Date of Award

11-1-1991

Document Type

Thesis

Degree Name

Master of Arts (MA)

Department

Biology

First Advisor

Dr. George Engelmann

Abstract

A scanning electron microscopic examination of Pennsylvanian conodonts has defined a total of eight discrete secondary surface features. These features are interpreted to have been formed by a toothlike in vivo functionality of elements within assemblages. Four general types of features have been identified and described. Attritional form 1 (AT1) features are easily detected due to the gross nature of the wear. These specimens exhibit AT1. Attritional form 2 (AT2) is of a subtle nature typically expressed as furrows and, at times, associated with irregular planer features. Two specimens exhibit this type of attrition. Attritional form 3 (AT3) is interpreted to represent repair, by growth lamellae addition, which has not totally removed visible evidence of damage. This form is considered intermediate between AT1 and AT2. One specimen exhibits AT3. Attritional form 4 (AT4) features are linear “gouges” which cross cut primary ornamentation features of denticles. AT4 is exhibited by two specimens.

Comments

A Thesis Presented to the Department of Biology and the Faculty of the Graduate College University of Nebraska In Partial Fulfillment of the Requirements for the Degree Master of Science University of Nebraska at Omaha. Copyright 1991 Edwin Booth Bave IV.

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