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Transposed Hinge Structures in Lamellibranchs


Popenoe, Willis Parkison (1933) Transposed Hinge Structures in Lamellibranchs. Master's thesis, California Institute of Technology. doi:10.7907/XXJF-9T66.


In the course of study of a collection of Eocene fossils from Claiborne, Alabama, the senior author of this paper noticed two valves, one right and one left, of the lamellibranch Venericardia parva Lea, in which the dentition is partially transposed. Subsequently, the author made an examination of more than five thousand lamellibranch valves, representing both recent and fossil shells, in search of further examples of hinge-transposition. We have found a total number of twenty-six valves exhibiting this variation.

Study of these specimens has revealed some hitherto unreported facts regarding the principles of hinge-transposition. Therefore in this paper, we shall describe and discuss these specimens, and shall present such conclusions as seem justified by the data assembled.

Citations to the literature are made by author, date, and page, referring to the list at the end of the paper.

Item Type:Thesis (Master's thesis)
Subject Keywords:Paleontology ; Geology
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Paleontology
Minor Option:Geology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Stock, Chester
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1933
Record Number:CaltechTHESIS:01082010-083809239
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5503
Deposited By: Tony Diaz
Deposited On:15 Jan 2010 19:40
Last Modified:03 Oct 2019 23:44

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