Arambourgia Explained

Arambourgia is an extinct monotypic genus of alligatorine crocodylian from Europe. It was named in 1905 as Allognathosuchus gaudryi. It was made a separate genus Arambourgia in 1940. This was synonymized with Allognathosuchus haupti in 1990^[1] (now known as Hassiacosuchus haupti), but later reassigned as its own genus once again in 2004.^[2] Arambourgia was likely to have been part of an early dispersal event of alligatorines from North America to Europe during the Eocene epoch. Arambourgia had non-serrated teeth and a deep orienirostral snout, unlike the flatter snouts of most other alligatorids.

Recent studies have consistently resolved Arambourgia as a member of Alligatorinae, although its relative placement is disputed, as shown by the cladograms below.^{[3] [4] [5]}

Cladogram from 2018 Bona et al. study:^[3]

Cladogram from 2019 Massonne et al. study:^[4]

Cladogram from 2020 Cossette & Brochu study:^[5]

Notes and References

1. Rauhe . M. . 1990 . Habit-Habitus-Wechselbeziehung von Allognathosuchus gaudryi Stefano 1905 (=Allognathosuchus haupti Weitzel 1935) . Geologisches Jahrbuch Hessen . 118 . 53–61 .
2. 10.1671/0272-4634(2004)024[0857:APATSO]2.0.CO;2 . Brochu . Christopher A. . 2004 . Alligatorine phylogeny and the status of Allognathosuchus Mook, 1921 . . 24 . 4. 857–873 . 85050852 .
3. Paula Bona . Martín D. Ezcurra . Francisco Barrios . María V. Fernandez Blanco . 2018 . A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines . Proceedings of the Royal Society B: Biological Sciences . 285 . 1885 . 20180843 . 10.1098/rspb.2018.0843 . 30135152 . 6125902 .
4. Tobias Massonne . Davit Vasilyan . Márton Rabi . Madelaine Böhme . 2019 . A new alligatoroid from the Eocene of Vietnam highlights an extinct Asian clade independent from extant Alligator sinensis . PeerJ . 7 . e7562 . 10.7717/peerj.7562 . 31720094 . 6839522 . free .
5. Adam P. Cossette . Christopher A. Brochu . 2020 . A systematic review of the giant alligatoroid Deinosuchus from the Campanian of North America and its implications for the relationships at the root of Crocodylia . Journal of Vertebrate Paleontology . 40 . 1 . e1767638 . 10.1080/02724634.2020.1767638 . 2020JVPal..40E7638C . free .