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Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella

  • D. Clay Kelly (a1), Anthony J. Arnold (a1) and William C. Parker (a1)


The evolutionary origin of Morozovella angulata from its immediate ancestor, Praemurica uncinata, is preserved in Paleocene sediments from the Gulf of Mexico. This event represents the beginning of the morozovellid radiation and marks the first appearance of keeled planktonic foraminifera after the Cretaceous/Tertiary extinction. Parallel biometric and isotopic analyses were performed on size-segregated specimens from a succession of stratigraphic horizons. The biometric data reveal a temporal pattern of variation consistent with paedomorphosis. The appearance of angulose juvenile chambers in the otherwise rounded ancestral form (Praemurica uncinata) results in an allometry that becomes more pronounced upsection. At the origin of M. angulata, the juvenile morphology of the ancestor is retained throughout the entire ontogeny. Isotopic analysis of this sequence reveals the gradual acquisition of an increasingly heavy adult δ13C signal relative to that of the juvenile, while the δ18O data display no temporal or size-related trends. The temporal increase seen in the slope of the δ13C/size relationship may reflect the evolution of an increased dependency on photosymbionts.



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Alberch, P., Gould, S. J., Oster, G. F., and Wake, D. B. 1979. Size and shape in ontogeny and phylogeny. Paleobiology 5:296317.
Arkell, W. J., Kummel, B., and Wright, C. W. 1957. Mesozoic Ammonoidea. Pp. L80L465In Arkell, W. J., Furnish, W. M., Kummel, B., Miller, A. K., Moore, R. C., Schindewolf, C. H., Sylvester-Bradley, P. C., and Wright, C. W., eds. Mollusca 4, Cephalopoda, Ammonoidea. Part L of Moore, R. C., ed. Treatise on invertebrate paleontology. Geological Society of America and University of Kansas Press, Lawrence, Kans.
Arnold, A. J. 1983. Phyletic evolution in Globorotalia crassaformis (Galloway and Wissler) lineage: a preliminary report. Paleobiology 9:390397.
Arnold, A. J., Kelly, D. C., and Parker, W. 1992. Macro- and microevolutionary aspects of the early Paleogene recovery of the planktonic foraminifera. Fifth North American Paleontological Conference. Paleontological Society Special Publication No. 6, Abstracts and Programs.
Arnold, A. J., Kelly, D. C., and Parker, W. 1995. Causality and Cope's Rule: evidence from the planktonic foraminifera. Journal of Paleontology 69:203210.
Berger, W. H., Killingley, J. S., and Vincent, E. 1978. Stable isotopes in deep-sea carbonates: Box Core ERDC-92, west equatorial Pacific. Oceanological Acta 1:203216.
Berggren, W. A. 1965. Some problems of Paleocene–lower Eocene planktonic foraminiferal correlations. Micropaleontology 11:278300.
Berggren, W. A. 1968. Phylogenetic and taxonomic problems of some Tertiary planktonic foraminiferal lineages. Tulane Studies in Geology 6:122.
Berggren, W. A. 1969. Rates of evolution in some Cenozoic planktonic foraminifera. Micropaleontology 15:351365.
Berggren, W. A., and Miller, K. G. 1988. Paleogene tropical planktonic foraminiferal biostratigraphy and magnetobiochronology. Micropaleontology 34:362380.
Blow, W. H. 1979. The Cainozoic Globigerinida. Brill, Leiden, Netherlands.
Bolli, H. M. 1957. The genera Globigerina and Globorotalia in the Paleocene–lower Eocene Lizard Springs Formation of Trinidad, B. W. I. Pp. 6181in Loeblich, A. B., ed. Studies in foraminifera. United States National Museum Bulletin 215. McLean Paleontological Laboratory, Alexandria, Va.
Boersma, A., Premoli-Silva, I., and Shackleton, N. J. 1987. Atlantic Eocene planktonic foraminiferal paleohydrographic indicators and stable isotope paleoceanography. Paleoceanography 2:287331.
Brummer, G. J. A., Hemleben, C., and Spindler, M. 1987. Ontogeny of extant spinose planktonic foraminifera (Globigerinidae): a concept exemplified by Globigerinoides sacculifer (Brady) and G. ruber (d'Orbigny). Marine Micropaleontology 12:357381.
Cifelli, R. 1969. Radiation of Cenozoic planktonic foraminifera. Systematic Zoology 18:154168.
Corfield, R. M. 1987. Patterns of evolution in Palaeocene and Eocene planktonic foraminifera. pp. 93110in Hart, M. B., ed. Micropalaeontology of carbonate environments. British Micropalaeontological Society Series, Ellis Horwood.
Corfield, R. M., and Cartlidge, J. E. 1991. Isotopic evidence for the depth stratification of fossil and Recent Globigerinina: a review. Historical Biology 5:3763.
Corfield, R. M., and Granlund, A. H. 1988. Speciation and structural evolution in the Palaeocene Morozovella lineage (planktonic Foraminiferida). Journal of Micropalaeontology 7:5972.
Corfield, R. M., and Shackleton, N. J. 1988. Danian faunal succession: planktonic foraminiferal response to a changing marine environment. Geology 16:378380.
D'Hondt, S., Zachos, J. C., and Schultz, G. 1994. Stable isotopic signals and photosymbiosis in late Paleocene planktic foraminifera. Paleobiology 20:391406.
Garstang, W. 1929. The origin and evolution of larval forms. British Association for the Advancement of Science Report 192:7798.
Gould, S. J. 1977. Ontogeny and phylogeny. Belknap, Cambridge, Mass.
Hallock, P. 1985. Why are larger foraminifera large? Paleobiology 11:195208.
Hallock, P., Premoli-Silva, I., and Boersma, A. 1991. Similarities between planktonic and larger foraminiferal evolutionary trends through Paleogene paleoceanographic changes. Palaeogeography, Palaeoclimatology, Palaeoecology 83:4964.
Hemleben, C., Spindler, M., and Anderson, O. R. 1989. Modern planktonic foraminifera. Springer, New York.
Jennrich, R., and Sampson, P. 1990. Stepwise discriminant analysis. pp. 339358in Dixon, W. J., ed. BMDP statistical software manual, Vol. 1. University of California Press, Berkeley and Los Angeles.
Kelly, D. C., Arnold, A. J., and Parker, W. C. 1993. Paedomorphosis in the evolution of Morozovella angulata. Geological Society of America. Abstracts with Programs 25:A1.
Lohmann, G. P. 1995. A model for variation in the chemistry of planktonic foraminifera due to secondary calcification and selective dissolution. Paleoceanography 10:445457.
Luterbacher, H. 1964. Studies of some Globorotalia from the Paleocene and lower Eocene of the Central Apennines. Eclogae Geologicae Helvetiae 57:631730.
Martin, R. G. 1972. Structural Features of the Continental Margin, Northeastern Gulf of Mexico. U.S. Geological Survey Professional Paper 800:B1B8.
Martini, E. 1971. Standard Tertiary and Quaternary calcareous nannoplankton zonation. pp. 739777in Farinacci, A., ed. Proceedings of the Second Plankton Conference, Vol. 2.
McKinney, M. L., and McNamara, K. J. 1991. Heterochrony: the evolution of ontogeny. Plenum, New York.
Morozova, V. G. 1957. Foraminiferal superfamily Globigerinidea, superfamily nov., and some of its representatives. Akademia Nauk SSSR, Doklady, Moscow, 114:1111. [In Russian.]
Olsson, R. K., Hemleben, C., Berggren, W. A., and Liu, C. 1992. Wall texture classification of planktonic foraminifera genera in the lower Danian. Journal of Foraminiferal Research 22:195213.
Pavlow, A. P. 1901. Le Cretace inferieur de la Russie et sa faune. Nouvelle Memoires de la Societe Imperiale des Naturalistes de Moscou 21 (series nouvelle, livre 16).
Raup, D. M. 1966. Geometric analysis of shell coiling: general problems. Journal of Paleontology 40:11781190.
Rensch, B. 1959. Evolution above the species level. Columbia University Press, New York.
Schindewolf, O. H. 1925. Entwurf einer Systematik der Perisphincten. Neues Jahrbuch für Mineralogie. Beilage 52B:309343.
Schindewolf, O. H. 1936. Paläontologie, Entwicklungslehre und Genetik. Kritik und Synthese. Berlin.
Shackleton, N. J., Corfield, R. M., and Hall, M. A. 1985. Stable isotope data and the ontogeny of Paleocene planktonic foraminifera. Journal of Foraminiferal Research 15:321336.
Spero, H. J., and Lea, D. W. 1993. Intraspecific stable isotope variability in the planktic foraminifera Globigerinoides sacculifer: results from laboratory experiments. Marine Micropaleontology 22:221234.
Spero, H. J., Lerche, I., and Williams, D. F. 1991. Opening the carbon isotope “Vital Effect” black box, 2, quantitative model for interpreting foraminiferal carbon isotope data. Paleoceanography 6:639655.
Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H., and Jeffords, R. M. 1975. Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Institute, Article 62. University of Kansas Press, Lawrence, Kans.
Toumarkine, M., and Luterbacher, H. 1985. Paleocene and Eocene planktic foraminifera. pp. 87154In Bolli, H. M., Saunders, J. B., and Perch-Nielsen, K., eds. Plankton stratigraphy. Cambridge. University Press, Cambridge.
Wei, K. Y., Zhang, Z. W., and Wray, C. 1992. Shell ontogeny of Globorotalia inflata (I): growth dynamics and ontogenetic stages. Journal of Foraminiferal Research 22:318327.

Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella

  • D. Clay Kelly (a1), Anthony J. Arnold (a1) and William C. Parker (a1)


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