Data from: Molecular clocks indicate turnover and diversification of modern coleoid cephalopods during the Mesozoic Marine Revolution
Coleoid cephalopod molluscs comprise squid, 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. Despit...
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Zusammenfassung: | Coleoid cephalopod molluscs comprise squid, 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, approx. 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 squid and dumbo octopuses have
ancient origins extending to the Early Mesozoic Era, 242 ± 38 Ma,
incirrate octopuses and the decabrachian coleoids (10-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. |
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DOI: | 10.5061/dryad.180nh |