Functional constraints on coiling geometry and aperture inclination in gastropods

Koji Noshita, Takahiro Asami, Takao Ubukata

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We studied the morphological diversity of gastropod shell forms from the viewpoint of theoretical morphology, emphasizing the relationships of shell form to postural stability and the available space for soft body, which we assessed in terms of the moment of force and soft-tissue ratio calculations, respectively. The results of computer simulations suggest a functional trade-off between postural stability and available space for soft body: a compact shell possessing a low spire and small umbilicus exhibits high postural stability, whereas a less overlapped shell form with a high spire and large umbilicus makes available space for soft body. A functional morphospace analysis using theoretical models reveals that outward and downward inclination of the aperture moderates the functional trade-off between these parameter values and permits compatibility between stable posture and efficient shell construction. The hypothetical optimum that realizes this compatibility is consistent with the observed range of forms estimated from 359 extant gastropod species. The biometric results also suggest that land snails are more highly constrained than marine species in achieving a balance between postural stability and available space for soft body.

Original languageEnglish
Pages (from-to)322-334
Number of pages13
JournalPaleobiology
Volume38
Issue number2
DOIs
Publication statusPublished - Mar 1 2012

Fingerprint

Umbilicus
Gastropoda
shell (molluscs)
gastropod
Postural Balance
shell
geometry
umbilicus
Snails
Posture
Computer Simulation
Theoretical Models
trade-off
biometry
posture
computer simulation
snail
snails

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Agricultural and Biological Sciences(all)
  • Palaeontology

Cite this

Functional constraints on coiling geometry and aperture inclination in gastropods. / Noshita, Koji; Asami, Takahiro; Ubukata, Takao.

In: Paleobiology, Vol. 38, No. 2, 01.03.2012, p. 322-334.

Research output: Contribution to journalArticle

Noshita, Koji ; Asami, Takahiro ; Ubukata, Takao. / Functional constraints on coiling geometry and aperture inclination in gastropods. In: Paleobiology. 2012 ; Vol. 38, No. 2. pp. 322-334.
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