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Divergence time estimates for major cephalopod groups: evidence from multiple genes

Strugnell, Jan; Jackson, Jennifer; Drummong, Alexei J.; Cooper, Alan. 2006 Divergence time estimates for major cephalopod groups: evidence from multiple genes. Cladistics, 22 (1). 89-96. 10.1111/j.1096-0031.2006.00086.x

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Abstract/Summary

This is the first study to use both molecular and fossil data to date the divergence of taxa within the coleoid cephalopods (octopus, squid, cuttlefish). A dataset including sequences from three nuclear and three mitochondrial genes (3415 bp in total) was used to investigate the evolutionary divergences within the group. Divergence time analyses were performed using the Thorne/Kishino method of analysis which allows multiple constraints from the fossil record and permits rates of molecular evolution to vary on different branches of a phylogenetic tree. The data support a Paleozoic origin of the Orders Vampyromorpha, Octopoda and the majority of the extant higher level decapodiform taxa. These estimated divergence times are considerably older than paleontological estimates. The major lineages within the Order Octopoda were estimated to have diverged in the Mesozoic, with a radiation of many taxa around the Cretaceous/Cenozoic boundary. Higher level decapodiform phylogenetic relationships appear to have been obscured due to an ancient diversification of this group.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1096-0031.2006.00086.x
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Biodiversity, Functions, Limits and Adaptation from Molecules to Ecosystems
ISSN: 0748-3007
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
Additional Keywords: Cephalopods, Phylogeny
NORA Subject Terms: Biology and Microbiology
Zoology
Date made live: 04 Oct 2007 15:49
URI: http://nora.nerc.ac.uk/id/eprint/1040

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