Extended Data Figure 1: Images of the holotype skull of Cotylocara macei (CCNHM-101). | Nature

Extended Data Figure 1: Images of the holotype skull of Cotylocara macei (CCNHM-101).

From: A new fossil species supports an early origin for toothed whale echolocation

Extended Data Figure 1

a, Parasagittal section of the skull generated from CT slices demonstrating the anatomical basis for klinorhynchy (downturned face and rostrum). Red lines follow the axis of the basicranial stem and the rostrum; together they form an angle of approximately 20°. This slice is situated <10 mm to the right of the median plane. Other slices, medial and lateral to this one, display similar angles. b, Medial view of the right dentary. Bo, basioccipital; Bs, basisphenoid; cc, cranial cavity; co, mandibular condyle; cp, coronoid process; ip, interparietal; mf, mandibular foramen; ms, surface for mandibular symphysis; Mx, Maxilla; Na, nasal; n-1, penultimate tooth; n-5, fifth from the last tooth; Pa, parietal; pf, postnarial fossa; Px, premaxilla; So, supraoccipital; xn, external bony nares.

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