Coloborhynchus Fluviferox By Nick Longrich

''Coloborhynchus'' is a genus of pterodactyloid pterosaur belonging to the family Anhangueridae, though it has also been recovered as a member of the Ornithocheiridae in some studies. ''Coloborhynchus'' is known from the Lower Cretaceous of England (Valanginian age, 140 to 136 million years ago), and depending on which species are included, possibly the Albian and Cenomanian ages (113 to 93.9 million years ago) as well. ''Coloborhynchus'' was once thought to be the largest known toothed pterosaur, however, a specimen of the closely related ''Tropeognathus'' is now thought to have had a larger wingspan.

History and classification

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''.

A partial lower jaw originally named ''Tropeognathus robustus'' from the Romualdo Member of the Santana Formation in Brazil was assigned to ''Coloborhynchus'' in 2001 by Fastnacht, as ''Coloborhynchus robustus''. In 2002, David Unwin supported this position, and also synonymized the more well-known species ''Anhanguera piscator'' with ''C. robustus''. Rodrigues and Kellner disagreed with this classification, however, noting that both did not possess the unique straightened crest beginning at the snout tip, or sideways pointed teeth, of ''C. clavirostris''. Instead, Rodrigues and Kellner regarded both ''Anhanguera robustus'' and ''Anhanguera piscator'' as valid species of ''Anhanguera''.

Another Brazilian species from the Romualdo Member was named ''Coloborhynchus spielbergi'' by Veldmeijer in 2003. It shares one or two characters in common with ''C. clavirostris'' (such as a flattened upper surface of the snout), though Rodrigues and Kellner regarded them as dubious, and noted that they are also present in other genera. Kellner recombined it as ''Anhanguera spielbergi'' in 2006. Similarly, Kellner excluded '' C. araripensis'' (formerly assigned to the genus ''Santanadactylus'' from the genus, based on lack of comparable diagnostic features. Unwin, in 2001, assigned the species '' Siroccopteryx moroccensis'' to ''Coloborhynchus'', based on its similarity to ''C. wadleighi'' (type species of ''Uktenadactylus''). Kellner, who regarded ''Uktenadactylus'' as a distinct genus in 2008, also regarded ''Siroccopteryx'' as distinct, and noted that like the other species assigned to ''Coloborhynchus'', lacked its unique characteristics of the tooth row, a position also supported by Fastnacht in 2001.

In 2001, Unwin also reassigned the two other species from the Cambridge Greensand to ''Coloborhynchus'': ''C. capito'' and ''C. sedgwickii'', the second of which being one of the original members of the genus according to Richard Owen in 1874. According to Kellner, ''C. capito'' is too incomplete to fully compare to ''C. clavirostris'', and its precise classification is open to debate. He noted that ''C. sedgwicki'' does not possess the unique features of ''C. clavirostris'' (in fact it lacks a crest altogether), and may instead belong to the same genus as "''Ornithocheirus''" ''compressirostris'' (=''Lonchodectes'').

In 2013, Rodrigues and Kellner considered ''Coloborhynchus'' to be monotypic, containing only ''C. clavirostris'', and placed most other species in other genera, or declared them ''nomina dubia''. In 2018, Jacobs ''et al.'' named a new species of ''Coloborhynchus'', ''C. fluviferox'' from the Ifezouane Formation of the Kem Kem Group of Morocco based on a partial snout, and also tentatively referred another specimen from the same locality to a different, unnamed species. A 2020 review of Coloborhynchinae by Holgado and Pêgas moved both ''C. capito'' and ''C. fluviferox'' to a new genus, ''Nicorhynchus'', and also referred the unnamed Ifezouane Formation coloborhynchine to ''N. fluviferox''.

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 lso classified as ''Anhanguera ligabuei''/small>
*?'' C. piscator'' (Kellner & Tomida, 2000) = ''Anhanguera piscator'' Kellner & Tomida, 2000 lso classified as ''Anhanguera'' or ''C. robustus''/small>
Species assigned to ''Coloborhynchus'' in the past include:
*''C. cuvieri'' (Bowerbank, 1851) = ''Ornithocheirus sedgwicki'' (Newton, 1888) = ''Pterodactylus cuvieri'' Bowerbank, 1851 ow classified as ''Cimoliopterus''">Cimoliopterus.html" ;"title="ow classified as ''Cimoliopterus">ow classified as ''Cimoliopterus''/small>
*''C. sedgwicki'' (Owen 1859) = ''Ornithocheirus sedgwicki'' (Newton, 1888) = ''Pterodactylus sedgwickii'' Owen, 1859 [now classified as ''Camposipterus'']
*'' C. araripensis'' (Wellnhofer, 1985) = ''Santanadactylus araripensis'' Wellnhofer, 1985 now seen as a ''nomen dubium''
*?'' C. robustus'' (Wellnhofer, 1987) = ''Tropeognathus robustus'' Wellnhofer, 1987 ow seen as a ''nomen dubium''/small>
*'' C. wadleighi'' Lee, 1994 [also classified as ''Uktenadactylus'']
*''C. moroccensis'' (Mader & Kellner, 1999) = '' Siroccopteryx moroccensis'' Mader & Kellner 1999
*'' C. piscator'' (Kellner & Tomida, 2000) = ''Anhanguera piscator'' Kellner & Tomida, 2000
*'' C. spielbergi'' Veldmeijer, 2003 ow classified as ''Maaradactylus''">Maaradactylus.html" ;"title="ow classified as ''Maaradactylus">ow classified as ''Maaradactylus''/small>
*''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

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.

Also like its close relatives, ''Coloborhynchus'' had a keel-shaped crest on the front of its jaws, though it was broad and thinned from base to top, rather than the uniformly thin crests of its relatives. This kind of thickened crest is also seen in '' Siroccopteryx moroccensis'', which may be its closest relative or a member of the same genus. It also had a straight, rather than curved, front margin, unlike its relatives, and begins at the tip of the snout, rather than further back as in other species.

A second specimen showing all of these same unique features was reported to Brazilian paleontologist Alexander Kellner by Darren Naish in 2007, and likely represents a second specimen of ''C. clavirostris'', though it has not yet been described.

The possible species ''Coloborhynchus capito'' represents the second largest known ornithocheirid (after a ''Tropeognathus'' specimen), 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.

A rostrum fragment diagnostic to ''Coloborhynchus'' sp. is known from the Wessex Formation of England.

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. However, many subsequent analyses made in 2019 and 2020 have recovered ''Coloborhynchus'' within the family Anhangueridae, more specifically within the subfamily Coloborhynchinae.Borja Holgado, Rodrigo V. Pêgas, José Ignacio Canudo, Josep Fortuny, Taissa Rodrigues, Julio Company & Alexander W.A. Kellner, 2019, "On a new crested pterodactyloid from the Early Cretaceous of the Iberian Peninsula and the radiation of the clade Anhangueria", ''Scientific Reports'' 9: 4940 The cladogram on the left shows a phylogenetic analysis made by Borja Holgado and Rodrigo 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

* List of pterosaur genera
* Timeline of pterosaur research

References

The Pterosaur Database (multiple species, scroll down)

{{Portal bar, Paleontology, Cretaceous, United Kingdom

Pteranodontoids
Early Cretaceous pterosaurs of Europe
Taxa named by Richard Owen
Fossil taxa described in 1874