Coloborhynchus

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Coloborhynchus
Temporal range:
Ma
↓
Holotype jaw fragment of C. clavirostris in multiple views
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Order: †Pterosauria
Suborder: †Pterodactyloidea
Clade: †Ornithocheirae
Genus: †Coloborhynchus
Owen, 1874
Type species
†Coloborhynchus clavirostris
Owen, 1874
Other species
Synonyms
List of synonyms
  • Genus synonymy
    Synonyms of C. capito
    Synonyms of C. fluviferox
      • Nicorhynchus fluviferox
        (Jacobs et al., 2019)

Coloborhynchus is a

Lower Cretaceous of England (Valanginian age, 140 to 136 million years ago),[1] 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,[2] however, a specimen of the closely related Tropeognathus is now thought to have had a larger wingspan.[3]

History and classification

Lithograph
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

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.[4][5]

This changed in 1994 when

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.[4]

A partial lower jaw originally named

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.[4]

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.[4]

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).[4]

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.

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.[7] 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.[8]

List of species and synonyms

Holotype and referred specimen of the possible species C. capito

Species which have been assigned to Coloborhynchus by various scientists over the years include:

Description

1914 illustration of the C. clavirostris holotype with dotted lines reconstructing worn away jaw margin

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.[4]

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.[6]

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.[4]

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.[4]

Life restoration
of the possible species C. fluviferox

The possible species Coloborhynchus capito represents the second largest known ornithocheirid (after a Tropeognathus specimen),[3] 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 7 metres (23 ft).[11] However, this species may belong to a different genus.[1]

A rostrum fragment diagnostic to Coloborhynchus sp. is known from the Wessex Formation of England.[12]

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.[13] 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.[14] 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.[6] However, many subsequent analyses made in 2019 and 2020 have recovered Coloborhynchus within the family Anhangueridae, more specifically within the subfamily Coloborhynchinae.[15][16][17] The cladogram on the left shows a phylogenetic analysis made by Borja Holgado and Rodrigo Pêgas in 2020.[7]

C. clavirostris holotype with interpretative line drawings

Paleobiology

Similar to most anhanguerids, Coloborhynchus is traditionally thought to be an oceanic piscivore.[18] However one study found it among the carnivorous pterosaur taxa, as opposed to several other piscivore and insectivore species.[19]

See also

References

  1. ^
    PMID 23794925
    .
  2. ^ Davies, Ella (4 October 2011). "'Ugly' fossil is largest toothed pterosaur". BBC Nature. Archived from the original on 6 October 2011.
  3. ^
    PMID 23538956
    .
  4. ^ a b c d e f g h Rodrigues, Taiss; Kellner, Alexander W. A. (2008). "Review of the pterodactyloid pterosaur Coloborhynchus" (PDF). Zitteliana. 28: 219–228.
  5. doi:10.1080/00222931408693521
    .
  6. ^
    S2CID 134439172
    .
  7. ^
    doi:10.4202/app.00751.2020
    .
  8. ISSN 1867-6812
    .
  9. ^ a b c d Veldmeijer, A. J. (2002). "Description of Coloborhynchus spielbergi sp. nov. (Pterodactyloidea) from the Albian (Lower Cretaceous) of Brazil". Scripta Geology. 125 (3003): 35–139.
  10. PMID 28484676
    .
  11. doi:10.1016/j.cretres.2011.09.003
    .
  12. doi:10.1016/j.pgeola.2015.03.004
    .
  13. S2CID 84617119
    .
  14. ^
    PMID 31582757
    .
  15. doi:10.1038/s41598-019-41280-4
  16. PMID 31784545
    .
  17. S2CID 209595986
    .
  18. doi:10.1130/abs/2017AM-305496
    .
  19. PMID 33116130
    .

The Pterosaur Database (multiple species, scroll down)

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