[D] Dollodon bampingi [nG]
Cretaceous Early Barremian Aptian
Ornithischia Ornithopoda Iguanodontia Iguanodontidae Nomen Nudem
Wealden Beds, Upper Wealden Supergroup (= Hainaut Group), Belgium
For Louis Dollo, who first described this and other Bernissart iguanodonts. Named in honour of Mr D. Bamping for his support of this research,
Tooth positions over 25? in dentary. Otherwise as for the type and only determinate species. Probably modest sized as adults at 6+ m and 1+ tonnes. Overall lightly constructed. Premaxillary tip to anterior orbital rim/latter to paraoccipital process tip length ratio ~1.6 via elongation of posterior nasal, maxillary process of premaxilla and maxilla; dentary pre-coronoid process length/minimum depth ratio over 5.
Maxillary process of premaxilla shallow. Dorsal apex of maxilla set posteriorly. Antorbital fossa and fenestra reduced. Lacrimal short, does not contact nasal. Accessory palpebral absent. Posterior border of occiput straight. Lateral temporal fenestra small. Posterior portion of jugal short. Quadratojugal short. Quadrate short, transversely narrow, shaft curved, lateral foramen set high, dorso-posterior buttress small. Diastema short.
Dorsosacral/ hindlimb length ratio ~1.2. Posterior dorsal centra not compressed anteroposteriorly. Neural spines of dorsals, sacrals and caudals form moderately tall sail. 7 fused sacrals. Scapula blade narrow and constricted at middle of blade, base rather narrow, acromion process placed ventrally and directed distally. Forelimb ~55% of hindlimb length.
Deltopectoral crest of humerus distally placed, fairly large and incipiently hatchet shaped. Manus narrow. Manual phalanx 1 of digit I present, pollex spike and other unguals moderate in size. Main body of ilium shallow. Prepubic process of pubis deep. Femoral shaft moderately curved. Metatarsal I present, II long.
Carpenter & Ishida (2010) Early and “Middle” Cretaceous Iguanodonts in Time and Space Journal of Iberian Geology 36 (2) 145-164
Dollodon seelyi (Hulke 1882a)
= Iguanodon mantelli von Meyer 1832 (in part)
=Iguanodon seelyi Hulke 1882a
= Iguanodon atherfieldensis Norman 1986
=Dollodon bampingi Paul 2008
Bernissart, Belgium; Brook, Isle of Wight, England.
Sainte-Barbe Clays; Wessex Formation.
Barremian (Martill, personal communication, 2010).
Paul (2008) erected Dollodon bampingi for a specimen previously referred to Iguanodon atherfieldensis by Norman (1986) and to Iguanodon mantelli by Dollo (1882). The ilium of Dollodon bampingi is practically indistinguishable from that of Iguanodon seelyi Hulke 1882a, and therefore the species seelyi has priority over bampingi.
The distinctiveness of Dollodon from Iguanodon was noted previously by Seeley (1887a) based on the specimen referred to I. seelyi. The ilium of Dollodon is characterized by a very long, tapering postacetabular process in which the ventral margin slopes dorsally. The preacetabular process is long (almost half the ilium length), parallel-sided and angled anteroventrally. The lateral iliac crest is short, and the ischial peduncle expanded onto the lateral surface.