SPECIES DIFFERENTIATION IN THE PERMIAN GENUS HAMIAPOLLENITES WILSON, 1962 IN OKLAHOMA
Here we investigate species differentiation in Permian Hamiapollenites by sampling grains in multiple samples in multiple cores through the Wellington Formation (Sumner Group: Permian) of Oklahoma. By measuring numbers and widths of striae and furrows, sizes of the corpus and sacci, and describing ornament, we seek to discover and quantify morphological variation at various scales—within samples, between samples in a section, and among sections—in order to differentiate repeatable clusters of morphology indicative of different species.
Initial studies have focused on variation within samples and although there is substantial variation, multivariate analyses based on those measurements have produced no evidence for the occupation of distinct areas in morphospace. Although our analyses may provide evidence for or against those species concepts evident in the literature, ultimately, sampling the contents of individual sporangia from polleniferous organs will provide the best evidence of true species diversity.