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Some analytic methods in the study of ontogeny in fossils with accretionary skeletons

Published online by Cambridge University Press:  20 December 2017

M. J. S. Rudwick
M. J. S. Rudwick*
Affiliation:
Sedgwick Museum, Cambridge, England
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Abstract

Paleontological studies of organisms with accretionary skeletons should take full account of the implications of accretionary growth. These implications are discussed in this paper with examples from the Brachiopoda.

Descriptions of morphology should recognize the ‘dynamic’ character of preserved structures as embodying a sequence of previous growth stages; ‘static’ descriptions can result in misleading morphological characters and spurious taxonomic distinctions. Analysis of ontogeny in dynamic terms, and particularly the topological comparison of structures of varied form, can help distinguish true from false homologies, and hence evaluate the probability of inferred phyletic pathways. Such analyses can also be used to infer the morphogenetic ‘rules’ that governed the development of particular structures and, hence, to locate major phyletic innovations and discontinuities in structure.

Four distinct classes of functional interpretation are applicable to accretionary structures. Functional analysis of structures developing through ontogeny can help to discriminate between analogical and homological resemblances and to identify functional changes during ontogeny. Likewise, functional interpretation of postulated transformations of structure can be used to evaluate the phylogenies suggested; interpretation of structures that are functionally dependent on absolute size can also help to identify major adaptive innovations and discontinuities.

Type
Research Article
Information
Journal of Paleontology , Volume 42 , Issue S2: Paleontological Society Memoir 2. Paleobiological Aspects of Growth and Development: A Symposium , September 1968 , pp. 35 - 49
Copyright
Copyright © 1968 Paleontological Society 

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References

Atkins, D., 1960, The ciliary feeding mechanism of the Megathyridae (Brachiopoda), and the growth stages of the lophophore: Jour. Mar. Biol. Ass. U.K., v. 39, p. 459–479.Google Scholar
George, T. N., 1932, The British Carboniferous reticulate Spiriferidae: Geol. Soc. London, Quart. Jour., v. 88, p. 516–573.Google Scholar
Gould, S. J., 1967, Allometry and size in ontogeny and phylogeny: Biol. Rev., v. 41, p. 587–640.Google Scholar
Muir-Wood, H. M., & Cooper, G. A., 1960, Morphology, classification and life habits of the Productoidea (Brachiopoda): Geol. Soc. America, Mem. 81, 447 p.Google Scholar
Raup, D. M., 1966, Geometric analysis of shell coiling: General problems: Jour. Paleontology, v. 40, p. 1178–1190.Google Scholar
Rudwick, M. J. S., 1959, The growth and form of brachiopod shells: Geol. Mag., v. 96, p. 1–24.Google Scholar
Rudwick, M. J. S., 1962, Filter-feeding mechanisms in some brachiopods from New Zealand: Jour. Linn. Soc. Lond., Zool., v. 44, p. 592–615.Google Scholar
Rudwick, M. J. S., 1964, The inference of function from structure in fossils: Brit. Jour. Philos. Sci., v. 15, p. 27–40.Google Scholar
Rudwick, M. J. S., 1965, Sensory spines in the Jurassic brachiopod Acanthothiris : Palaeontology, v. 8, p. 604–617.Google Scholar
Rudwick, M. J. S., 1968, The feeding mechanisms and affinities of the Triassic brachiopods Thecospira Zugmayer and Bactrynium Emmrich: Palaeontology, v. 11 (in press).Google Scholar
Rudwick, M. J. S., & Cowen, R., 1968, The functional morphology of some aberrant Strophomenide brachiopods from the Permian of Sicily: Boll. Soc. Paleont. Ital., v. 6, p. 113–176.Google Scholar
Thompson, D'A. W., 1942, On growth and form: Cambridge, Cambridge Univ. Press (2nd ed.), 1116 p.Google Scholar
Williams, Alwyn, 1949, New Lower Ordovician brachiopods from the Llandeilo-Llangadock district, Part I: Geol. Mag., v. 86, no. 3, p. 161–174; Part II, ibid., no. 4, p. 226–238.Google Scholar
Williams, Alwyn, 1953, The morphology and classification of the oldhaminoid brachiopods: Washington Acad. Sci. Jour., v. 43, p. 279–287.Google Scholar