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Paläontologische Zeitschrift

, Volume 76, Issue 1, pp 99–116 | Cite as

The Ordovician cornuteFlabellicystis rushtoni n. gen. n. sp. (Stylophora, Echinodermata) and its phylogenetic position within the group Cornuta

  • Monica Martí Mus
Article

Abstract

The new Tremadoc cornute,Flabellicystis rushtoni n. gen. n. sp., from the Shineton Shale Formation of Shropshire is described and reconstructed. The description is based on three articulated individuals preserved as moulds. The oldest cornutes are Middle Cambrian in age but only few species are known from sediments older than Arenig; the description of the new cornute is therefore a significant contribution to our knowledge of the early diversity and evolution of the group. BecauseFlabellicystis rushtoni is the second cornute described from Tremadoc sediments, it constitutes as well an important link between the Cambrian and the Arenig forms. A new cladistic analysis of the group Cornuta placesFlabellicystis between the Cambrian speciesPonticulocarpus robisoni and the Arenig genusChauvelicystis. The three genera share a similar basic design, almost identical marginal plating, a flat lower surface and an expanded, fan-like plate surrounding the anal lobe.

Keywords

Echinodermata Cornuta Stylophora Ordovician Tremadoc Shropshire phylogenetic position 

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Literature

  1. Arendt, D. &Nübler-Jung, K. 1994. Inversion of dorsoventral axis? - Nature371 (6492): 26.CrossRefGoogle Scholar
  2. Berg-Madsen, V. 1986. Middle Cambrian cystoid t(ensu lato system columnals from Bornholm, Denmark. - Lethaia19 (1): 67–80.CrossRefGoogle Scholar
  3. Bergström, J.;Naumann, W.W.;Viehweg, J. &Martí Mus, M. 1998. Conodonts, calcichordates and the origin of vertebrates. - Mitteilungen aus dem Museum für Naturkunde in Berlin, Geowissenschaftliche Reihe1 (1998): 81–92.Google Scholar
  4. Bromham, L.D. &Degnan, B.M. 1999. Hemichordates and deuterostome evolution: robust molecular phylogenetic support for a hemichordate + echinoderm clade. - Evolution & Development1 (3): 166–171.CrossRefGoogle Scholar
  5. Chauvel, J. 1966. Echinodermes de l’Ordovicien du Maroc. - Cahiers de Paléontologie1966: 1–112.Google Scholar
  6. Chauvel, J. 1986.Milonicystis kerfornei n. gen. n. sp. un nouvel echinoderme homalozoaire de l’Ordovicien armoricain. - Hercynica2(1): 79–81.Google Scholar
  7. Chauvel, J. 1971. Les Echinodermes Carpoïdes du Paléozoïque inférieur marocain. - Notes Service géologique du Maroc31 (237): 49–60.Google Scholar
  8. Chauvel, J. &Nion, J. 1997. Echinodermes (Homalozoa: Cornuta et Mitrata) noveaux pour l’Ordovicien du Massif Armoricain et conséquences paléogéographiques. - Géobios10 (1): 35–49.CrossRefGoogle Scholar
  9. Cripps, A.P. 1988. A new species of stem-group chordate from the Upper Ordovician of northern Ireland. - Palaeontology31 (4): 1053–1077.Google Scholar
  10. Cripps, A.P. 1989a. Anew stem-group chordate (Cornuta) from the Llandeilo of Czechoslovakia and the cornute-mitrate transition. - Zoological Journal of the Linnean Society96: 49–85.CrossRefGoogle Scholar
  11. Cripps, A.P. 1989b. A new genus of stem chordate (Cornuta) from the Lower and Middle Ordovician of Czechoslovakia and the origin of bilateral symmetry in the chordates. - Géobios22 (2): 215–245.CrossRefGoogle Scholar
  12. Cripps, A.P. 1991. A cladistic analysis of the cornutes (stemchordates). - Zoological Journal of the Linnean Society102: 333–666.CrossRefGoogle Scholar
  13. Cripps, A.P. &Daley, P.E.J. 1994. Two cornutes from the Middle Ordovician (Llandeilo) of Normandy, France, and the reinterpretationof Milonicystis kerfornei. - Palaeontographica, (A)232 (4–6): 99–132.Google Scholar
  14. Daley, P.E.J. 1992. Two new cornutes from the Lower Ordovician of Shropshire and southern France. - Palaeontology35(1): 127–148.Google Scholar
  15. David, B.;Lefebvre, B.;Mooi, R. &Parsley, R. 2000. Are homalozoans echinoderms? An answer from the extraxialaxial theory. - Paleobiology26 (4): 529–555.CrossRefGoogle Scholar
  16. Derstler, K. 1979. Biogeography of the stylophoran carpoids (Echinodermata). -In:Gray, J. &Boucot, A.J., eds., Historical Biogeography, Plate tectonics, and the Changing Environment: 91–109, Corvallis/Oregon (Oregon University Press).Google Scholar
  17. Fisher, D.C. 1982. Stylophoran skeletal crystallography: testing the calcichordate theory of vertebrate origins. -Geological Society of America, Abstracts with programs14 (7): 488.Google Scholar
  18. Fleming, J. 1828. A History of British Animals, exhibiting the descriptive Characters and systematical Arrangement of the Genera and Species of Quadrupeds, Birds, Reptiles, Fishes, Mollusca, and Radiata of the United Kingdom. - 565 p., Edinburgh (Bell & Bradfutes).Google Scholar
  19. Fortey, R.A. &Owens, R.M. 1991. A trilobite fauna from the highest Shineton Shales in Shropshire and the correlation of the latest Tremadoc. - Geological Magazine128 (5): 437–434.CrossRefGoogle Scholar
  20. Franzen, C. 1997. Middle Cambrian echinoderms from south central Sweden. - Geological Society of America, Abstracts with programs29 (6): 98.Google Scholar
  21. Gil Cid, M.D.;Domínguez Alonso, P.;Silván Pobes, E. &Escribano Ródenas, M. 1996.Bohemiaecystis jefferiesi n. sp.; primer Cornuta para el Ordovícico Español. -Estudios geológicos52: 313–326.Google Scholar
  22. Gill, E.D. &Caster, K.E. 1960. Carpoid echinoderms from the Silurian and Devonian of Australia. -Bulletins of American Paleontology41: 5–71.Google Scholar
  23. Guensburg, T.E. &Sprinkle, J. 2000. Ecologic radiation of Cambro-Ordovician echinoderms. - In:Zhuravlev, A. Yu. &Riding, R., eds., The Ecology of the Cambrian Radiation: 428–444, New York (Columbia University Press).Google Scholar
  24. Jaekel, O. 1901. Über Carpoideen, eine neue Klasse von Pelmatozoen. - Zeitschrift der Deutschen Geologischen Gesellschaft52: 661–677.Google Scholar
  25. Jefferies, R.P.S. 1968. The subphylum Calcichordata (Jefferies 1967) - primitive fossil chordates with echinoderm affinities.- Bulletin of the British Museum (Natural History), Geology16: 243–339.Google Scholar
  26. Jefferies, R.P.S. 1969.Ceratocystis perneri Jaekel - A middle Cambrian chordate with echinoderm affinities. -Palaeontology12 (3): 494–535.Google Scholar
  27. Jefferies, R.P.S. 1986. The ancestry of the vertebrates. - 376 pp., London (British Museum, Natural History).Google Scholar
  28. Jefferies, R.P.S. &Brown, N.A. 1995: Dorsoventral axis inversion? - Nature374 (6517): 22.CrossRefGoogle Scholar
  29. Jefferies, R.P.S.;Brown, N.A. &Daley, P.E.J. 1996: The early phylogeny of chordates and echinoderms and the origin of chordate left-right asymmetry and bilateral symmetry. - Acta Zoologica (Stockholm)77 (2): 101–122.CrossRefGoogle Scholar
  30. Jefferies, R.P.S. &Jacobson, A.G. 1998. An episode in the ancestry of vertebrates: from mitrate to crown-group craniate. - Integrative Biology: Issues, News, and Reviews1(4): 115–132.CrossRefGoogle Scholar
  31. Jefferies, R.P.S.;Lewis, M. &Donovan, S.K. 1987.Protocystites menevensis - A stem-group chordate (Cornuta) from the Middle Cambrian of South Wales. - Palaeontology30 (3): 429–484.Google Scholar
  32. Jefferies, R.P.S. &Prokop, R.J. 1972. A new calcichordate from the Ordovician of Bohemia and its anatomy, adaptations and relationships. - Biological Journal of the Linnean Society4 (2): 69–115.CrossRefGoogle Scholar
  33. Kolata, D.R.;Frest, T.J. &Mapes, R.H. 1991. The youngest carpoid: ocurrence, affinities, and life mode of a Pennsylvanian (Morrowan) mitrate from Oklahoma. - Journal of Paleontology65 (5): 844–855.Google Scholar
  34. Lefebvre, B. 2000. Homologies in Stylophora: a test of the “Calcichordate Theory”. - Géobios33 (3): 359–364.CrossRefGoogle Scholar
  35. Lefebvre, B.;Racheboeuf, P. &David, B. 1998. Homologies in stylophoran echinoderms. - In:Mooi, R. &Telford, M., eds., Echinoderms: San Francisco: 103–109, Rotterdam (Balkema).Google Scholar
  36. Lefebvre, B. &Vizcaino, D. 1999. New Ordovician cornutes (Echinodermata, Stylophora) from Montagne Noire and Brittany (France) and a revision of the order Cornuta Jaekel 1901. -Géobios32 (3): 421–458.CrossRefGoogle Scholar
  37. Nübler-Jung, K. &Arendt, D. 1999. Dorsoventral axis inversion: Enteropneust anatomy links invertebrates to chordates turned upside down. - Journal of Zoological Systematics and Evolutionary Research37 (2): 93–100.CrossRefGoogle Scholar
  38. Parsley, R.L. 1988. Feeding and respiratory strategies in Stylophora. - In:Paul, C.R.C. &Smith, A.B., eds., Echinoderm phylogeny and evolutionary biology: 347–361, Oxford (Clarendon Press).Google Scholar
  39. Parsley, R.L. 1997. The echinoderm classes Stylophora and Homoiostelea: non Calcichordata. - Paleontological Society Papers3: 225–248.Google Scholar
  40. Parsley, R.L. 1998. Taxonomic revision of the Stylophora. - In:Mooi, R. &Telford, M., eds., Echinoderms: San Francisco: 111–117, Rotterdam (Balkema).Google Scholar
  41. Ruta, M. 1999. Brief review of the Stylophoran debate. - Evolution & Development1 (2): 123–135.CrossRefGoogle Scholar
  42. Sumrall, C.D. &Sprinkle, J. 1999.Ponticulocarpus, a new cornute-grade stylophoran from the Middle Cambrian Spence Shale of Utah. - Journal of Paleontology,73 (5): 886–891.Google Scholar
  43. Sumrall, C.D.;Sprinkle, J. &Guensburg, T.E. 1997. Systematics and paleoecology of Late Cambrian echinoderms from the western United States. - Journal of Paleontology,71 (6): 1091–1109.Google Scholar
  44. Swofford, D.L. 1993. PAUP: Phylogenetic Analysis Using Parsimony, Version 3.1.1. - 255 pp., Chapaign/Illinois (Illinois Natural History Survey).Google Scholar
  45. Ubaghs, G. 1963.Cothurnocystis Bather,Phyllocystis Thoral and an undeterminated member of the order soluta (Echinodermata, Carpoidea) in the upper-most Cambrian of Nevada. - Journal of Paleontology37 (6): 1133–1142.Google Scholar
  46. Ubaghs, G. 1967. Le genreCeratocystis Jaekel (Echinodermata, Stylophora). Paleontological Contributions University of Kansas22: 1–16.Google Scholar
  47. Ubaghs, G. 1968. Stylophora. - In:Moore, R.C., ed., Treatise on Invertebrate Paleontology, Part S (1967): S297-S650, Lawrence/Kansas (Geological Society of America & University of Kansas Press).Google Scholar
  48. Ubaghs, G. 1969. Les échinodermes carpoides de l’Ordovicien inférieur de la Montagne Noire (France). -Cahiers de Paléontologie1969: 1–110.Google Scholar
  49. Ubaghs, G. 1975. Early Paleozoic echinoderms. -Annual Review of Earth and Planetary Sciences3: 79–98.CrossRefGoogle Scholar
  50. Ubaghs, G. 1981. Reflexions sur la nature et la fonction de l’appendice articulé des carpoides Stylophora (Echinodermata). -Annales de Paléontologie (Invertébrés)67: 33–48.Google Scholar
  51. Ubaghs, G. 1983. Echinodermata. Notes sur les échinodermes de l’ordovicien inférieur de la Montagne Noire (France). - In:Courtessole, R.;Marek, L.;Pillet, J.;Ubaghs, G. &Vizcaino, D., eds., Calymenina, Echinodermata et Hyolitha de l’Ordovicien de la Montagne Noire (France Méridionale): 33–55, Carcassonne (Société d’Etudes Scientifiques de l’Aude).Google Scholar
  52. Ubaghs, G. 1987. Échinodermes nouveaux du Cambrien Moyen de la Montagne Noire (France). - Annales de Paléontologie (Vertébrés-Invertébrés)73 (1): 1–27.Google Scholar
  53. Ubaghs, G., 1991. Deux Stylophora (Homalozoa, Echinodermata) nouveaux pour l’Ordovicien inférieur de la Montagne Noire (France Meridionale). - Paläontologische Zeitschrift65: 157–171.Google Scholar
  54. Ubaghs, G. 1994. Échinodermes nouveaux (Stylophora, Eocrinoidea) de l’Ordovicien inférieur de la Montagne Noire (France). - Annales de Paléontologie (VertébrésInvertébrés)80 (2): 107–141.Google Scholar
  55. Ubaghs, G. 1999. Échinodermes nouveaux du Cambrien supérieur de la Montagne Noire (France méridionale). - Géobios31 (6): 809–829.CrossRefGoogle Scholar
  56. Ubaghs, G. &Robison, R.A. 1988. Homalozoan echinoderms of the Wheeler Formation (Middle Cambrian) of western Utah. - The University of Kansas Paleontological Contributions (Papers)120: 1–17.Google Scholar
  57. Woods, I.S. &Jefferies, R.P.S. 1992. Anew stem-group chordate from the Lower Ordovician of south Wales, and the problem of locomotion in boot-shaped cornutes. - Palaeontology35: 1–25.Google Scholar

Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2002

Authors and Affiliations

  • Monica Martí Mus
    • 1
  1. 1.Department of Earth Sciences (Historical Geology and Palaeontology)Uppsala UniversityUppsalaSweden

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