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The morphology and phylogenetic significance ofKerygmachela kierkegaardi Budd (Buen Formation, Lower Cambrian, N Greenland)
Published online by Cambridge University Press: 03 November 2011
- Graham E. Budd
- Affiliation:Department of Earth Sciences, Historical Geology and Palaeontology, University of Uppsala, Norbyvägen 22, Uppsala S-752 36, Sweden [graham.budd@pal.uu.se]
Abstract
Specimens ofKerygmachela kierkegaardi Budd are described, from the Lower Cambrian Sirius Passet fauna of N Greenland. The cephalic region is characterised by a pair of stout unsegmented appendages each bearing long spinose processes, and an anterior mouth. The trunk shows alternating rows of tubercles and transverse annulations along the axis, to which are attached 11 pairs of gill-bearing lateral lobes and lobopodous limbs. The caudal region is small, and bears two long tail spines. There is some evidence for circular musculature arranged around the trunk and a dorsal, longitudinal sinus, and several details of the muscular pharynx have been preserved.
The combination of characters found inKerygmachela allows it to be allied with the lobopods, represented in the extant fauna by the onychophorans, tardigrades, and possibly the pentastomids, and in the Cambrian fossil record by a morphologically diverse set of taxa, some of which are not assignable to the extant groupings. It also shares important characters with the previously problematic Burgess Shale formsOpabinia regalis Walcott andAnomalocarisWhiteaves, and the Sirius Passet form Pambdelurion Budd. These taxa together form a paraphyletic group at the base of the clade of biramous arthropods. The position of the so-called ‘Uniramia’ remains unclear. It can be demonstrated from the reconstruction of the arthropod stem-group that full arthropod segmentation has a different derivation from that of the annelids. In line with other recent analyses, this suggests that the ‘Articulata’ of Cuvier should be dismantled, and the arthropods considered to be a group of protostomes which are phylogenetically distinct from the classic spiralians. Arthropod affinities may rather lie with the other moulting animals, in the so-called ‘Ecdysozoa’.
- Type
- Research Article
- Information
- Earth and Environmental Science Transactions of The Royal Society of Edinburgh ,Volume 89 ,Issue 4, 1998, pp. 249 - 290
- Copyright
- Copyright © Royal Society of Edinburgh 1998
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