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Manitouscolex, a new palaeoscolecidan genus from the Lower Ordovician of Colorado

Published online by Cambridge University Press:  14 July 2015

Oliver Lehnert  and
Petr Kraft
Oliver Lehnert
Affiliation:
Paleontologie–Sciences de la Terre, UMR 8014 CNRS, USTL, Cite Scientifique SN5, F-59655 Villeneuve d'Ascq Cedex, France,
Petr Kraft
Affiliation:
Charles University Prague, Institute of Geology and Palaeontology, Albertov 6, 128 43, Prague 2, Czech Republic,
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Extract

Palaeoscolecidans represent an extinct class of vermiform organisms with a prominent annulation ranging from the Lower Cambrian to the Upper Silurian. Since the first descriptions in the 1950s, they have been attributed to different groups, but recently they have been linked to the priapulids (Conway Morris, 1997). Palaeoscolecids are mainly considered to represent members of Ecdysozoa. Their position within this clade is still under discussion, but cladistic analyses indicate that they are either close relatives of nematomorphs (Hou and Bergström, 1994) or part of an extinct sister clade to the priapulids (Wills, 1998; Dong et al., 2004). The outer cuticle of palaeoscolecidan segments possesses microelements mineralized by calcium phosphate, which are often found isolated in the conodont collections obtained from carbonates after acid treatment. Kraft and Mergl (1989), van den Boogaard (1989b), Hinz et al. (1990), and Müller and Hinz-Schallreuter (1993) clearly showed the evidence that these isolated sclerites originate from certain palaeoscolecidan taxa. The specimens documented in this paper represent such fragmented material from the Manitou Formation of west-central Colorado. Extensive taxonomic and morphologic reviews of the palaeoscolecidans were provided by Müller and Hinz-Schallreuter (1993), Conway Morris (1997), Wrona and Hamdi (2001), and Ivantsov and Wrona (2004).

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 80 , Issue 2 , March 2006 , pp. 386 - 391
Copyright
Copyright © The Paleontological Society 

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