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A Devonian tetrapod-like fish reveals substantial parallelism in stem tetrapod evolution
Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, POB 643, Beijing 100044, Peoples R China.;Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.ORCID iD: 0000-0001-9054-2900
Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, POB 643, Beijing 100044, Peoples R China.;Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China..
Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, POB 643, Beijing 100044, Peoples R China..
2017 (English)In: Nature Ecology & Evolution, E-ISSN 2397-334X, Vol. 1, no 10, p. 1470-1476Article in journal (Refereed) Published
Abstract [en]

The fossils assigned to the tetrapod stem group document the evolution of terrestrial vertebrates from lobe-finned fishes. During the past 18 years the phylogenetic structure of this stem group has remained remarkably stable, even when accommodating new discoveries such as the earliest known stem tetrapod Tungsenia and the elpistostegid (fish-tetrapod intermediate) Tiktaalik. Here we present a large lobe-finned fish from the Late Devonian period of China that disrupts this stability. It combines characteristics of rhizodont fishes (supposedly a basal branch in the stem group, distant from tetrapods) with derived elpistostegid-like and tetrapod-like characters. This melange of characters may reflect either detailed convergence between rhizodonts and elpistostegids plus tetrapods, under a phylogenetic scenario deduced from Bayesian inference analysis, or a previously unrecognized close relationship between these groups, as supported by maximum parsimony analysis. In either case, the overall result reveals a substantial increase in homoplasy in the tetrapod stem group. It also suggest that ecological diversity and biogeographical provinciality in the tetrapod stem group have been underestimated.

Place, publisher, year, edition, pages
2017. Vol. 1, no 10, p. 1470-1476
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-345273DOI: 10.1038/s41559-017-0293-5ISI: 000417192000014PubMedID: 29185516OAI: oai:DiVA.org:uu-345273DiVA, id: diva2:1189194
Funder
Swedish Research Council, 2014-4102Knut and Alice Wallenberg FoundationAvailable from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-03-09Bibliographically approved

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Ahlberg, Per E.

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