Tags

Type your tag names separated by a space and hit enter

Multiple global radiations in tadpole shrimps challenge the concept of 'living fossils'.
PeerJ 2013; 1:e62P

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.

Authors+Show Affiliations

School of Biological, Biomedical and Environmental Sciences, University of Hull , Hull , UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23638400

Citation

Mathers, Thomas C., et al. "Multiple Global Radiations in Tadpole Shrimps Challenge the Concept of 'living Fossils'." PeerJ, vol. 1, 2013, pp. e62.
Mathers TC, Hammond RL, Jenner RA, et al. Multiple global radiations in tadpole shrimps challenge the concept of 'living fossils'. PeerJ. 2013;1:e62.
Mathers, T. C., Hammond, R. L., Jenner, R. A., Hänfling, B., & Gómez, A. (2013). Multiple global radiations in tadpole shrimps challenge the concept of 'living fossils'. PeerJ, 1, pp. e62. doi:10.7717/peerj.62.
Mathers TC, et al. Multiple Global Radiations in Tadpole Shrimps Challenge the Concept of 'living Fossils'. PeerJ. 2013;1:e62. PubMed PMID: 23638400.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multiple global radiations in tadpole shrimps challenge the concept of 'living fossils'. AU - Mathers,Thomas C, AU - Hammond,Robert L, AU - Jenner,Ronald A, AU - Hänfling,Bernd, AU - Gómez,Africa, Y1 - 2013/04/02/ PY - 2013/02/20/received PY - 2013/03/14/accepted PY - 2013/5/3/entrez PY - 2013/5/3/pubmed PY - 2013/5/3/medline KW - Bayesian analysis KW - Biogeography KW - Divergence time KW - Diversification KW - Fossil KW - Lepidurus KW - Notostraca KW - Triops KW - ‘Living fossil’ SP - e62 EP - e62 JF - PeerJ JO - PeerJ VL - 1 N2 - '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. SN - 2167-8359 UR - https://www.unboundmedicine.com/medline/citation/23638400/Multiple_global_radiations_in_tadpole_shrimps_challenge_the_concept_of_'living_fossils'_ L2 - https://doi.org/10.7717/peerj.62 DB - PRIME DP - Unbound Medicine ER -