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A redescription of a rare chordate, Metaspriggina Walcotti Simonetta and Insom, from the Burgess Shale (Middle Cambrian), British Columbia, Canada

  • Simon Conway Morris (a1)

Until Recently, our understanding of the earliest history of the fish has been fragmentary in terms of the fossil record and conjectural with respect to many details of phylogeny. Fortunately, significant new information has become available in recent years, most notably from the discoveries of at least three taxa of agnathan fish from the Lower Cambrian Chengjiang Lagerstätte of Yunnan, China (Shu et al., 1999, 2003; Shu, 2003; see also Hou et al., 2002; Hou et al., 2004, p. 192-193; Zhang and Hou, 2004). Two of the taxa (Haikouichthys and Zhangjianichthys) are represented by numerous specimens, but it is noteworthy that amongst the forty-odd Burgess Shale-type occurrences apart from the Chengjiang Lagerstätte, chordates (or indeed cephalochordates and urochordates) are otherwise unknown. The one exception is the Burgess Shale itself, characterized by the rather enigmatic Pikaia gracilens (Conway Morris, 1982, 1998) and the much rarer chordate described herein. Apart from this exceptionally preserved material, the fossil record effectively only begins in the Ordovician (e.g., Sansom et al., 2001, 2005; Sansom and Smith, 2005), in as much putative fish scales from the latest Cambrian (Young et al., 1996) may be better interpreted as arthropodan (see Smith et al., 2001, p. 78). The difficulties of interpreting what is overall an extremely patchy record are further compounded by the fact that the relevance to this early history of the extant agnathan hagfish and lamprey has remained (and indeed to some extent remains) problematic, given the uncertainty as to which of the presumed archaic features have been overprinted by specializations for modes of life that might have had little counterpart in the ancestral forms.

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N. J. Butterfield 2002. Leanchoilia guts and the interpretation of the three-dimensional structures in Burgess Shale-type fossils. Paleobiology, 28:155171.

N. J. Butterfield 2003. Exceptional fossil preservation and the Cambrian explosion. Integrative and Comparative Biology, 43:166177.

J.-B. Caron and D. A. Jackson 2006. Taphonomy of the Greater Phyllopod Bed community, Burgess Shale. Palaios, 21:451465.

J.-B. Caron , A. Scheltema , C. Schander , and D. Rudkin 2006. A soft-bodied mollusc with radula from the Middle Cambrian Burgess Shale. Nature, 442:159163.

J.-Y. Chen , J. Dzik , G. D. Edgecombe , L. Ramsköld , and G.-Q. Zhou 1995. A possible Early Cambrian chordate. Nature, 377:720722.

S. Conway Morris 1979. The Burgess Shale (Middle Cambrian) fauna. Annual Review of Ecology and Systematics, 10:327349.

S. Conway Morris 1989. The persistence of Burgess Shale-type faunas: Implications for the evolution of deeper-water faunas. Transactions of the Royal Society of Edinburgh: Earth Sciences, 80:271283.

S. Conway Morris 2006. Darwin's dilemma: The realities of the Cambrian ‘explosion’. Philosophical Transactions of the Royal Society of London B, 361:10691083.

E. Insom , A. Pucci , and A. M. Simonetta 1995. Cambrian Protochordata, their origin and significance. Bolletino di Zoologia, 62:243252.

P. Janvier 1998. Les vertébrés avant le Silurien. GeoBios, 30:931950.

P. G. Orr , S. L. Kearns , and D. E. G. Briggs 2002. Backscattered electron imaging of fossils exceptionally-preserved as organic impressions. Palaios, 17:110117.

I. J. Sansom , P. C. J. Donoghue , and A. G. Albanesi 2005. Histology and affinity of the earliest armoured vertebrate. Biological Letters, 1:446449.

I. J. Sansom and M. P. Smith 2005. Late Ordovician vertebrates from the Bighorn Mountains of Wyoming, USA. Palaeontology, 48:3148.

A. Seilacher , D. Grazhdankin , and A. Legouta 2003. Ediacaran biota: The dawn of animal life in the shadow of giant protists. Paleontological Research (Japan), 7:4354.

D.-G. Shu 2003. A paleontological perspective of vertebrate origin. Chinese Science Bulletin, 48:725735.

D.-G. Shu , S. Conway Morris , and X.-L. Zhang 1996. A Pikaia-like chordate from the Lower Cambrian of China. Nature, 384:157158.

D.-G. Shu , S. Conway Morris , J. Han , Z.-F. Zhang , K. Yasui , P. Janvier , L. Chen , X.-L. Zhang , J.-N. Liu , Y. Li , and H.-Q Liu . 2003. Head and backbone of the Early Cambrian vertebrate Haikouichthys. Nature, 421: 526529.

D.-G. Shu , S. Conway Morris , J. Han , Z.-F. Zhang , and J.-N. Liu 2004. Ancestral echinoderms from the Chengjiang deposits of China. Nature, 430: 422428.

D.-G. Shu , L.-H. Luo , S. Conway Morris , X.-L. Zhang , S.-X. Hu , L. Chen , J. Han , M. Zhu , Y. Li , and L.-Z. Chen 1999. Lower Cambrian vertebrates from South China. Nature, 402:4246.

A. M. Simonetta and E. Insom 1993. New animals from the Burgess Shale (Middle Cambrian) and their possible significance for the understanding of the Bilateria. Bolletino di Zoologia, 60:97107.

B. M. Waggoner 1996. Phylogenetic hypotheses of the relationships of arthropods to Precambrian and Cambrian problematic taxa. Systematic Biology, 45:190222.

G. C. Young , V. N. Karatajute-Talimaa , and M. M. Smith 1996. A possible late Cambrian vertebrate from Australia. Nature, 383:810812.

X.-G. Zhang and X.-G. Hou 2004. Evidence for a single median fin-fold and tail in the Lower Cambrian vertebrate, Haikouichthys ercaicunensis. Journal of Evolutionary Biology, 17:11621166.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
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