. Bulletin. Natural history; Natuurlijke historie. j pro bo 5 cm. B Fig. 8. Reconstructed skull of Corosaurus alcovensis, based upon UW 5485 (mandibular suture patterns unknown). A—left lateral aspect; B—posterior aspect, bo = basioccipital; bs = basisphenoid; cp = coronoid process; de = dentary; en = external naris; eo = exoccipital; ept = epipterygoid; f = frontal; fm = foramen magnum; j = jugal; mx = maxilla; n = nasal; o = orbit; op = opisthotic; p = parietal; pf = postfrontal; pmx = premaxilla; po = postorbital; pfr = prefrontal; pro = prootic; pt = pterygoid; ptf = posttemporal fenestra;
. Bulletin. Natural history; Natuurlijke historie. j pro bo 5 cm. B Fig. 8. Reconstructed skull of Corosaurus alcovensis, based upon UW 5485 (mandibular suture patterns unknown). A—left lateral aspect; B—posterior aspect, bo = basioccipital; bs = basisphenoid; cp = coronoid process; de = dentary; en = external naris; eo = exoccipital; ept = epipterygoid; f = frontal; fm = foramen magnum; j = jugal; mx = maxilla; n = nasal; o = orbit; op = opisthotic; p = parietal; pf = postfrontal; pmx = premaxilla; po = postorbital; pfr = prefrontal; pro = prootic; pt = pterygoid; ptf = posttemporal fenestra; q = quadrate; ret p = retroarticular process; so = supraoccipital; sq = squamosal. tall as has been reconstructed by Case (1936, fig. 3). The left squamoso-postorbital bar is not preserved, and both quadrate regions are crushed. As for the preorbital surfaces, compression and concomitant fracturing of the rostrum has obscured the bone relationships and nowhere are the sutures as clear as those of the skull table. The size and shape of the external nares are nonetheless obvious and little broadening of the rostrum has occurred. The left side of the skull is generally w^ell preserved throughout its length and allows an accurate reconstruction of the skull's gross morphology (Figs. 7 and 8). Both the nostril and the eye faced laterally to a slight degree. The nares are relatively smaller and the orbits larger than in Case's (1936, figs. 2 and 3) reconstruction. The oblique position of the teeth as noted by Case is undoubtedly true for the anterior rostrum, but the left maxilla has certainly been displaced horizontally and the maxillary dentition should be more correctly regarded as vertical in position. This conclusion is borne out by comparison with the largely undisturbed right maxilla and the configuration of the lower jaw of Corosaurus. The skull of the type specimen is nearly 13 cm long, with a low, broad facial region and a narrow, although short (approximately cm)
Size: 2292px × 1090px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiv, booksubjectnaturalhistory
