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Butlerodon
Taxonomy
Butlerodon was named by Mao et al. (2022). Its type is Butlerodon quadratus.
It was assigned to Kermackodontidae by Mao et al. (2022).
It was assigned to Kermackodontidae by Mao et al. (2022).
Species
B. quadratus (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Butlerodon Mao et al. p. 6 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Mao et al. 2022 | Unique in having an enlarged b1 cusp that makes the mesial portion of m1 square-shaped. Differs from Thomasia, Haramiyavia and Theroteinus in having more cusps on upper and lower molars, of which A1 and a1 are distinctively large, respectively, while other cusps are proportionally small; both upper and lower molars proportionally wide and broadly basined with cusps arranged around the basin, contrasting with the blunt tooth cusps that are closely positioned on the tooth crown in the other three taxa; development of Ax cusp on upper molar. Further differs from Theroteinus in having more mesiodistally elongate molars with two distinctive longitudinal rows of cusps that define a longitudinal central valley on upper and lower molars. Differs from K. oxfordensis in the upper and lower molars having a more rectangular outline in occlusal view, contrasting with the rhomboidal and spindle-like outline for upper and lower molars, respectively, of K. oxfordensis; lower molar with fewer tooth cusps, a1 not extending mesially, upper molar with weakly developed cusp row Ax, cusp AA not buccally extended and also bites into the valley of lower molar. The combination of several tooth structures, such as a distinct cusp b1, a1 not mesially extended, and initial development of row Ax on the upper molar, differentiate Butlerodon from other “haramiyidans”, including Arboroharamiya, Shenshou, Xianshou, Vilevolodon, Maiopatagium, Sineleutherus, Avashishta, Hahnodon, Denisodon, Mojo, Kirtlingtonia, Cifelliodon and Sharypovoia, among which some have only one tooth or a partial tooth preserved (see Mao & Meng 2019a and Averianov et al. 2019a for a review of these taxa). Differs from Megaconus in having basined molar with conical cusps. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hopson 1973, Carroll 1988, Luo et al. 2003, Hendy et al. 2009 | |||||
Age range: Late/Upper Bathonian or 167.70000 to 164.70000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Bathonian | United Kingdom (England) | B. quadratus, Kermackodon sp. (224639) |