foramina. Extreme downgrowth of the pterygoid processes of the basisphenoid. Lightly built postorbitofrontal processes. The pineal foramen is located in the centre of the triangular parietal table. The supraoccipital loose cartilaginous contact with parietal. Median cleft in posterior parietal margin in dorsoventral aspect. |
Measurements
No measurements are available
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| Source: f = family, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Carroll 1988, Hendy et al. 2009, Gervais 1852 | |||||
Age range: Middle Turonian or 93.50000 to 89.30000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Turonian | USA (Texas) | R. coheni (93824) |