Macroscelosaurus
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Tanystropheus Temporal range: Middle Triassic, 245–228 Ma |
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| Restored T. longobardicus skeleton | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | †Protorosauria |
| Family: | †Tanystropheidae |
| Genus: | †Tanystropheus |
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Tanystropheus (Greek τανυς “long” + στροφαηυς “vertebra”), was a 6 metre (20 ft) long reptile that dated from the Middle Triassic period. It is recognizable by its extremely elongated neck, which measured 3 metres (10 ft) long - longer than its body and tail combined. The neck was composed of 12–13 extremely elongate vertebrae Fossils have been found in Europe, the Middle East and China. Complete skeletons of juvenile individuals are most abundant in the Besano Formation of Italy, dating to 232 million years ago during the middle Triassic period (Ladinian stage).
Tribelesodon, originally considered to be a pterosaur by Francesco Bassani in 1886, is now recognized as a junior synonym to Tanystropheus. The best-known species is Tanystropheus longobardicus. Other currently recognized species include T. conspicuus and T. meridensis. Another junior synonym of Tanystropheus is Procerosaurus. Two specimens were initially identified as Procerosaurus: The first was described as P. cruralis by von Huene in 1902. The second was described by Antonín Jan Frič in 1878 as a species of Iguanodon (Iguanodon exogirarum, later amended to exogyrarum), and is a highly doubtful dinosaurian-like bit of bone (possibly an internal cast of a tibia) from the Cenomanian (Late Cretaceous) of the Czech Republic. He reassigned the species to Procerosaurus in 1905 intending to erect it as a new genus, unaware that the genus name was already in use. George Olshevsky in 2000 substituted Ponerosteus for this species.
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