A phylogenetic hypothesis for Crocodylus (Crocodylia) based on mitochondrial DNA: Evidence for a trans-Atlantic voyage from Africa to the New World

Robert Meredith, Evon R. Hekkala, George Amato, John Gatesy

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The phylogenetic relationships among extant species of Crocodylus (Crocodylia) have been inconsistently resolved by previous systematic studies. Here we used nearly complete mitochondrial (mt) genomes (∼16,200 base pairs) for all described Crocodylus species, eight of which are new to this study, to derive a generally well-supported phylogenetic hypothesis for the genus. Model-based analyses support monophyly of all Asian. +. Australian species and paraphyly of Crocodylus niloticus (Nile crocodile) with a monophyletic New World clade nested within this species. Wild-caught Nile crocodiles from eastern populations group robustly with the four New World species to the exclusion of Nile crocodiles from western populations, a result that is also favored by parsimony analyses and by various subpartitions of the overall mt dataset. The fossil record of Crocodylus extends back only to the Late Miocene, while the earliest fossils assigned to C. niloticus and to New World Crocodylus are Pliocene. Therefore, in combination with paleontological evidence, mt DNA trees imply a relatively recent migration of Crocodylus from Africa to the Americas, a voyage that would have covered hundreds of miles at sea.

Original languageEnglish
Pages (from-to)183-191
Number of pages9
JournalMolecular Phylogenetics and Evolution
Volume60
Issue number1
DOIs
StatePublished - 1 Jul 2011

Fingerprint

Crocodylus niloticus
Crocodylia
Crocodylus
Alligators and Crocodiles
Mitochondrial DNA
mitochondrial DNA
phylogenetics
phylogeny
Mitochondrial Genome
Population Groups
Oceans and Seas
Base Pairing
fossils
paraphyly
fossil record
monophyly
Pliocene
genome
Population
Miocene

Keywords

  • Crocodile
  • Crocodylus
  • Dispersal
  • Genome
  • Mitochondrial
  • Phylogeny

Cite this

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abstract = "The phylogenetic relationships among extant species of Crocodylus (Crocodylia) have been inconsistently resolved by previous systematic studies. Here we used nearly complete mitochondrial (mt) genomes (∼16,200 base pairs) for all described Crocodylus species, eight of which are new to this study, to derive a generally well-supported phylogenetic hypothesis for the genus. Model-based analyses support monophyly of all Asian. +. Australian species and paraphyly of Crocodylus niloticus (Nile crocodile) with a monophyletic New World clade nested within this species. Wild-caught Nile crocodiles from eastern populations group robustly with the four New World species to the exclusion of Nile crocodiles from western populations, a result that is also favored by parsimony analyses and by various subpartitions of the overall mt dataset. The fossil record of Crocodylus extends back only to the Late Miocene, while the earliest fossils assigned to C. niloticus and to New World Crocodylus are Pliocene. Therefore, in combination with paleontological evidence, mt DNA trees imply a relatively recent migration of Crocodylus from Africa to the Americas, a voyage that would have covered hundreds of miles at sea.",
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A phylogenetic hypothesis for Crocodylus (Crocodylia) based on mitochondrial DNA : Evidence for a trans-Atlantic voyage from Africa to the New World. / Meredith, Robert; Hekkala, Evon R.; Amato, George; Gatesy, John.

In: Molecular Phylogenetics and Evolution, Vol. 60, No. 1, 01.07.2011, p. 183-191.

Research output: Contribution to journalArticle

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