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Evolution and Diversity of Chondrichthyans (2008 ; Warszawa)
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Abstrakty
Carcharopsis is a Palaeozoic shark comprising an enameloid-covered cutting dentition comprising serrated teeth. The enameloid ultrastructure of the teeth of C. prototypus is examined for the first time and consists of a 35 [my]m thick layer of tightly compacted apatite crystallites with a maximum individual length of 0.1 [my]m. The crystallites are randomly-oriented toward the base of the enameloid layer, but assume a roughly parallel orientation higher up in the enameloid, with their long axes arranged normal to the tooth surface. The enameloid of typical hybodonts comprises a compact outer crystallite layer and a looser, bundled inner layer. The Cretaceous hybodonts, Priohybodus arambourgi and Thaiodus ruchae, by contrast, have a compact, less differentiated enameloid very similar to that of C. prototypus. This suggests that crystallite compaction is a corollary of the evolution of serrated dentitions possessing single crystallite enameloids.
Czasopismo
Rocznik
Tom
Strony
181--184
Opis fizyczny
Bibliogr. 12 poz.,
Twórcy
Bibliografia
- AGASSIZ, J.L.R. 1833-1843. Recherches sur les Poissons Fossiles. 5 vols. 1420 pp. + suppl. Neuchâtel.
- ANDERSON, P.E., BENTON, M.J., TRUEMAN, C.N., PATERSON, B.A. & CUNY, G. 2007. Palaeoenvironments of vertebrates on the southern shore of Tethys : The nonmarine Early Cretaceous of Tunisia. Palaeogeography, Palaeoclimatology, Palaeoecology, 243, 118-131.
- CAPPETTA, H. 1987. Chondrichthyes II. In: H.-P. SCHULTZE (Ed.), Mesozoic and Cenozoic Elasmobranchii, 38, 1-193. Gustav Fischer Verlag; Stuttgart - New York.
- CAPPETTA, H., BUFFETAUT, E. & SUTEETHORN, V. 1990. A new hybodont from the Lower Cretaceous of Thailand. Neues Jahrbuch für Geologie und Paläontologie Monatshefte, 1990 (11), 659-666.
- CAPPETTA, H., BUFFETAUT, E., CUNY, G. & SUTEETHORN, V. 2006.A new elasmobranch assemblage from the Lower Cretaceous of Thailand. Palaeontology, 49, 547-555.
- CUNY, G. 2006. Emergence des requins néosélaciens et impact sur la paléoécologie des requins hybodontes, pp. 1-348, unpublished document de synthèse pour obtenir l’habilitation à diriger des recherches (HDR), Université Claude Bernard Lyon 1, Lyon.
- CUNY, G., OUAJA, M., SRARFI, D., SCHMITZ, L., BUFFETAUT, E. & BENTON, M.J. 2004. Fossil sharks from the Early Cretaceous of Tunisia. Revue de Paléobiologie, volume special 9, 127-142.
- CUNY, G., RIEPPEL, O. & SANDER, P.M. 2001. The shark fauna from the Middle Triassic (Anisian) of North-Western Nevada. Zoological Journal of the Linnean Society, 133, 285-301.
- DUFFIN, C.J. 2001. The hybodont shark, Priohybodus d’Erasmo 1960 (Early Cretaceous, northern Africa). Zoological Journal of the Linnean Society, 133, 303-308.
- HAMPE, O. 2003. Revision of the Xenacanthida (Chondrichthyes: Elasmobranchii) from the Carboniferous of the British Isles. Transactions of the Royal Society of Edinburgh: Earth Sciences, 93, 191-237.
- LUND, R. & MAPES, R.H. 1984. Carcharopsis wortheni from the Fayetteville Formation (Mississippian) of Arkansas. Journal of Paleontology, 58, 709-717.
- PREUSCHOFT, H., REIF, W.E. & MÜLLER, W.H. 1974. Funktionsanpassungen in Form und Struktur an Haifischzähnen. Anatomy and Embryology, 143, 315-344.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-2214-8497