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Bridetherium dorisae
Taxonomy
Bridetherium dorisae was named by Clemens (2011). Its type specimen is BMNH M45693, a tooth (left lower mesial molariform), and it is a 3D body fossil. Its type locality is Pant 4 (St. Bride's Island), which is in a Hettangian/Sinemurian fissure fill limestone/marl in the United Kingdom. It is the type species of Bridetherium.
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Bridetherium dorisae Clemens p. 1141 figs. 1-3 |
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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.
†Bridetherium dorisae Clemens 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. A. Clemens 2011 | A morganucodontan (sensu Kielan-Jaworowska et al. 2004) differing from species of Morganucodon in the larger size of cusps e and g. Cusp g usually situated lingual to cusp a, not distolingual. Unlike M. watsoni, a cingular cusp (cusp i in Pacey’s (1978) terminology, which is adopted here) usually is present lingual to cusp d and contacted the following molariform between its cusps b and e. Differing from Megazostrodon and Dinnetherium, in that the buccal cingulum of the upper molariforms is continuous and lacks relatively large mesial and distal cingular cusps. Resembles Dinnetherium in the greater height of cusps A and a relative to crown length. Molariforms lack development of apical expansion of their roots, which is typical of Morganucodon watsoni and possibly other species of this genus. Cusp a produced a deep wear facet on the buccal side of cusp B and cusp c produced a similarly deep facet on the buccal side of cusp A. By contrast, cusp a of morganucodontids occluded between cusps A and B, while in megazostrodontids, cusp a occluded into the embrasure between adjacent upper molars (families sensu Kielan-Jaworowska et al. 2004). Lacks wrinkled enamel surfaces of molariforms of Brachyzostrodon, Wareolestes and Helvetiodon. Unlike Gondwanadon and Indotherium, the principal cusps (A and a) are distinctly larger than the other principal cusps. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Luo et al. 2003, Carroll 1988, Hendy et al. 2009 | |||||
Age range: base of the Hettangian to the top of the Sinemurian or 201.30000 to 190.80000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hettangian - Sinemurian | United Kingdom (Wales) | Bridetherium dorisae (type locality: 46137) |