Terebratulide body size measurements from museum specimens

Data on the maximum body size of terebratulide genera collected via measurements of museum specimens. More than 2000 intact specimens of Paleozoic terebratulides were measured in the collections at the Natural History Museum (London), the National Museum of Natural History (Washington, D.C.), and the Yale Peabody Museum (New Haven, Conn.). Each specimen was aligned and photographed from two orthogonal angles, one angle representing the commissure margin and the other representing the “profile,” or the side view. 101 equally spaced coordinates were sampled around the commissure margin, using the software program tpsDig v. 1.4 written by James Rohlf and then scaled to millimeters. Centroid size for was then calculated each individual, using the coordinates sampled from the commissure view. Each genus is represented by the individual specimen with the largest measured centroid size. Centroid sizes were gathered for 28 Devonian genera, with the median number of specimens measured per genus equal to 5.5 (interquartile range was 2 to 18.25 specimens).