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Durlstodon ensomi
Taxonomy
Durlstodon ensomi was named by Sweetman et al. (2017). Its type specimen is NHMUK PV M 99992, a tooth, and it is a 3D body fossil. Its type locality is Mammal Bed, Durlston Bay (DB83), which is in a Berriasian marine horizon in the Lulworth Formation of the United Kingdom. It is the type species of Durlstodon.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Durlstodon ensomi Sweetman et al. figs. Figs. 3-6 |
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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.
†Durlstodon ensomi Sweetman et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. C. Sweetman et al. 2017 | Monotypic tribosphenic mammal with a unique combination of derived characters. Differs from stem therians including Juramaia and Acristotherium, from the Oxfordian and Barremian of China respectively, but resembles Late Cretaceous eutherians, particularly members of Zhelestidae (sensu Archibald and Averianov 2012) in: height and expan- sion of the protocone relative to labial cusps; possession of conules placed labially immediately adjacent to the paracone and metacone with sharp internal cristae; protocone antero- posteriorly expanded and similar in height to the metacone; conular region width more than 51% of the total molar width (c. 64%); lower molars with a substantial entoconid as evidenced by a wear facet on the distal side of the protocone. Differs from members of Zhelestidae in possession of a paracone that is substantially taller than the protocone and metacone. Differs from Durlstotherium gen. nov. in: the presence of a rectangular trigon basin with internal conular cristae rather than a triangular trigon basin lacking these; in the more expanded protocone lacking any apical constriction; in presence of an angled postprotocrista (exaggerated by wear); in possession of an apparently more robust paraconule (possibly exaggerated by wear); in greater separation and relative sizes of the paracone and metacone; possession of a cuspidate ectocinglum; absence of pre- and postcingulum; pattern of wear (see below); and greater size. Other characters cannot be determined due to loss of the mesiolabial corner of the tooth. |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Lillegraven 1979, Ji et al. 2002, Carroll 1988 | |||||
Age range: Middle Berriasian or 141.00000 to 139.10000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Berriasian | United Kingdom (England) | Durlstodon ensomi (type locality: 72142) |