Cambrian stalked echinoderms show unexpected plasticity of arm construction

Proceedings of the Royal Society B: Biological Sciences

Volumn 279, Issue 1727, 2012, Pages 293-298

  Zamora, S ^a   Smith, A B ^a  

^a DEPARTMENT OF LIFE SCIENCES   (United Kingdom)

Author keywords

Cambrian; Echinoderms; Evolution; Phylogeny; X ray tomography

Indexed keywords

CAMBRIAN; ECHINODERM; EVOLUTIONARY BIOLOGY; MORPHOLOGY; PHYLOGENETICS; PHYLOGENY; X-RAY SPECTROSCOPY;

EID: 82955240681     PISSN: 09628452     EISSN: 14712970     Source Type: Journal    
DOI: 10.1098/rspb.2011.0777     Document Type: Article

References (24)

1. Davidson, E. H. & Erwin, D. H. 2006 Gene regulatory networks and the evolution of animal body plans. Science 311, 796-800. (doi:10.1126/science.1113832)
2. Peterson, K. J., Dietrich, M. R. & McPeek, M. A. 2009 MicroRNAs and metazoan macroevolution: insights into canalization, complexity, and the Cambrian explosion. Bioessays 31, 736-747. (doi:10.1002/bies.200900033)
3. Budd, G. E. & Jensen, S. 2000 A critical reappraisal of the fossil record of the bilaterian phyla. Biol. Rev. 75, 253-295. (doi:10.1017/S000632310000548X)
4. Hughes, N. C. 2007 Strength in numbers: high phenotypic variance in early Cambrian trilobites and its evolutionary implications. Bioessays 29, 1081-1084. (doi:10.1002/bies.20674)
5. Briggs, D. E.G. & Fortey, R. A. 2005 Wonderful strife: systematics, stem groups, and the phylogenetic signal of the Cambrian radiation. Paleobiology 31, 94-112. (doi:10. 1666/0094-8373(2005)031[0094:WSSSGA]2.0.CO;2)
6. Conway Morris, S. 2006 Darwin's dilemma: the realities of the Cambrian 'explosion'. Phil. Trans. R. Soc. B 361, 1069-1083. (doi:10.1098/rstb.2006.1846)
7. Smith, A. B. 2008 Deuterostomes in a twist: the origins of a radical new body plan. Evol. Dev. 10, 493-503. (doi:10.1111/j.1525-142X.2008.00260.x)
8. Swalla, B. J. & Smith, A.B. 2008 Deciphering deuterostome phylogeny: molecular, morphological and palaeontological perspectives. Proc. R. Soc. B 363, 1557-1568. (doi:10. 1098/rstb.2007.2246)
9. Guensburg, T. E. & Sprinkle, J. 2007 Phylogenetic implications of the Protocrinoidea: blastozoans are not ancestral to crinoids. Ann. Paléontol. 93, 277-290. (doi:10.1016/j.annpal.2007.09.005)
10. Guensburg, T. E. & Sprinkle, J. 2009 Solving themystery of crinoid ancestry: newfossil evidence of armorigin and development. J. Paleontol. 83, 350-364. (doi:10.1666/08-090.1)
11. Ubaghs, G. 1969 Aethocrinus moorei Ubaghs, n. gen., n. sp., le plus ancien crinoide dicyclique connu. Univ. Kansas Paleontol. Contrib. Paper 38, 1-25.
12. Ausich,W. I. 1999 Origin of crinoids. In Echinodermresearch 1998 (eds M. D. Candia Carnevali & F. Bonasoro), pp. 237-242. Rotterdam, The Netherlands: A. A. Balkema.
13. Guensburg, T. E., Mooi, R., Sprinkle, J., David, B. & Lefebvre, B. 2010 Pelmatozoan arms from the mid-Cambrian of Australia: bridging the gap between brachioles and brachials? Comment: there is no bridge. Lethaia 43, 432-440. (doi:10.1111/j.1502-3931.2010.00220.x)
14. Clausen, S., Jell, P., Legrain, X. & Smith, A. B. 2009 Pelmatozoan arms in the Middle Cambrian: bridging the gap between brachioles and brachials? Lethaia 42, 283-296. (doi:10.1111/j.1502-3931.2008.00145.x)
15. Zamora, S. & Smith, A. B. 2010 The oldest isorophid edrioasteroid (Echinodermata) and the evolution of attachment strategies inCambrian edrioasteroids. Acta Palaeontol. Pol. 55, 487-494. (doi:10.4202/app.2010.0012)
16. Ubaghs, G. 1987 Echinodermes nouveaux du Cambrien moyen de la Montagne Noire (France). Ann. Paléontol. 73, 1-27.
17. Sutton, M. 2010 Spiers software and instruction manual. See http://spiers-software.org/.
18. Swofford, D. L. 2002 PAUP*: phylogenetic analysis using parsimony (*and other methods), v. 4. Sunderland, MA: Sinauer Associates.
19. David, B., Lefebvre, B., Mooi, R. & Parsley, R. 2000 Are homalozoans echinoderms? An answer from the extraxial- axial theory. Paleobiology 26, 529-555. (doi:10.1666/0094-8373(2000)026,0529:AHEAAF.2.0.CO;2)
20. Smith, A. B. 1988 Patterns of diversification and extinction in early Palaeozoic echinoderms. Palaeontology 31, 799-828.
21. Sumrall, C. D. & Wray, G. A. 2007 Ontogeny in the fossil record: diversification of body plans and the evolution of 'aberrant' symmetry in Paleozoic echinoderms. Paleobiology 33, 149-163. (doi:10.1666/06053.1)
22. Sprinkle, J., Parsley, R. L., Zhao, Y. & Peng, J. 2011 Revision of lyracystid eocrinoids from the Middle Cambrian of South China and Western Laurentia. J. Paleontol. 85, 250-255. (doi:10.1666/10-072.1)
23. Sprinkle, J. & Collins, D. 2006 New eocrinoids from the Burgess Shale, southern British Columbia, Canada, and the Spence Shale, northern Utah, USA. Can. J. Earth Sci. 43, 303-322. (doi:10.1139/e05-107)
24. Sumrall, C. D. & Sprinkle, J. 1995 Plating and pectinirhombs of the Ordovician rhombiferan Plethoschisma. J. Paleontol. 69, 772-778.