Fig. 13 in Dimerelloid brachiopod Dzieduszyckia from Famennian hydrocarbon seep deposits of Slaven Chert, Nevada, USA, with insights into systematics and paleoecology of the Dimerelloidea

Fig. 13. Number of costae per width in centimeters of fragments in Dzieduszyckia sp. from Nevada. A. Histogram of data from all measured specimens. B. Best fit regression line assuming variance within a single species, in which costae frequency width skews toward lower values. C. Separation into two distinct species of brachiopods, with low (ca. 0.5 costa/mm) and high (ca. 1.0 costa/mm) median costae frequencies with best fit regression lines. Photos show one field sample with a representative of each group.