Hidden species diversity in an iconic living fossil vertebrate

Chase D. Brownstein, Daemin Kim, Oliver D. Orr, Gabriela M. Hogue, Bryn H. Tracy, M. Worth Pugh, Randal Singer, Chelsea Myles-Mcburney, Jon Michael Mollish, Jeffrey W. Simmons, Solomon R. David, Gregory Watkins-Colwell, Eva A. Hoffman, Thomas J. Near

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Ancient, species-poor lineages persistently occur across the Tree of life. These lineages are likely to contain unrecognized species diversity masked by the low rates of morphological evolution that characterize living fossils. Halecomorphi is a lineage of ray-finned fishes that diverged from its closest relatives before 200 Ma and is represented by only one living species in eastern North America, the bowfin, Amia calva Linnaeus. Here, we use double digest restriction-site-associated DNA sequencing and morphology to illuminate recent speciation in bowfins. Our results support the delimitation of a second living species of Amia, with the timing of diversification dating to the Plio-Pleistocene. This delimitation expands the species diversity of an ancient lineage that is integral to studies of vertebrate genomics and development, yet is facing growing conservation threats driven by the caviar fishery.

Original languageEnglish (US)
Article number20220395
JournalBiology letters
Volume18
Issue number11
DOIs
StatePublished - Nov 30 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 The Authors.

Keywords

  • biogeography
  • bowfin
  • ddRAD
  • phylogenetics
  • species delimitation

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