Highly derived eutherian mammals from the earliest Cretaceous of southern Britain
Eutherian mammals (Placentalia and all mammals phylogenetically closer to placentals than to marsupials) comprise the vast majority of extant Mammalia. Among these there is a phenomenal range of forms and sizes, but the origins of crown group placentals are obscure. They lie within the generally tin...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute of Paleobiology PAS
2017-11-01
|
| Series: | Acta Palaeontologica Polonica |
| Subjects: | |
| Online Access: | http://www.app.pan.pl/archive/published/app62/app004082017.pdf |
| _version_ | 1819102908113747968 |
|---|---|
| author | Steven C. Sweetman Grant Smith David M. Martill |
| author_facet | Steven C. Sweetman Grant Smith David M. Martill |
| author_sort | Steven C. Sweetman |
| collection | DOAJ |
| description | Eutherian mammals (Placentalia and all mammals phylogenetically closer to placentals than to marsupials) comprise the vast majority of extant Mammalia. Among these there is a phenomenal range of forms and sizes, but the origins of crown group placentals are obscure. They lie within the generally tiny mammals of the Mesozoic, represented for the most part by isolated teeth and jaws, and there is strongly conflicting evidence from phenomic and molecular data as to the date of origin of both Eutheria and Placentalia. The oldest purported eutherians are Juramaia from the Upper Jurassic of China, and Eomaia and Acristatherium from the Lower Cretaceous, also of China. Based on dental characters and analyses of other morphological and molecular data, doubt has recently been cast on the eutherian affinities of the Chinese taxa and consequently on the date of emergence of Eutheria. Until now, the only tribosphenic mammal recorded from the earliest Cretaceous (Berriasian) Purbeck Group of Britain was the stem tribosphenidan Tribactonodon. Here we document two new tribosphenic mammals from the Purbeck Group, Durlstotherium gen. nov. and Durlstodon gen. nov., showing highly derived eutherian molar characters that support the early emergence of this clade, prior to the Cretaceous. |
| first_indexed | 2024-12-22T01:42:02Z |
| format | Article |
| id | doaj.art-7d602d3eedb54cb58b671e642f6c57af |
| institution | Directory Open Access Journal |
| issn | 0567-7920 1732-2421 |
| language | English |
| last_indexed | 2024-12-22T01:42:02Z |
| publishDate | 2017-11-01 |
| publisher | Institute of Paleobiology PAS |
| record_format | Article |
| series | Acta Palaeontologica Polonica |
| spelling | doaj.art-7d602d3eedb54cb58b671e642f6c57af2022-12-21T18:43:11ZengInstitute of Paleobiology PASActa Palaeontologica Polonica0567-79201732-24212017-11-0162465766510.4202/app.00408.2017Highly derived eutherian mammals from the earliest Cretaceous of southern BritainSteven C. Sweetman0Grant Smith1David M. Martill2University of Portsmouth, School of Earth and Environmental Sciences, Burnaby Building, Burnaby Road, Portsmouth, PO1 3QL, UKUniversity of Portsmouth, School of Earth and Environmental Sciences, Burnaby Building, Burnaby Road, Portsmouth, PO1 3QL, UKUniversity of Portsmouth, School of Earth and Environmental Sciences, Burnaby Building, Burnaby Road, Portsmouth, PO1 3QL, UKEutherian mammals (Placentalia and all mammals phylogenetically closer to placentals than to marsupials) comprise the vast majority of extant Mammalia. Among these there is a phenomenal range of forms and sizes, but the origins of crown group placentals are obscure. They lie within the generally tiny mammals of the Mesozoic, represented for the most part by isolated teeth and jaws, and there is strongly conflicting evidence from phenomic and molecular data as to the date of origin of both Eutheria and Placentalia. The oldest purported eutherians are Juramaia from the Upper Jurassic of China, and Eomaia and Acristatherium from the Lower Cretaceous, also of China. Based on dental characters and analyses of other morphological and molecular data, doubt has recently been cast on the eutherian affinities of the Chinese taxa and consequently on the date of emergence of Eutheria. Until now, the only tribosphenic mammal recorded from the earliest Cretaceous (Berriasian) Purbeck Group of Britain was the stem tribosphenidan Tribactonodon. Here we document two new tribosphenic mammals from the Purbeck Group, Durlstotherium gen. nov. and Durlstodon gen. nov., showing highly derived eutherian molar characters that support the early emergence of this clade, prior to the Cretaceous.http://www.app.pan.pl/archive/published/app62/app004082017.pdfMammaliaEutheriadentitionEarly CretaceousPurbeck GroupBritainUK |
| spellingShingle | Steven C. Sweetman Grant Smith David M. Martill Highly derived eutherian mammals from the earliest Cretaceous of southern Britain Acta Palaeontologica Polonica Mammalia Eutheria dentition Early Cretaceous Purbeck Group Britain UK |
| title | Highly derived eutherian mammals from the earliest Cretaceous of southern Britain |
| title_full | Highly derived eutherian mammals from the earliest Cretaceous of southern Britain |
| title_fullStr | Highly derived eutherian mammals from the earliest Cretaceous of southern Britain |
| title_full_unstemmed | Highly derived eutherian mammals from the earliest Cretaceous of southern Britain |
| title_short | Highly derived eutherian mammals from the earliest Cretaceous of southern Britain |
| title_sort | highly derived eutherian mammals from the earliest cretaceous of southern britain |
| topic | Mammalia Eutheria dentition Early Cretaceous Purbeck Group Britain UK |
| url | http://www.app.pan.pl/archive/published/app62/app004082017.pdf |
| work_keys_str_mv | AT stevencsweetman highlyderivedeutherianmammalsfromtheearliestcretaceousofsouthernbritain AT grantsmith highlyderivedeutherianmammalsfromtheearliestcretaceousofsouthernbritain AT davidmmartill highlyderivedeutherianmammalsfromtheearliestcretaceousofsouthernbritain |