Stingray diversification across the end-Cretaceous extinctions

Terry Bertozzi, Mike Lee, Steve Donnellan

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    The evolution of stingrays (Myliobatiformes) is assessed using a new phylogeny with near-complete genus-level sampling, and additional molecular data. Stingrays diversified into three primary clades: (A) river stingrays, round rays and typical stingrays, (B) butterfly rays and stingarees and (C) eagle and manta rays. The enigmatic sixgill and deepwater rays (Hexatrygon and Plesiobatis) are not basal stingrays, but are part of the second clade. There is extensive clade-specific variation in molecular evolutionary rates across chondrichthyans: the most appropriate (autocorrelated) divergence dating methods indicate that the extant stingray radiation commenced in the late Cretaceous and continued across the K-Pg boundary. This is highly consistent with the fossil record, and suggests that Cretaceous stingrays, being primarily benthic taxa, were less affected by the K-Pg event than taxa inhabiting the water column. The largest pelagic radiation of stingrays (myliobatids: eagle and manta rays) evolved very shortly after the K-Pg boundary, consistent with rapid ecological expansion into newly-vacated pelagic niches.

    Original languageEnglish
    Pages (from-to)379-390
    Number of pages12
    JournalMemoirs of Museum Victoria
    Volume74
    DOIs
    Publication statusPublished - 2016

    Fingerprint Dive into the research topics of 'Stingray diversification across the end-Cretaceous extinctions'. Together they form a unique fingerprint.

    Cite this