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

  • Shape analysis
  • Suspension feeding
  • Functional morphology

• Graduation date

  Spring 2014

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3KP7TZ3M

• 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.