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Title: Multiple global radiations in tadpole shrimps challenge the concept of 'living fossils'.
Authors: Mathers, T. C.
Hammond, Robert L.
Jenner, R. A.
Hänfling, B.
Gómez, A.
First Published: 2-Apr-2013
Publisher: PeerJ
Citation: PeerJ, 2013, 1, pp. e62
Abstract: 'Living fossils', a phrase first coined by Darwin, are defined as species with limited recent diversification and high morphological stasis over long periods of evolutionary time. Morphological stasis, however, can potentially lead to diversification rates being underestimated. Notostraca, or tadpole shrimps, is an ancient, globally distributed order of branchiopod crustaceans regarded as 'living fossils' because their rich fossil record dates back to the early Devonian and their morphology is highly conserved. Recent phylogenetic reconstructions have shown a strong biogeographic signal, suggesting diversification due to continental breakup, and widespread cryptic speciation. However, morphological conservatism makes it difficult to place fossil taxa in a phylogenetic context. Here we reveal for the first time the timing and tempo of tadpole shrimp diversification by inferring a robust multilocus phylogeny of Branchiopoda and applying Bayesian divergence dating techniques using reliable fossil calibrations external to Notostraca. Our results suggest at least two bouts of global radiation in Notostraca, one of them recent, so questioning the validity of the 'living fossils' concept in groups where cryptic speciation is widespread.
DOI Link: 10.7717/peerj.62
ISSN: 2167-8359
eISSN: 2167-8359
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright 2013 Mathers et al. Distributed under Creative Commons CC-BY 3.0
Description: PMCID: PMC3628881 The following information was supplied regarding the deposition of related data: Dryad: DOI 10.5061/dryad.77bt2
Appears in Collections:Published Articles, Dept. of Biology

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