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Why do Univalve Shells of Gastropods Coil so Tightly? A Head-Foot Guidance Model of Shell Growth and its Implication on Developmental Constraints

In: Morphogenesis and Pattern Formation in Biological Systems

Author

Listed:
  • Rihito Morita

    (Natural History Museum and Institute)

Abstract

Summary Tight coiling with whorl overlap is the most frequent mode of shell coiling in gastropods. A new model of shell growth, the “head-foot guidance model”, implies that the contact of the head-foot mass with the mantle edge plays the main role in producing tight coiling. Computer simulation of the model suggests that the head-foot guidance mechanism imposes developmental constraints on the evolution of gastropods; 1.) bilaterally symmetric coiling is associated with bilaterally symmetric musculature of the foot mass; 2) tight coiling is associated with the contact of the head-foot mass and the mantle edge; 3) insertion of the foot muscle occurs in gastropods with an uncoiled shell.

Suggested Citation

  • Rihito Morita, 2003. "Why do Univalve Shells of Gastropods Coil so Tightly? A Head-Foot Guidance Model of Shell Growth and its Implication on Developmental Constraints," Springer Books, in: Toshio Sekimura & Sumihare Noji & Naoto Ueno & Philip K. Maini (ed.), Morphogenesis and Pattern Formation in Biological Systems, chapter 29, pages 345-354, Springer.
    • Handle: RePEc:spr:sprchp:978-4-431-65958-7_29
    DOI: 10.1007/978-4-431-65958-7_29
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