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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Cristomylus
Taxonomy
Cristomylus was named by Kirkland et al. (2013). It is not extant. Its type is Cristomylus nelsoni.
It was assigned to Rhinobatoidea by Kirkland et al. (2013).
It was assigned to Rhinobatoidea by Kirkland et al. (2013).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Cristomylus Kirkland 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. †Cristomylus Kirkland et al. 2013
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†Cristomylus bulldogensis Kirkland et al. 2013
†Cristomylus cifellii Kirkland et al. 2013
†Cristomylus leptostemma Wynd et al. 2020
†Cristomylus nelsoni Kirkland et al. 2013
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. I. Kirkland et al. 2013 | Smaller than Pseudomyledaphus n. gen. and Myledaphus. Flattened sides of crown curved in dorsal view such that most upper and lower teeth have an oval appearance. Vertically, the sides of the crown are well rounded except where small wear facets are developed. The crowns bear a distinct crest on hexagonal, rhomboidal, and transitional teeth that is usually arched lingually, or less often nearly straight or weakly sinuous; crest may divide crown of tooth relatively evenly or, more commonly, closer to labial margin of the crown; crown often slightly depressed lingual to transverse crest. Symphysial teeth often appear to be flexed into a saddle shape in posterior view of the crest, with the lateral margins of the crown the tallest points. A distinct pair of lateral foramina is present on the labial side of root. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Wagner 2023 | |||||
Age range: base of the Middle Cenomanian to the top of the Early/Lower Maastrichtian or 99.60000 to 66.00000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Cenomanian - Late/Upper Cenomanian | USA (Utah) | C. bulldogensis (14385) | |
| Middle Turonian - Late/Upper Turonian | USA (Utah) | C. bulldogensis (14414) | |
| Early/Lower Campanian | USA (Utah) | C. cifellii (75840 75841) | |
| Middle Campanian | USA (Utah) | Myledaphus sp. (61844) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | USA (Colorado) | C. sp. (167302) | |
| Lancian | USA (Montana) | C. leptostemma (14549 144502) |