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A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation

A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation
A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation
Until recently the immediate aftermath of the Hangenberg event of the Famennian Stage (Upper Devonian) was considered to have decimated sarcopterygian groups, including lungfish, with only two taxa, Occludus romeri and Sagenodus spp., being unequivocally recorded from rocks of Tournaisian age (Mississippian, Early Carboniferous). Recent discoveries of numerous morphologically diverse lungfish tooth plates from southern Scotland and northern England indicate that at least 10 dipnoan taxa existed during the earliest Carboniferous. Of these taxa, only two, Xylognathus and Ballgadus, preserve cranial and postcranial skeletal elements, which have yet to be described. Here we present a description of the skull of a new genus and species of lungfish, Limanichthys fraseri gen. et sp. nov., which hails from the very earliest Tournaisian in the Ballagan Formation of Burnmouth, southern Scotland. The new specimen represents the earliest definitive Tournaisian lungfish skull material, thus providing an invaluable insight into the response of this group – and, indeed, Sarcopterygii as a whole – immediately following the latest Devonian Hangenberg event. Phylogenetic analysis places Limanichthys fraseri within the Devonian ‘phaneropleurid-fleurantiid’ grade of lungfish and shows that the Carboniferous lungfish represent forms that have their origins deep in the Middle and Late Devonian as well as those from a unique Carboniferous.
1477-2019
1-22
Challands, Tom J.
6ecde80c-64be-4bc5-a427-a929d06ee9b7
Smithson, Timothy R.
1f34d9ca-d0ee-44d7-876e-b167fef8e811
Clack, Jennifer A.
0210709c-82fb-46f9-934e-58c31bc644a1
Bennett, Carys E.
e1684f72-df39-4d08-8321-f5d512f66727
Marshall, John E. A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Wallace-johnson, Sarah M.
505db7e8-f6ea-4ccc-bebd-abca089dfa41
Hill, Henrietta
236b28ed-479c-46f6-82d6-0317191f495b
Challands, Tom J.
6ecde80c-64be-4bc5-a427-a929d06ee9b7
Smithson, Timothy R.
1f34d9ca-d0ee-44d7-876e-b167fef8e811
Clack, Jennifer A.
0210709c-82fb-46f9-934e-58c31bc644a1
Bennett, Carys E.
e1684f72-df39-4d08-8321-f5d512f66727
Marshall, John E. A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Wallace-johnson, Sarah M.
505db7e8-f6ea-4ccc-bebd-abca089dfa41
Hill, Henrietta
236b28ed-479c-46f6-82d6-0317191f495b

Challands, Tom J., Smithson, Timothy R., Clack, Jennifer A., Bennett, Carys E., Marshall, John E. A., Wallace-johnson, Sarah M. and Hill, Henrietta (2019) A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation. Journal of Systematic Palaeontology, 1-22. (doi:10.1080/14772019.2019.1572234).

Record type: Article

Abstract

Until recently the immediate aftermath of the Hangenberg event of the Famennian Stage (Upper Devonian) was considered to have decimated sarcopterygian groups, including lungfish, with only two taxa, Occludus romeri and Sagenodus spp., being unequivocally recorded from rocks of Tournaisian age (Mississippian, Early Carboniferous). Recent discoveries of numerous morphologically diverse lungfish tooth plates from southern Scotland and northern England indicate that at least 10 dipnoan taxa existed during the earliest Carboniferous. Of these taxa, only two, Xylognathus and Ballgadus, preserve cranial and postcranial skeletal elements, which have yet to be described. Here we present a description of the skull of a new genus and species of lungfish, Limanichthys fraseri gen. et sp. nov., which hails from the very earliest Tournaisian in the Ballagan Formation of Burnmouth, southern Scotland. The new specimen represents the earliest definitive Tournaisian lungfish skull material, thus providing an invaluable insight into the response of this group – and, indeed, Sarcopterygii as a whole – immediately following the latest Devonian Hangenberg event. Phylogenetic analysis places Limanichthys fraseri within the Devonian ‘phaneropleurid-fleurantiid’ grade of lungfish and shows that the Carboniferous lungfish represent forms that have their origins deep in the Middle and Late Devonian as well as those from a unique Carboniferous.

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e-pub ahead of print date: 11 March 2019

Identifiers

Local EPrints ID: 431782
URI: https://eprints.soton.ac.uk/id/eprint/431782
ISSN: 1477-2019
PURE UUID: 1083f4f9-ae22-4b83-bbcc-5927d2fa10cc
ORCID for John E. A. Marshall: ORCID iD orcid.org/0000-0002-9242-3646

Catalogue record

Date deposited: 14 Jun 2019 16:30
Last modified: 10 Dec 2019 01:59

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