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A partial lower jaw...
A partial lower jaw of a tetrapod from "Romer's Gap"
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- Chen, Dong Lei, 1985- (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi
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- Alavi, Yasaman (författare)
- Univ Melbourne, Sch BioSci, Australia
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- Brazeau, Martin D. (författare)
- Imperial Coll London, Dept Life Sci, Berks, England
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- Blom, Henning, 1969- (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi
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- Millward, David (författare)
- British Geol Survey, Lyell Ctr, Edinburgh, Midlothian, Scotland
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- Ahlberg, Per E., 1963- (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: Earth and environmental science transactions of the Royal Society of Edinburgh. - 1755-6910 .- 1755-6929. ; 108:1, s. 55-65
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The first half of the Mississippian or Early Carboniferous (Tournaisian to mid-Visean), an interval of about 20 million years, has become known as "Romer's Gap" because of its poor tetrapod record. Recent discoveries emphasise the differences between pre-"Gap" Devonian tetrapods, unambiguous stem-group members retaining numerous "fish" characters indicative of an at least partially aquatic lifestyle, and post-"Gap" Carboniferous tetrapods, which are far more diverse and include fully terrestrial representatives of the main crown-group lineages. It seems that "Romer's Gap" coincided with the cladogenetic events leading to the origin of the tetrapod crown group. Here, we describe a partial right lower jaw ramus of a tetrapod from the late Tournaisian or early Visean of Scotland. The large and robust jaw displays a distinctive character combination, including a significant mesial lamina of the strongly sculptured angular, an open sulcus for the mandibular lateral line, a non-ossified narrow Meckelian exposure, a well-defined dorsal longitudinal denticle ridge on the prearticular, and a mesially open adductor fossa. A phylogenctic analysis places this specimen in a trichotomy with Crassigyrinus and baphetids + higher tetrapods in the upper part of the tetrapod stem group, above Whatcheeria, Pederpes, Ossinodus, Sigournea and Greererpeton. It represents a small but significant step in the gradual closure of "Romer's Gap".
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Early Carboniferous
- fossil
- palaeontology
- Tantallon Castle
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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