Ikrandraco machaerorhynchus ( Seeley, 1870 ), 2020

Averianov, A. O., 2020, Taxonomy of the Lonchodectidae (Pterosauria, Pterodactyloidea), Proceedings of the Zoological Institute of the Russian Academy of Sciences 324 (1), pp. 41-55 : 49-50

Ikrandraco machaerorhynchus ( Seeley, 1870) comb. nov.

( Figs 3 , 4)

Ptenodactylus machaerorhynchus : Seeley 1869: xvi.

Ptenodactylus oweni : Seeley 1869: xvi.

Ptenodactylus microdon : Seeley 1869: xvi.

Ornithocheirus machaerorhynchus : Seeley 1870: 113, pl. 12, figs 1–2.

Ornithocheirus oweni : Seeley 1870: 115.

Ornithocheirus microdon syn. nov.: Seeley 1870: 116, pl. 12, figs 6–7; Wellnhofer 1978: 58.

Lonchodectes machaerorhynchus : Hooley 1914: 535; Unwin 2001: 195, fig. 12D–E.

Lonchodectes microdon : Hooley 1914: 535; Unwin 2001: 195, fig. 11C–F.

Lonchodectes oweni : Hooley 1914: 535.

Lonchodraco machaerorhynchus : Rodrigues and Kellner 2013: 27 , fig. 5.

Lonchodraco (?) microdon : Rodrigues and Kellner 2013: 29 , fig. 6.

Holotype. CAMSM B54.855 , partial mandibular symphysis.

Type locality and horizon. Cambridge, Cambridgeshire, England; Cambridge Greensand (Albian).

Holotype. IVPP V18199 , partial skeleton.

Type locality and horizon. Lamadong, Jianchang County, Liaoning Province, China; Jiufotang Formation (Aptian).

Referred specimens. IVPP V18406 , partial skeleton; Sihedang , Lingyuan County, Liaoning Province, China; Jiufotang Formation (Aptian). The third specimen of I. avatar was announced by Chen et al. (2018) .

Diagnosis. Differs from I. machaerorhynchus by a relatively deeper mandibular crest and approximately 3.8 alveoli per 3 cm of alveolar margin.

Comments. In the supplementary information to Wang et al. (2014), a specimen number IVPP V18904 was applied to both the holotype and the referred specimen .

large mandibular crest. Ornithocheirus machaerorhynchus was previously reconstructed as having the deepest point of the mandibular crest near the anterior end of the dentary ( Unwin 2001: fig. 12D), but there is no evidence for this. Here it is reconstructed as having the deepest point of the mandibular crest at the middle of the mandibular symphysis (Fig. 4D), similar to the condition present in L. giganteus and I. avatar .

Figures

Fig. 3. Rostrum fragments of Ikrandraco machaerorhynchus (Seeley, 1870). A–D – CAMSM B54486, holotype of Ornithocheirus microdon Seeley, 1870, in lateral (A), anterior (B), ventral (C), and posterior (D) views (images in A and C are flipped horizontally). E, F – CAMSM D54439, holotype of Ornithocheirus oweni Seeley, 1870, in anterior (E), ventral (F), and posterior (G) views. Modified from Unwin (2001: fig. 11C, D) and Rodrigues and Kellner (2013: fig. 6D, F, H, J, L). Scale bar = 10 mm.