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A–D, Measurements taken on the six spinosaurine quadrates from the Kem Kem beds of Morocco in A, lateral; B, posterior, C, medial; and D, ventral views; E, location of the ten landmarks used in the morphometric analyses in an idealized mandibular articulation of a non-avian theropod in ventral view. Abbreviations: ecc, ectocondyle; enc, entocondyle, ics, intercondylar sulcus.
