Acherontiscus caledoniae, the earliest heterodont and durophagous tetrapod

Clack, Jennifer A. and Ruta, Marcello and Milner, Andrew R. and Marshall, John E. A. and Smithson, Timothy R. and Smithson, Keturah Z. (2019) Acherontiscus caledoniae, the earliest heterodont and durophagous tetrapod. Royal Society Open Science, 6 (5). ISSN 2054-5703

Full content URL: https://doi.org/10.1098/rsos.182087

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Abstract

The enigmatic tetrapod Acherontiscus caledoniae from the Pendleian stage of the Earl Carboniferous shows heterodontous and durophagous teeth, representing the earliest known examples of significant adaptations in tetrapod dental morphology. Tetrapods of the Late Devonian and Early Carboniferous (Mississippian), now known in some depth, are generally conservative in their dentition and body morphologies. Their
teeth are simple and uniform, being cone-like and sometimes recurved at the tip. Modifications such as keels occur for the first time in Early Carboniferous Tournaisian tetrapods. Acherontiscus, dated as from the Pendleian stage, is notable for being very small with skull length of about 15 mm, having an elongate vertebral column, and being limbless. Cladistic analysis places it close to the Early Carboniferous adelospondyls, aïstopods, and colosteids, and supports the hypothesis of ‘lepospondyl’ polyphyly. Heterodonty is associated with a varied diet in tetrapods, while durophagy suggests a diet that includes hard tissue such as chitin or shells. The mid-Carboniferous saw a significant increase in morphological innovation among tetrapods, with an expanded diversity of body forms, skull shapes, and dentitions appearing for the first time.

Keywords:Early Carboniferous, earliest Serpukhovian (‘Namurian’), adelospondyls, aïstopods, colosteids, ‘lepospondyl’ polyphyly
Subjects:C Biological Sciences > C100 Biology
C Biological Sciences > C182 Evolution
C Biological Sciences > C300 Zoology
C Biological Sciences > C181 Biodiversity
F Physical Sciences > F600 Geology
F Physical Sciences > F641 Palaeontology
Divisions:College of Science > School of Life Sciences
ID Code:35568
Deposited On:11 Apr 2019 15:29

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