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Whale barnacles: exaptational access to a forbidden paradise

  • Adolf Seilacher (a1)

Of all sessile filtrators, only some species of acorn barnacles managed to permanently settle on whales. Their key exaptation was probably a kind of biochemical cleaning process, which could be modified to penetrate into the host's dead cutis. Anchorage was further increased by coring prongs out of the whale skin (Coronula) or by transforming the wall into a cylindrical tube that added new rings at the base, while old ones flaked off at the surface in tandem with skin shedding (Tubicinella). Xenobalanus even everted its naked body into a stalked structure and reduced the wall plates to a minute, but highly efficient, anchor. Cryptolepas combines the strategies of Tubicinella and Coronula, but with a different structure of the radial folds. Because of a shared exaptational inventory, it is impossible to unravel phylogenetic relationships within the Coronulida from skeletal morphology alone.

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Collins, D., and Rutkin, D. M. 1981. Priacansermarinus barnetti, a probable lepadomorph barnacle from the Middle Cambrian Burgess Shale of British Columbia. Journal of Paleontology 55:10061015.
Darwin, C. 1854. A monograph on the sub-class Cirripedia with figures of all the species. Royal Society, London.
Gould, S. J. 1971. Tübingen meeting on form. Journal of Paleontology 45:10421043.
Gould, S. J., and Vrba, E. 1982. Exaptation—a missing term in the science of form. Paleobiology 8:415.
Gutmann, W. F. 1960. Funktionelle Morphologie von Balanus balanoides. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft 500. Frankfurt am Main.
Newman, W. A., Zullo, V. A., and Withers, T. H. 1969. Cirripedia. Pp. R206R295in Brooks, H. K. et al. Arthropoda 4, Vol. 1. Part R ofMoore, R.C., ed. Treatise on invertebrate paleontology. Geological Society of America, Boulder, Colo., and University of Kansas, Lawrence.
Seilacher, A. 1973. Fabricational noise in adaptive morphology. Systematic Zoology 22:451465.
Seilacher, A. 1992. Whale barnacles: how an evolutionary dream could become true. Mitteilungen des Sonderforschungsbereichs 230(8):131136. Universität Stuttgart.
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  • ISSN: 0094-8373
  • EISSN: 1938-5331
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