Hooking some stem-group "worms:" fossil lophotrochozoans in the Burgess Shale

Butterfield, N. J. (2006) Hooking some stem-group "worms:" fossil lophotrochozoans in the Burgess Shale. BioEssays, 28 (12). pp. 1161-1166. DOI 10.1002/bies.20507

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Abstract

The fossil record plays a key role in reconstructing deep evolutionary relationships through its documentation of the early diverging stem groups leading to extant phyla. In the middle Cambrian Burgess Shale, two famously problematic worms, Odontogriphus and Wiwaxia, have recently been reinterpreted as stem-group molluscs based on their shared expression of a putative radula and putative ctenidia in Odontogriphus.[1] More detailed analysis of these fossil structures, however, reveals pronounced anatomical and histological discrepancies with molluscan analogues, such that they are more reliably interpreted as primitive features of the superphylum Lophotrochozoa. In the absence of any obviously derived characters, Odontogriphus could be placed in the stem group of the Lophotrochozoa or on the stem of any of its constituent phyla, whereas the dorsal covering of chaetae in Wiwaxia identifies it as a stem-group polychaete. Despite their close relationship, these two jawed, segmented worms could conceivably represent the early stages of two separate phyla. BioEssays 28: 1161-1166, 2006. © 2006 Wiley Periodicals, Inc.

Item Type: Article
Uncontrolled Keywords: 2006 AREP IA52 2006 P
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: BioEssays
Volume: 28
Page Range: pp. 1161-1166
Identification Number: 10.1002/bies.20507
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:01
Last Modified: 23 Jul 2013 10:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/173

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