[D] Parasaurolophus tubicen [Su]
Cretaceous Late Maastrichtian
Ornithischia Ornithopoda Hadrosauridae Lambeosaurinae
Kirtland Formation, New Mexico, US
Parasaurolophus walkeri (Parks, 1922) > Parasaurolophus tubicen (Wiman, 1931) > Parasaurolophus cyrtoccristatus (Ostrom, 1961)
Disarticulated associated skull and postcrania, pertaining to at least 3 individuals.
Sullivan & Williamson (1999)
PMU.RI 250. incomplete skull and narial crest
A long-crested Parasaurolophus that differs from P. walkeri and the short-crested P. cyrtocristatus in having an internally more complex narial crest consisting of a pair of dorsal tubes that extend from the external naris and terminate posteriorly. forming the apex of the narial crest below two pairs of tubes that extend from behind the external narial openings (and presumably are contiguous with them) forming a U-bend posteriorly where they coalesce into a single pair of ventral tubes and return anteriorly. forming the ventral margin of the narial crest where they rise slightly above the nasal and frontal region and fuse with the ventral tubes of the lateral diverticulae above before entering the choana; lateral divertculae are paired. arise anteriorly (presumably communicate with the external nares). extend posteriorly forming a tight U-bend and return ventrally above the ventral tubes and coalesce with the ventral tubes anteriorly before entering the choana. Dorsal and dorsolateral exterior surface of the narial crest bearing anastomosing furrows. Differs from P. cyrtocristatus in having a long narial crest.