Pteranodon postcervical comparisons.
Contra earlier studies (Bennett 1991, 1992, 1993, 1994, 2001) post-cranial variation was present in Pteranodon. A. P. ingens YPM 1175. B. P. sp. UNSM 50036. C.Hypothetical hatchling at 1/8 (12%) the shoulder height of the P. ingens along with an egg with a diameter to fit the pelvic aperture and a length to accommodate the elongated rostrum, as in the Pterodaustro embryo (Chiappe et al. 2004), which takes up nearly the entire length of its shell. An elongated crest of any sort would not have fit inside such an egg and so must have developed after hatching, recapitulating phylogeny. D. P.sp. FHSM VP 2062. These three nested outside the P. sternbergi clade. E. P. sp. UUPI R197, a more basal pterosaur. F. YPM 2525 in which the scapula is not fused to the coracoid. G. SMU 76476, the oldest Pteranodon (Myers 2010) reconstructed with the proportions of UUPI R197. H. The same reconstructed with the proportions of Eopteranodon. I. KUVP 977 (Bennett 1991, 2001) J. Pteranodon longiceps? FHSM VP 2183, formerly SMM 11402 (Miller 1971b, see skull Fig. 1l). K. FFHM 1975.438. L. AMNH FR 6158. M. FHSM VP-696. N. YPM 42804 (Bennett 1991, 2001).  O. This is Nyctosaurus: YPM 2501 (Bennett 1991, 2001). Scale bar is 40 cm.