Skip to content

Molecular clocks indicate turnover and diversification of modern coleoid cephalopods during the Mesozoic Marine Revolution

Research output: Contribution to journalArticle

Original languageEnglish
Article number20162818
Number of pages7
JournalProceedings of the Royal Society B: Biological Sciences
Volume284
Issue number1850
Early online date1 Mar 2017
DOIs
DateAccepted/In press - 8 Feb 2017
DateE-pub ahead of print - 1 Mar 2017
DatePublished (current) - Mar 2017

Abstract

Coleoid cephalopod molluscs comprise squids, cuttlefish and octopuses, and represent nearly the entire diversity of modern cephalopods. Sophisticated adaptations such as the use of colour for camouflage and communication, jet propulsion, and the ink sac highlight the unique nature of the group. Despite these striking adaptations, there are clear parallels in ecology between coleoids and bony fishes. The coleoid fossil record is limited, however, hindering confident analysis of the tempo and pattern of their evolution. Here we use a molecular dataset (180 genes, ~36,000 amino acids) of 26 cephalopod species to explore the phylogeny and timing of cephalopod evolution. We show that crown cephalopods diverged in the Silurian-Devonian, while crown coleoids had origins in the latest Palaeozoic. While the deep-sea vampire squids and dumbo octopuses have ancient origins extending to the Early Mesozoic Era, 242 ± 38 million years ago (Ma), incirrate octopuses and the decabrachian coleoids (ten-armed squid) diversified in the Jurassic Period. These divergence estimates highlight the modern diversity of coleoid cephalopods emerging in the Mesozoic Marine Revolution, a period that also witnessed the radiation of most ray-finned fish groups in addition to several other marine vertebrates. This suggests that that the origin of modern cephalopod biodiversity was contingent on ecological competition with marine vertebrates.

    Research areas

  • cephalopoda, molecular phylogenetics, phylogenomics, molecular clocks

Download statistics

No data available

Documents

Documents

  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online viathe Royal Society at http://rspb.royalsocietypublishing.org/content/284/1850/20162818. Please refer to any applicable terms of use of the publisher.

    Final published version, 1013 KB, PDF document

    Licence: CC BY

DOI

View research connections

Related faculties, schools or groups