Fig. 2

The shell of UMMP 9318, referred to Stylemys nebrascensis. A Photograph in dorsal view. B As A, with interpretative line drawing. C Photograph in ventral view. D As C, with interpretative line drawing. Note that sutures between shell bones are indicated in a thin line style and labelled in regular font, whereas contacts between scutes are indicated in a thick line style and labelled in bold font. Anatomical features that are not bones or scutes are labelled in italics. Lone Roman numerals indicate neurals. Features labelled in red indicate traits that are important for the taxonomic referral of the specimen to Stylemys nebrascensis. Arabic numbers cross-refer to diagnostic traits in full text: 1a, small specimens size; 1b, thick bone; 1c, high shell doming; 2a, broad and short anterior plastral lobe; 2b, absence of gular protrusions; 3, partially preserved neurals with hexagonal shapes with anteriorly short sides; 4a, laterally convex humero-pectoral sulcus; 4b, position of humero-pectoral sulcus posterior to entoplastron; 5, small inguinal scute; 6, shallow fossa posterior to dorsally thickened epiplastral margin; 7, gulars crossing the entoplastron; 8, medially longer anals than femorals. Abbreviations: ab, abdominal; an, anal; ax, axillary; co, costal; ent, entoplastron; epi, epiplastron; fem, femoral; gu, gular; hu, humeral; hyo, hyoplastron; hyp, hypoplastron; ing, inguinal; mar, marginal; pec, pectoral; per, peripheral; tepm, thick epiplastral margin; xi, xiphiplastron. The photographs that form the basis of this figure were taken by Adam Rountrey and are copyrighted by the Regents of the University of Michigan and were shared with the authors under a CC-BY NC 4.0 license