The Giant Cretaceous Coelacanth (Actinistia, Sarcopterygii) Megalocoelacanthus dobiei Schwimmer, Stewart & Williams, 1994, and Its Bearing on Latimerioidei Interrelationships
Figure 13
Megalocoelacanthus dobiei Schwimmer, Stewart & Williams, 1994, AMNH FF 20267 from lower Campanian of the Niobrara Formation.
Left lower jaw. A, lateral view. B, medial view. Abbreviations: Ang, angular; art.Q, surface for articulation with the quadrate; co.pr.Ang, coronoid process of the angular; De, dentary; d.p, enlarged sensory pore within the dentary; f.pop.s.c, opening for the preopercular sensory line canal; f.V.m, foramen for the mandibular ramus of the trigeminal nerve; f.VII.m.ext, foramen for the external mandibular ramus of the facial nerve; gr.VII.m.int, groove for the internal mandibular ramus of the facial nerve; i.add.md, insertion point for the adductor mandibulae muscle; i.art-hy.lig, insertion point for the articular-hyomandibular ligament; i.surf-a.intermd, insertion surface for the anterior ramus of intermandibular muscle; Mm, mentomeckelian; m.s.c, mandibular sensory line canal; Rart, retroarticular; ?sop.br, subopercular branch of the preopercular canal; Spl, splenial. Scale bar = 10 cm.