Читать книгу Hadrosaurs - David A. Eberth - Страница 35

The reconstruction in a bipedal pose (Fig. 2.19) is based primarily upon the proportions of the holotype skeleton (NHMUK R5764) and that of the referred skeleton (RBINS R57). The pectoral girdle and forelimb are notably less robust than those seen in either of the Valanginian taxa.

IGUANODON Mantell, 1825 IGUANODON BERNISSARTENSIS Boulenger (in Beneden, 1881)

Although extremely well known in mainland Europe, where more than 30 complete and partial skeletons have been recovered in Belgium, Germany, France, and Spain, Iguanodon bernissartensis is comparatively rare in Britain. The first occurrence of this morphotype was a hindlimb, pelvis, and some caudal vertebrae of large size collected in 1870 by John Whitaker Hulke at Brook Chine, Isle of Wight (late Barremian: NHMUK R2501-R2514; associated bones of an almost complete ilium and hindlimb that were given separate registered numbers). This material was eventually described and illustrated as Iguanodon seelyi Hulke, 1882 (Norman, 2012). Rather interestingly, from a purely historical perspective, this paper appeared shortly after Hulke had spent time studying the newly excavated Bernissart material in Brussels. Hulke was informed (as he quite candidly reported in this article) that formal description of the Belgian remains was not expected for a number of years; however, he must have been aware of the strong anatomical similarity between the material that he had discovered earlier and that of the large iguanodont skeletons from Bernissart. Hulke’s specimen consisted of the ilium, portions of both hindlimbs (including an almost complete pes), a major portion of a humerus, and a small number of caudal vertebrae (Norman, 2012); it should be noted there are also a number of additional complementary skeletal elements that are commensurate with the holotype that were also recovered from Brook Chine by Hulke and Rev. William Fox. Although these specimens were recovered at about the same time, they were not recorded in the same series of accession numbers. Dollo (1882) synonymized Hulke’s material with Iguanodon bernissartensis Boulenger, which had been named within the text of a critical report by P.-J. van Beneden (1881).

2.16. Mantellisaurus. Attempted reconstruction of the articulated pelvic bones in left lateral view. The curvature of the ischial shaft is exaggerated; the shaft is typically straighter, more angular-sided proximally, and has a smaller distal “boot” (from Norman, 1977, 2011b). Abbreviations: ac, acetabulum; boss, faceted dorsal margin of the iliac blade; br.f, brevis fossa; il, ilium; is, ischium; obt, obturator process; obt.f, obturator foramen; prp, preacetabular process of the ilium; pu, pubis; sac, supra-acetabular crest; step, beveled external surface of the ischiadic peduncle.

2.17. Mantellisaurus atherfieldensis, holotype of I. atherfieldensis Hooley, 1925, NHMUK R5764. The principal bones of the hindlimb. (A, B) femur in anterior (dorsal) and medial views, respectively; (C, D) the crus in anterior (dorsal) and medial views, respectively. Abbreviations: 4t, fourth trochanter; aig, anterior intercondylar groove; ast, astragalus; at, anterior (lesser) trochanter; cal, calcaneum; cn, cnemial crest; fi, fibula; gt, greater trochanter; h, femoral articular head; ti, tibia (same as Norman, 2011b:fig.27.46).