Coloborhynchus

of the C. clavirostris holotype Like many ornithocheiroid pterosaurs named during the 19th century, Coloborhynchus has a highly convoluted history of classification. Over the years numerous species have been assigned to it, and often, species have been shuffled between Coloborhynchus and related genera by various researchers. In 1874 Richard Owen, rejecting the creation by Harry Govier Seeley of the genus Ornithocheirus, named a species Coloborhynchus clavirostris based on holotype BMNH 1822, a partial snout from the Hastings Beds of the Wealden Group of East Sussex, England. The genus name means "maimed beak", a reference to the damaged and eroded condition of the fossil; the specific name means "key snout", referring to its form in cross-section. Owen also reclassified Ornithocheirus cuvieri and O. sedgwickii as species within the genus Coloborhycnhus, though he did not designate any of these three as the type species. Owen considered the defining trait of the genus to be the location of the front tooth pairs high on the side of the upper jaws. However, in 1913 Reginald Walter Hooley concluded that this location was an artefact of the erosion and that the genus was indistinguishable from Criorhynchus simus, the second genus and species Owen erected in 1874. Hooley also ignored Owen's reassignment of the two former Ornithocheirus species, leaving them in that genus. In 1967, Kuhn agreed with Hooley that Coloborhynchus clavirostris was a synonym of Criorhynchus simus. Furthermore, Kuhn was the first to formally designate C. clavirostris as the type species of the genus, rather than one of the Ornithocheirus species. Most later researchers followed these opinions, regarding Coloborhynchus as invalid relative to Criorhynchus. This changed in 1994 when Yuong-Nam Lee named Coloborhynchus wadleighi for a snout found in 1992 in the Albian age Paw Paw Formation Texas. The revival of the genus meant that of several related species, then assigned to other genera, had to be re-evaluated to determine whether or not they actually belonged to Coloborhynchus. In 2008, Taissa Rodrigues and Alexander Kellner re-formulated the key features of Coloborhynchus, again based mainly on the unique positions of the tooth sockets. Rodrigues and Kellner argued that Lee's C. wadleighi, which possessed some differences in the skull and teeth from C. clavirostris, and from an earlier time period, belonged in its own genus, which they named Uktenadactylus. However, a 2023 review of Kem Kem pterosaurs found the traits that distinguish Nicorhynchus from Coloborhynchus to be subtle enough to justify their synonymy, stating that the material was damaged and fragmentary enough to support this. List of species and synonyms Species which have been assigned to Coloborhynchus by various scientists over the years include: • C. clavirostris Owen, 1874, the type species • ?C. ligabuei (Dalla Vecchia, 1993) = Cearadactylus ligabuei Dalla Vecchia, 1993 [also classified as Anhanguera ligabuei] • ?C. piscator • ?C. robustus (Wellnhofer, 1987) = Tropeognathus robustus Wellnhofer, 1987 [now seen as a nomen dubium] • C. wadleighi Lee, 1994 [also classified as Uktenadactylus] • C. moroccensis (Mader & Kellner, 1999) = Siroccopteryx moroccensis Mader & Kellner 1999 • C. piscator Veldmeijer, 2003 [now classified as Maaradactylus] • C. capito (Seeley, 1870) = Ornithocheirus capito Seeley, 1870 = "Ptenodactylus capito" Seeley, 1869 [now classified as Nicorhynchus] • C. fluviferox Jacobs, Martill, Ibrahim & Longrich, 2018 [now classified as Nicorhynchus] ==Description==

of the possible species C. fluviferox The type specimen of Coloborhynchus is known only from a partial upper jaw. Therefore, according to Rodrigues and Kellner's 2008 re-evaluation on Coloborhynchus clavirostris, it can only be differentiated from its relatives based on its unique combination of tooth socket positions. In Coloborhynchus, the two front teeth pointed forward and were higher on the jaw than the other teeth, while the next three pairs of teeth pointed to the sides. The final two (preserved) pairs of teeth pointed downward. Finally, a unique oval depression was located below the first pair of teeth. Like the related Anhanguera and Uktenadactylus, the tip of the snout flared out into a wider rosette, in contrast to the narrow posterior jaws. However, whereas the rosettes of species typically assigned to Anhanguera were rounded and spoon-shaped, those of Coloborhynchus were robust and box-shaped. and indeed the largest toothed pterosaur known. A referred specimen from the Cambridge Greensand of England described in 2011 consists of a very large upper jaw tip which displays the tooth characteristics that distinguish C. capito from other species. The jaw tip is nearly 10 cm tall and 5.6 cm wide, with teeth up to 1.3 cm in base diameter. If the proportions of this specimen were consistent with other known species of Coloborhynchus, the total skull length could have been up to 75 cm, leading to an estimated wingspan of . However, this species may belong to a different genus. ==Classification==

A topology made by Andres and Myers in 2013 placed the species Coloborhynchus clavirostris and C. wadleighi (now generally considered as Uktenadactylus) within the family Ornithocheiridae as sister taxa to Ornithocheirus simus, and the family itself is placed within the more inclusive clade Ornithocheirae. Later, in 2019, Pentland et al. recovered a similar result to the one by Andres and Myers in 2013 where Coloborhynchus is the sister taxon of Ornithocheirus. Their cladogram is shown on the left. In 2018, Jacobs et al. also recovered a similar cladogram compared to Andres and Myers (2013), where both Coloborhynchus and Siroccopteryx were assigned to the Ornithocheiridae, however, unlike the study made by Andres and Myers, they used the name Uktenadactylus wadleighi to refer to C. wadleighi in their analysis. They published their conclusion in 2019. The cladogram on the left shows a phylogenetic analysis made by Borja Holgado and Rubi Pêgas in 2020. Topology 1: Pentland et al. (2019). }} }} }} }} }} }} }} }} Topology 2: Holgado & Pêgas (2020). }} }} }} }} }} }} }} }} }} }} }} ==Paleobiology==

Similar to most anhanguerids, Coloborhynchus is traditionally thought to be an oceanic piscivore. However one study found it among the carnivorous pterosaur taxa, as opposed to several other piscivore and insectivore species. ==See also==