. Bulletin of the British Museum (Natural History), Geology. B apgp mpgp Sq mpgp aP9P. mpgp apgp Text-figure 48 Plagiolophus, glenoid region. A-C, holotype of Plagiolophus curtisi curtisi sp. & subsp. nov. (M26176) from Barton Cliff. D, P. fraasi Meyer (Ml733) from the Phosphorites du Quercy. A, lateral view of right glenoid region; B, posterior view of right glenoid region; C, ventral view shown as right glenoid region, but composite of right and left; D, ventral view of left glenoid region (reversed). Abbreviations: Al = alisphenoid; apgp = accessory postglenoid process; gf= glenoid foss

- Image ID: RGHMNW
. Bulletin of the British Museum (Natural History), Geology. B apgp mpgp Sq mpgp aP9P. mpgp apgp Text-figure 48 Plagiolophus, glenoid region. A-C, holotype of Plagiolophus curtisi curtisi sp. & subsp. nov. (M26176) from Barton Cliff. D, P. fraasi Meyer (Ml733) from the Phosphorites du Quercy. A, lateral view of right glenoid region; B, posterior view of right glenoid region; C, ventral view shown as right glenoid region, but composite of right and left; D, ventral view of left glenoid region (reversed). Abbreviations: Al = alisphenoid; apgp = accessory postglenoid process; gf= glenoid foss
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Image ID: RGHMNW
. Bulletin of the British Museum (Natural History), Geology. B apgp mpgp Sq mpgp aP9P. mpgp apgp Text-figure 48 Plagiolophus, glenoid region. A-C, holotype of Plagiolophus curtisi curtisi sp. & subsp. nov. (M26176) from Barton Cliff. D, P. fraasi Meyer (Ml733) from the Phosphorites du Quercy. A, lateral view of right glenoid region; B, posterior view of right glenoid region; C, ventral view shown as right glenoid region, but composite of right and left; D, ventral view of left glenoid region (reversed). Abbreviations: Al = alisphenoid; apgp = accessory postglenoid process; gf= glenoid fossa; mpgp = main postglenoid process; Pat = parietal; pgf = postglenoid foramen; Sq = squamosal; tf = temporal foramen. All x 1. The mandibular symphysis is massive for housing the canine roots. Its ventral edge is angled anterodorsally below a point just behind the emergence of the canines. In contrast the small symphyses of other species have an even, anterior tapering, shape. The symphysis in M26176 terminates an unknown distance in front of the premolar row; in P. annectens it is just in front of P2. The maximum length measurable on the lower diastemata of M26176 is 230 mm, the same as that estimated for the complete upper diastema. As there was apparently no tooth immediately following the breakage of the lower diastema, P! was probably absent, P2 begin- ning the row behind the main mental foramen. In dorsal view the symphysis is only slightly concave laterally and the diastematal ridges are almost straight. In other species it is laterally more deeply concave and so are the ridges. Like the palate, the interdiastematal symphysial concavity is shallower in P. curtisi than in other species of Plagiolophus. The anteromedia! edge of the ascending ramus forms an acutely angled ridge because the masseteric ridge lies posterolateral to it. This contrasts with other species where both ridges normally lie side by side and are weaker and more rounded. The curvature of the posterior e

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