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Rare primitive deuterostomes from the Cambrian (Series 3) of Utah

  • Simon Conway Morris (a1), Susan L. Halgedahl (a2), Paul Selden (a3) and Richard D. Jarrard (a2)
Abstract
Abstract

The fossil record of early deuterostome history largely depends on soft-bodied material that is generally rare and often of controversial status. Banffiids and vetulicystids exemplify these problems. From the Cambrian (Series 3) of Utah, we describe specimens of Banffia episoma n. sp. (from the Spence Shale) and Thylacocercus ignota n. gen. n. sp. (from the Wheeler Formation). The new species of Banffia Walcott, 1911 shows significant differences to the type species (B. constricta Walcott, 1911) from the Cambrian (Series 3, Stage 5) Burgess Shale, notably in possessing a prominent posterior unit but diminished anterior section. Not only does this point to a greater diversity of form among the banffiids, but also B. episoma indicates that the diagnostic median constriction and crossover of either side of the body are unlikely to be the result of taphonomic twisting but are original features. Comparisons extend also to the Cambrian (Series 2) Heteromorphus Luo and Hu in Luo et al., 1999 and, collectively, these observations support an assignment of the banffiids to the vetulicolians. The new taxon T. ignota represents the first discovery of a vetulicystid from beyond China and also significantly extends its stratigraphic range from Series 2 Cambrian into Series 3 Cambrian. Despite overall similarities in bodyplan, T. ignota differs from other vetulicystids in a number of respects, notably the possession of an anterior zone with broad tentacle-like structures. This new discovery is consistent with the vetulicystids representing stem-group ambulacrarians.

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R.J. Aldridge , X-G. Hou , D.J. Siveter , and S.E. Gabbott , 2007, The systematics and phylogenetic relationships of vetulicolians: Palaeontology, v. 50, p. 131168.

D.E.G. Briggs , B.S. Lieberman , S.L. Halgedahl , and R.D. Jarrard , 2005, A new metazoan from the Middle Cambrian of Utah and the nature of the Vetulicolia: Palaeontology, v. 48, p. 681686.

J.-B. Caron , 2006, (for 2005), Banffia constricta, a putative vetulicolid from the Middle Cambrian Burgess Shale: Transactions of the Royal Society of Edinburgh: Earth Sciences, v. 96, p. 95111.

J.-B. Caron , S. Conway Morris , and C.B. Cameron , 2013, Tubicolous enteropneusts from the Cambrian period: Nature, v. 495, p. 503506.

S. Conway Morris , and J.B. Caron , 2014, A primitive fish from the Cambrian of North America: Nature, v. 512, p. 419422.

D.C. García-Bellido , M.Y.S. Lee , G.D. Edgecombe , J.B. Jago , J.G. Gehling , and J.R. Paterson , 2014, A new vetulicolian from Australia and its bearing on the chordate affinities of an enigmatic Cambrian group: BMC Evolutionary Biology, v. 14, p. e214.

S.H. Halgedahl , R.D. Jarrard , C.E. Brett , and P.E. Allison , 2009, Geophysical and geological signatures of relative sea level change in the upper Wheeler Formation, Drum Mountains, West-Central Utah: a perspective into exceptional preservation of fossils: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 277, p. 3456.

M.G. Mángano , R.G. Bromley , D.A.T. Harper , A.T. Nielsen , M.P. Smith , and J. Vinther , 2012, Nonbiomineralized carapaces in Cambrian seafloor landscapes (Sirius Passet, Greenland): opening a new window into early Phanerozoic benthic ecology: Geology, v. 40, p. 519522.

Q. Ou , S. Conway Morris , J. Han , Z.-F. Zhang , J.-N. Liu , A.-L. Chen , X.-L. Zhang , and D. Shu , 2012, Evidence for gill slits and a pharynx in Cambrian vetulicolians: implications for the early evolution of deuterostomes: BMC Biology, v. 10, p. e81.

D.-G. Shu , 2005, On the phylum Vetulicolia: Chinese Science Bulletin, v. 50, p. 23422354.

D.-G. Shu , S. Conway Morris , J. Han , X.-L. Zhang , Z.-F. Zhang , H.-Q. Liu , Y. Li , and J.-N. Liu , 2001, Primitive deuterostomes from the Chengjiang Lagerstätte (Lower Cambrian, China): Nature, v. 414, p. 419424.

D.-G. Shu , S. Conway Morris , J. Han , Z.-F. Zhang , and J.-N. Liu , 2002, Ancestral echinoderms from the Chengjiang deposits of China: Nature, v. 430, p. 422428.

D.-G. Shu , S. Conway Morris , Z.-F. Zhang , and J. Han , 2010, The earliest history of the deuterostomes: the importance of the Chengjiang Fossil–Lagerstätte: Proceedings of the Royal Society of London, B, v. 277, p. 165174.

A.B. Smith , and S. Zamora , 2013, Cambrian spiral-plated echinoderms from Gondwana reveal the earliest pentaradial bodyplan: Proceedings of the Royal Society of London, B, v. 280, p. 20131197.

J. Vinther , M.P. Smith , and D.A.T. Harper , 2011, Vetulicolians from the Lower Cambrian Sirius Passet Lagerstätte, North Greenland, and the polarity of morphological characteristics in basal deuterostomes: Palaeontology, v. 54, p. 711719.

Y. Wang , J.-P. Lin , Y.-L. Zhao , and P.J. Orr , 2009, Palaeoecology of the trace fossil Gordia and its interaction with nonmineralizing taxa from the early Middle Cambrian Kaili biota, Guizhou Province, South China: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 277, p. 141148.

S. Zamora , I.A. Rahman , and A.B. Smith , 2012, Plated Cambrian bilaterians reveal the earliest stages of echinoderm evolution: PLoS ONE, v. 7, p. e38296.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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