Three-Dimensional Bookstein Shape Coordinates and Functional Morphology of Passive Suspension Feeding in Composita (Brachiopoda, Athyridida)

  • Author / Creator
    Collins, Benjamin M. J.
  • The effects of shell morphology on passive fluid circulation are examined
    in Late Mississippian through Late Pennsylvanian Composita
    (Brachiopoda, Athyridida) from Texas, Kentucky, and Iowa. The first
    three-dimensional derivation of Bookstein shape coordinates is given in
    association with an in-depth discussion of the advantages and potential
    drawbacks of the technique for geometric shape analysis applications.
    Three-dimensional morphometric analysis of Composita shows a single
    shape distribution corresponding to progressive differentiation of the
    commissure into vertically displaced parasulcate, lateral, and sulcate
    gapes with increasing shell size, indicating an ontogenetic shape change
    trend. Gaping models of three specimens (including a simulated
    lophophore in the largest specimen) representative of different ontogenetic
    stages were used to observe the effects of morphology on passive flow
    circulation in a recirculating flume tank. All models showed
    medially-inhalant and laterally-exhalant passive circulation when oriented
    with the sulcus facing upstream, with more vigorous flow associated with
    increasing shell size.

  • Subjects / Keywords
  • Graduation date
    Spring 2014
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.