Janenschia

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Janenschia
Temporal range: 155–145 
Ma
 Late Jurassic
Janenschia
Museum für Naturkunde
, Berlin
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: †Sauropodomorpha
Clade: †Sauropoda
Clade: †Neosauropoda
Clade: †Macronaria
Genus: †Janenschia
Wild, 1991
Species:
†J. robusta
Binomial name
†Janenschia robusta
(Fraas, 1908)

Janenschia (named after

sauropod dinosaur from the Late Jurassic Tendaguru Formation of Lindi Region, Tanzania
around 155 million years ago.

Alternate view

Discovery and naming

Janenschia has had a convoluted nomenclatural history. In 1907,

Harry Govier Seeley in 1869. Fraas thought his actions could be justified by the fact that the description by Seeley had been limited and that the material of G. megalonyx had since been referred to another genus, Ornithopsis, by Richard Lydekker.[2][3][4][5][6]

In 1911,

Sidney Henry Haughton exceptionally assigned Tornieria robusta to Barosaurus also, as a Barosaurus robustus.[9]

In 1930, Baron

Franz Nopcsa rejected Janensch's arguments. He admitted that Sternfeld had been discourteous but pointed out that the ICZN only in 1927 recommended that the original author should be involved in such name changes. It would thus be absurd to object to an article written in 1911 — and in any case the lack of courtesy had no bearing on the validity of the name. Nopcsa had found several later mentions of G. megalonyx, which thus had not been a nomen oblitum. Furthermore, Gigantosaurus robustus had prior to 1922 not exactly been a well-known name itself. Distasteful as it might be, Nopcsa concluded, it was inevitable to consider Tornieria to be a valid name.[10] SMNS 12144 was subsequently referred to Tornieria by other authors.[11][12][13][14]

In 1991, German palaeontologist

Titanosauridae, making it the oldest member of Titanosauria.[15]

A number of specimens formerly assigned to Janenschia have been recognized as distinct genera. Two anterior dorsal vertebrae, and a possible posterior cervical vertebra, previously referred to the genus, were named Tendaguria in 2000.[16] On the other hand, the caudal vertebral series MB.R.2091.1–30 does not overlap with SMNS 12144 and instead represents the first taxon of Mamenchisauridae from outside Asia, Wamweracaudia.[17][18] Recent cladistic analysis places Janenschia as a non-titanosauriform sauropod.[19][18]

References

Wikimedia Commons has media related to Janenschia.
  1. ^ Fraas, E. (1908) "Dinosaurierfunde in Ostafrika", Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg 64: 84–86
  2. ^ E. Fraas. 1908. "Ostafrikanische Dinosaurier". Mitteilungen aus dem Königlichen Naturalien-Kabinett zu Stuttgart 55(61): 105-144
  3. ^ E. Fraas. 1908. "Dinosaurier in Deutsch-Ostafrika". Die Umschau 12(48): 943-948
  4. ^ E. Fraas. 1911. "Die ostafrikanischen Dinosaurier". Verhandlungen der Gesellschaft Deutscher Naturfoscher und Ärzte 83(1): 27-41
  5. ^ E. Fraas. 1912. "Die ostafrikanischen Dinosaurier". Sammlung Wissenschaftlicher Vorträge 1: 3-21
  6. ^ Lydekker, R. 1888. Catalogue of the Fossil Reptilia and Amphibia in the British Museum (Natural History). Part I. Containing the Orders Ornithosauria, Crocodilia, Dinosauria, Squamata, Rhynchocephalia, and Proterosauria. British Museum (Natural History), London, 309 pp
  7. ^ R. Sternfeld. 1911. "Zur Nomenklatur der Gattung Gigantosaurus Fraas [On the nomenclature of the genus Gigantosaurus Fraas]". Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 8: 398
  8. ^ Janensch, W., 1922, "Das Handskelett von Gigantosaurus robustus und Brachiosaurus brancai aus den Tendaguru-Schichten Deutsch-Ostafrikas", Centralblatt für Mineralogie, Geologie und Paläontologie 1922: 464–480
  9. doi:10.1080/00359192809519658
    .
  10. ^ Nopcsa, F. 1930. "Zur Systematik und Biologie der Sauropoden". Palaeobiologica, 3: 40-52
  11. ^ Stromer, E. (1932). "Ergebnisse der Forschungsreisen Prof. E. Stromers in den Wüsten Ägyptens. II. Wirbeltierreste der Baharîje-Stufe (unterstes Cenoman). 11. Sauropoda" [Results of the expeditions of Professor E. Stromer in the Egyptian deserts. II. Vertebrate animal remains from the Baharîje bed (lowest Cenomanian). 11. Sauropoda]. Abhandlungen der Bayerischen Akademie der Wissenschaften Mathematisch-naturwissenschaftliche Abteilung, Neue Folge 10:1–21
  12. ^ Steel, R. (1970). Part 14. Saurischia. Handbuch der Paläoherpetologie/Encyclopedia of Paleoherpetology. Gustav Fischer Verlag, Stuttgart pp. 1–87
  13. ^ Jain, S. L.; Kutty, T. S.; Roy-Chowdhury, T. K. and Chatterjee, S. (1979). "Some characteristics of Barapasaurus tagorei, a sauropod dinosaur from the Lower Jurassic of Deccan, India". In B. Laskar & C. S. Raja Rao (eds.), Fourth International Gondwana Symposium: Papers. Hindustan Publishing Corporation, Delhi 1:204–216
  14. ^ Buffetaut, E. (1989). Une vertèbre de Dinosaure Titanosauridé dans le Cénomanien du Mans et ses implications paléobiogéographiques [A titanosaurid dinosaur vertebra in the Cenomanian of Le Mans and its paleobiogeographic implications]. Comptes Rendus de l'Académie des Sciences de Paris, Série II 309:437–443
  15. ^ Wild, R. (1991). Janenschia n. g. robusta (E. Fraas 1908) pro Tornieria robusta (E. Fraas 1908) (Reptilia, Saurischia, Sauropodomorpha) [Janenschia n. g. robusta (E. Fraas 1908) for Tornieria robusta (E. Fraas 1908) (Reptilia, Saurischia, Sauropodomorpha)]. Stuttgarter Beiträge zur Naturkunde, Serie B (Geologie und Paläontologie) 173:1–4
  16. doi:10.1127/pala/256/2000/25.[permanent dead link
    ‍]
  17. doi:10.1111/zoj.12029
    .
  18. ^
    doi:10.1093/zoolinnean/zly068
    .
  19. PMID 26039587
    .
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