A MORPHOLOGICAL COMPARISON OF RECENT AND PLEISTOCENE PHRONTIS VIBEX (MOLLUSCA: GASTROPODA: NASSARIIDAE) FROM SOUTHWESTERN FLORIDA
Specimens used for this pilot study were photographed and the linear variables (total length, body whorl length and width, aperture length and width, penultimate whorl length and width, width of the parietal shield, thickness of outer lip, angle of spire, and length of the spire) were extracted from the photographs using the software ImageJ. A Principal Component Analysis (PCA) using eleven linear measurements was conducted. The Recent and fossil specimens do not form distinct groups in the PCA ordination plots and the morphological variability is comparably high for both Recent and fossil specimens. These are preliminary results and future landmark based Geometric Morphometric Analyses, based on an expanded specimen-level dataset should help us to assess preliminary patterns of body size and shape in fossil and Recent Phrontis vibex specimens.