page_title: Thalassodromeus
section_title: History of discovery
hierarchical_section_title: Thalassodromeus / History of discovery
caption_attribution_description: English: A reconstruction of the skull of the pterosaur Thalassodromeus sethi by John Conway [1], based on diagram in Kellner &amp; Campos, 2002.
context_page_description: Thalassodromeus is a genus of pterosaur that lived in what is now Brazil during the Early Cretaceous period, about 100 million years ago. The original skull, discovered in 1983 in the Araripe Basin of northeastern Brazil, was collected in several pieces. In 2002, the skull was made the holotype specimen of Thalassodromeus sethi by palaeontologists Alexander Kellner and Diogenes de Almeida Campos. The generic name means "sea runner", and the specific name refers to the Egyptian god Seth due to its crest being supposedly reminiscent of Seth's crown. Other scholars have pointed out that the crest was instead similar to the crown of Amon. A jaw tip was assigned to T. sethi in 2005, became the basis of the new genus Banguela in 2014, and assigned back to Thalassodromeus as the species T. oberlii in 2018. Another species was named in 2015 based on a supposed crest fragment, but this was later shown to be part of a turtle shell.
  Thalassodromeus had one of the largest known skulls among pterosaurs, around 1.42 m long, with one of the proportionally largest cranial crests of any vertebrate. Though only the skull is known, the animal is estimated to have had a wing span of 4.2 to 4.5 m.
context_section_description: The first known specimen of this pterosaur (an extinct order of flying reptiles) was collected in 1983 near the town of Santana do Cariri in the Araripe Basin of northeastern Brazil. Found in outcrops of the Romualdo Formation, it was collected over a long period of time in several pieces. The specimen (catalogued as DGM 1476-R at the Museu de Ciências da Terra) was preserved in a calcareous nodule, and consists of an almost-complete, three-dimensional skull (pterosaur bones are often flattened compression fossils), missing two segments of the bottom of the skull and mandible and the front of the lower jaw. The left jugal region and right mandibular ramus (half of the mandible) are pushed slightly inward. The skull was first reported in a 1984 Italian book, and preliminarily described and figured in 1990 by palaeontologists Alexander W. A. Kellner and Diogenes de Almeida Campos. Although the pieces of skull had been divided between museums in South and North America, they were assembled before 2002.
  In 2002, Kellner and Campos described and named the new genus and species Thalassodromeus sethi, skull DGM 1476-R being the holotype specimen. The generic name is derived from the Ancient Greek words θάλασσα (thálassa, "sea") and δρομεύς (dromeús, "runner"), meaning "sea runner" in reference to the animal's supposed skim-feeding behaviour. The specific name refers to the ancient Egyptian god Seth. The specimen was not fully prepared at the time of this preliminary description. The original describers chose the name sethi because the crest of this pterosaur was supposedly reminiscent of the crown worn by Seth; however, the palaeontologists André Jacques Veldmeijer, Marco Signore, and Hanneke J. M. Meijer pointed out in 2005 that the crown (with its two tall plumes) was typically worn by the god Amon (or Amon-Ra) and his manifestations – not by Seth.
  In 2006, palaeontologists David M. Martill and Darren Naish suggested that Thalassodromeus was a junior synonym of the related genus Tupuxuara, which was named by Kellner and Campos in 1988 based on fossils from the same formation. In the view of Martill and Naish, the differences between these genera (including two species of Tupuxuara, T. longicristatus and T. leonardii) were due to ontogeny (changes during growth) and compression of the fossils; Thalassodromeus was simply an older, larger, and better-preserved individual. This idea was rejected by Kellner and Campos in 2007, who pointed out these species had differences in features other than their crests. They also noted that one specimen of Tupuxuara had a larger skull than Thalassodromeus (measured from the tip of the premaxilla to the back of the squamosal bone), despite Martill and Naish's contention that the latter was an older individual. Kellner and Campos' view has since been accepted by other researchers, including Martill and Naish.
  Veldmeijer and colleagues assigned the front part of a mandible collected from the same formation to T. sethi in 2005. They concluded that although the two specimens differed in several details, the differences were not significant enough to base a new species on the mandible, and that the new specimen filled in the gap of Kellner and Campos' T. sethi skull reconstruction. Palaeontologists Jaime A. Headden and Herbert B. N. Campos coined the new binomial Banguela oberlii, based on their reinterpretation of the jaw tip as belonging to a toothless member of the family Dsungaripteridae, in 2014. The generic name is Portuguese for "toothless" and the specific name honours private collector Urs Oberli, who had donated the specimen to the Naturmuseum St. Gallen (where it is catalogued as NMSG SAO 25109). Headden and Campos interpreted the tip of T. sethi's lower jaw as downturned; this and other features distinguished it from Banguela. In their 2018 re-description of the further-prepared T. sethi holotype skull, palaeontologists Rodrigo V. Pêgas, Fabiana R. Costa, and Kellner assigned B. oberlii back to Thalassodromeus while recognising it as a distinct species, and thereby created the new combi
caption: Diagram of the T. sethi holotype skull (hatched lines represent missing parts), based on its initial interpretation
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