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Orientation and anatomical notation in conodonts

  • Mark A. Purnell (a1), Philip C. J. Donoghue (a1) and Richard J. Aldridge (a2)

Abstract

All aspects of conodont paleontology rely on the identification and description of homologous anatomical units or elements. But the current schemes of anatomical notation and terms for orientation were formulated at a time when little was known of conodont anatomy or skeletal architecture, resulting in some confusion and difficulties in their application. With improving knowledge of conodonts, these problems are becoming increasingly acute.

In an attempt to address current problems, we introduce new terms for orientation in conodonts and their elements, and a modified scheme of anatomical notation. The principal axes of the conodont body are identified as rostrocaudal, dorsoventral, and mediolateral, with opposite lateral sides designated dextral and sinistral. Anatomical notation is defined according to topological relationships between elements with reference to the principal axes of the body and takes the form of letters with numeric subscripts (e.g., P1, P2, S0-S4). The ozarkodinid apparatus serves as a standard, but the Pn-Sn scheme can be applied rigorously to all taxa that are known from natural assemblages or where an hypothesis of topological homology can be inferred from secondary morphological criteria.

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Aldridge, R. J., and Theron, J. N. 1993. Conodonts with preserved soft tissue from a new Upper Ordovician Konservat-Lagerstätte. Journal of Micropalaeontology, 12:113117.
Aldridge, R. J., Purnell, M. A., Gabbott, S. E., and Theron, J. N. 1995. The apparatus architecture and function of Promissum pulchrum Kovács-Endrödy (Conodonta, Upper Ordovician), and the prioniodontid plan. Philosophical Transactions of the Royal Society, London, Series B, 347:275291.
Aldridge, R. J., Smith, M. P., Norby, R. D., and Briggs, D. E. G. 1987. The architecture and function of Carboniferous polygnathacean conodont apparatuses, p. 6376. In Aldridge, R. J. (ed.), Palaeobiology of Conodonts. Ellis Horwood, Chichester.
Aldridge, R. J., Briggs, D. E. G., Clarkson, E. N. K., and Smith, M. P. 1986. The affinities of conodonts—new evidence from the Carboniferous of Edinburgh, Scotland. Lethaia, 19:279291.
Aldridge, R. J., Briggs, D. E. G., Clarkson, E. N. K., Smith, M. P., Clarkson, E. N. K., and Clark, N. D. L. 1993. The anatomy of conodonts. Philosophical Transactions of the Royal Society, London, Series B, 340:405421.
Barnes, C. R., Kennedy, D. J., McCracken, A. D., Nowlan, G. S., and Tarrant, G. A. 1979. The structure and evolution of Ordovician conodont apparatuses. Lethaia, 12:125151.
Barrick, J. E. 1977. Multielement simple-cone conodonts from the Clarita Formation (Silurian), Arbuckle Mountains, Oklahoma. Geologica et Palaeontologica, 11:4768.
Bergström, S. M., and Sweet, W. C. 1966. Conodonts from the Lexington Limestone (Middle Ordovician) of Kentucky and its lateral equivalents in Ohio and Indiana. Bulletins of American Paleontology, 50:271441.
Briggs, D. E. G., Clarkson, E. N. K., and Aldridge, R. J. 1983. The conodont animal. Lethaia, 16:114.
Brown, R. W. 1956. Composition of scientific words: a manual of methods and a lexicon of materials for the practice of logotechnics. Smithsonian Institution Press, Washington, D.C, 882 p.
Donoghue, P. C. J., and Purnell, M. A. 1999a. Growth, function, and the conodont fossil record. Geology, 27:251254.
Donoghue, P. C. J., and Purnell, M. A. 1999b. Mammal-like occlusion in conodonts. Paleobiology, 25:5874.
Dzik, J. 1991. Evolution of the oral apparatuses in the conodont chordates. Acta Palaeontologica Polonica, 36:265323.
Dzik, J. 1994. Conodonts of the Mójcza Limestone. Palaeontologica Polonica, 53:43128.
Gabbott, S. E., Aldridge, R. J., and Theron, J. N. 1995. A giant conodont with preserved muscle tissue from the Upper Ordovician of South Africa. Nature, 374:800803.
Hall, B. K. (ed.). 1994. Homology: The Hierarchical Basis of Comparative Biology. Academic Press, San Diego, 483 p.
Igo, H., Norihiro, N., and Veerasak, N. 1988. Middle Triassic conodonts from southern Thailand. Annual Report of the Institute of Geoscience, the University of Tsukuba, 14:4650.
Jeppsson, L. 1971. Element arrangement in conodont apparatuses of Hindeodella type and in similar forms. Lethaia, 4:101123.
Jeppsson, L. 1997. A new latest Telychian, Sheinwoodian and early Homerian (Early Silurian) standard conodont zonation. Transactions of the Royal Society of Edinburgh (Earth Sciences), 88:91114.
Qiang, Ji, and Ziegler, W. 1992. Introduction to some Late Devonian sequences in the Guilin area of Guangxi, south China. Courier Forschungsinstitut Senckenberg, 154:149177.
Klapper, G. and Philip, G. M. 1971. Devonian conodont apparatuses and their vicarious skeletal elements. Lethaia, 4:429452.
Lange, F.-G. 1968. Conodonten-gruppenfunde aus Kalken des tieferen Oberdevon. Geologica et Palaeontologica, 2:3757.
Leslie, S. A. 1997. Apparatus architecture of Belodina (Conodonta): Interpretations based on fused clusters of Belodina compressa (Branson and Mehl, 1933) from the Middle Ordovician (Turinian) Plattin Limestone of Missouri and Iowa. Journal of Paleontology, 71:921926.
Löfgren, A. M. 1997. Reinterpretation of the lower Ordovician conodont apparatus Paroistodus. Palaeontology, 40:913929.
Mietto, P. 1982. A Ladinian conodont-cluster of Metapolygnathus mungoensis (Diebel) from Trento area (NE Italy). Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 1982:600606.
Müller, K. J. 1956. Taxonomy, nomenclature, orientation, and stratigraphic evaluation of conodonts. Journal of Paleontology, 30:13241340.
Nicoll, R. S. 1977. Conodont apparatuses in an Upper Devonian palaeoniscoid fish from the Canning Basin, Western Australia. Bureau of Mineral Resources Journal of Australian Geology and Geophysics, 2:217228.
Nicoll, R. S. 1985. Multielement composition of the conodont species Polygnathus xylus xylus Stauffer, 1940 and Ozarkodina brevis (Bischoff and Ziegler, 1957) from the Upper Devonian of the Canning Basin, Western Australia. Bureau of Mineral Resources Journal of Australian Geology and Geophysics, 9:133147.
Nicoll, R. S. 1987. Form and function of the Pa element in the conodont animal, p. 7790. In Aldridge, R. J. (ed.), Palaeobiology of Conodonts. Ellis Horwood, Chichester.
Nicoll, R. S. 1994. Seximembrate apparatus structure of the Late Cambrian coniform conodont Teridontus nakamurai from the Chatsworth Limestone, Georgina Basin, Queensland. AGSO Journal of Australian Geology and Geophysics, 15:367379.
Nicoll, R. S. 1995. Conodont element morphology, apparatus reconstructions and element function: a new interpretation of conodont biology with taxonomic implications. Courier Forschungsinstitut Senckenberg, 182:247262.
Nowlan, G. S. 1993. A huddle on conodonts. Lethaia, 26:214.
Orchard, M. J. 1998. Triassic multielement gondolellids, p. 8283. In Bagnoli, G. (ed.), Seventh international conodont symposium held in Europe (ECOS VII), Abstracts. Tipografia Compositori, Bologna.
Orchard, M. J., and Rieber, H. 1996. Multielement clothing for Neogondolella (Conodonta, Triassic). Sixth North American Paleontological Convention Program and Abstracts. Paleontological Society Special Publication, 8:297.
Over, D. J. 1992. Conodonts and the Devonian-Carboniferous boundary in the upper Woodford Shale, Arbuckle Mountains, south central Oklahoma. Journal of Paleontology, 66:293311.
Purnell, M. A. 1992. Conodonts of the Lower Border Group and equivalent strata (Lower Carboniferous) in northern Cumbria and the Scottish Borders. Royal Ontario Museum, Life Sciences Contributions, 156:179.
Purnell, M. A. 1993. The Kladognathus apparatus (Conodonta, Carboniferous): homologies with ozarkodinids and the prioniodinid Bauplan. Journal of Paleontology, 67:875882.
Purnell, M. A., and Donoghue, P. C. J. 1997. Skeletal architecture and functional morphology of ozarkodinid conodonts. Philosophical Transactions of the Royal Society, London, Series B, 352:15451564.
Purnell, M. A., and Donoghue, P. C. J. 1998. Skeletal architecture, homologies and taphonomy of ozarkodinid conodonts. Palaeontology, 41:57102.
Purnell, M. A., and von Bitter, P. H. 1996. Bedding-plane assemblages of Idioprioniodus, element locations, and the Bauplan of prioniodinid conodonts, p. 48. In Dzik, J. (ed.), Sixth European conodont symposium, Abstracts. Instytut Paleobiologii PAN, Warszawa.
Ramovš, A. 1977. Skelettapparat von Pseudofurnishius murcianus (Conodontophorida) in der Mitteltrias Sloweniens (NW Jugoslawien). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 153:361399.
Ramovš, A. 1978. Mitteltriassische Conodonten-clusters in Slovenien, NW Jugoslawien. Paläontologische Zeitschrift, 52:129137.
Repetski, J. E., Purnell, M. A., and Barrett, S. F. 1998. The apparatus architecture of Phragmodus, p. 9192. In Bagnoli, G. (ed.), Seventh international conodont symposium held in Europe (ECOS VII), Abstracts. Tipografia Compositori, Bologna.
Rieber, H. 1980. Ein Conodonten-Cluster aus der Grenzbitumenzone (Mittlere Trias) des Monte San Giorgio (Kt. Tessin/Schweiz). Ann. Naturhist. Mus. Wien, 83:265274.
Rieppel, O. 1994. Homology, topology, and typology: the history of modern debates, p. 63100. In Hall, B. K. (ed.), Homology: The Hierarchical Basis of Comparative Biology. Academic Press, San Diego.
Roth, V. L. 1991. Homology and hierarchies: problems solved and unresolved. Journal of Evolutionary Biology, 4:167194.
Rowe, T. 1986. Homology and evolution of the deep thigh musculature in birds and other reptilia. Journal of Morphology, 189:327346.
Sansom, I. J., Armstrong, H. A., and Smith, M. P. 1994. The apparatus architecture of Panderodus and its implications for coniform conodont classification. Palaeontology, 37:781799.
Schmidt, H., and Müller, K. J. 1964. Weitere Funde von Conodonten-Gruppen aus dem oberen Karbon des Sauerlandes. Paläontologische Zeitschrift, 38:105135.
Smith, M. P. 1991. Early Ordovician conodonts of East North Greenland. Meddelelser om Gr⊘nland, Geoscience, 26:181.
Smith, M. P., Briggs, D. E. G., and Aldridge, R. J. 1987. A conodont animal from the lower Silurian of Wisconsin, U.S.A., and the apparatus architecture of panderodontid conodonts, p. 91104. In Aldridge, R. J. (ed.), Palaeobiology of Conodonts. Ellis Horwood, Chichester.
Stewart, I. R. 1995. Conodont bedding plane assemblages from the Ordovician of central Victoria, Australia., p. 103. In Brock, G. (ed.), First Australian Conodont Symposium and the Boucot Symposium, Abstracts and Program. Macquarie University Centre Ecostratigraphy and Palaeobiology Special Publication 1.
Sweet, W. C. 1981a. Macromorphology of elements and apparatuses, p. W5W20. In Robison, R. A. (ed.), Treatise on Invertebrate Paleontology, Pt. W, Miscellanea, Supplement 2, Conodonta. Geological Society of America and University of Kansas Press, Lawrence.
Sweet, W. C. 1981b. Glossary of morphological and structural terms for conodont elements and apparatuses, p. W60W67. In Robison, R. A. (ed.), Treatise on Invertebrate Paleontology, Pt. W, Miscellanea, Supplement 2, Conodonta. Geological Society of America and University of Kansas Press, Lawrence.
Sweet, W. C. 1988. The Conodonta: morphology, taxonomy, paleoecology, and evolutionary history of a long-extinct animal phylum. Oxford monographs on geology and geophysics No. 10. Clarendon Press, Oxford, 212 p.
Sweet, W. C., and Schönlaub, H. P. 1975. Conodonts of the genus Oulodus Branson & Mehl, 1933. Geologica et Palaeontologica, 9:4159.
Tautz, D. 1998. Evolutionary biology—Debatable homologies. Nature, 395:17.
von Bitter, P. H., and Merrill, G. K. 1998. Apparatus composition and structure of the Pennsylvanian conodont genus Gondolella based on assemblages from the Desmoinesian of northeastern Illinois, USA. Journal of Paleontology, 72:112132.
Webers, G. F. 1966. The Middle and Upper Ordovician conodont fauna of Minnesota. Minnesota Geological Survey Special Publication, 4:1123.

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Orientation and anatomical notation in conodonts

  • Mark A. Purnell (a1), Philip C. J. Donoghue (a1) and Richard J. Aldridge (a2)

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