Jump to content

Baptanodon

From Wikipedia, the free encyclopedia

Baptanodon
Temporal range:Late Jurassic,160–156Ma
HolotypeskullofB. natans
Scientific classificationEdit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Ichthyosauria
Family: Ophthalmosauridae
Subfamily: Ophthalmosaurinae
Genus: Baptanodon
Marsh,1880
Type species
Baptanodon natans
Marsh, 1880
Synonyms
  • OphthalmosaurusnatansMarsh, 1879
  • SauranodonMarsh, 1879 (preoccupied)
  • MicrodontosaurusGilmore, 1902

Baptanodonis anichthyosaurof theLate Jurassicperiod (160-156 million years ago), named for its supposed lack of teeth (although teeth of this genus have since been discovered).[1]It had a graceful 3.5 m (11 ft) long dolphin-shaped body, and its jaws were well adapted for catching squid.[2]Major fossil finds of this genus have been recorded inNorth America.The type species,Sauranodon natans,was originally included underSauranodonin 1879,[3]but this name was preoccupied.

Discovery and species

[edit]

Baptanodonis a replacement name forSauranodonapplied to ichthyosaur material in 1879[3]and was moved to its own genusBaptanodonin 1880 whenSauranodonwas found to be preoccupied.[4] Baptanodonwas considered ajunior synonymofOphthalmosaurusby Maisch & Matzke (2000).[5]However, cladistic analyses published in the 2010s indicate thatBaptanodonis not congeneric withOphthalmosaurus icenicus.[6][7][8]

Classification

[edit]

The cladogram below follows Fischeret al.2012.[7]

Thunnosauria

Palaeobiology

[edit]

Fossils ofBaptanodonhave been found in the Oxfordian-ageSundance Formationof Wyoming, which also has yielded fossils of the cryptoclididsTatenectesandPantosaurus,and the pliosauridMegalneusaurus.[4][10]

See also

[edit]

References

[edit]
  1. ^Gilmore, C. W. (1902)."Discovery of teeth inBaptanodon,an ichthyosaurian from the Jurassic of Wyoming ".Science.16(414): 913–914.Bibcode:1902Sci....16..913G.doi:10.1126/science.16.414.913.PMID17756122.
  2. ^Massare, J.A.; Wahl, W.R.; Ross, M.; Connely, M.V. (2014). "Palaeoecology of the marine reptiles of the Redwater Shale Member of the Sundance Formation (Jurassic) of central Wyoming, USA".Geological Magazine.151(1): 167–182.doi:10.1017/S0016756813000472.
  3. ^abO. C. Marsh. 1879. A new order of extinct reptiles (Sauranodonta), from the Jurassic Formation of the Rocky Mountains.The American Journal of Science and Arts, series 3
  4. ^abMarsh, O. C., 1880, Note on Sauranodon:American Journal of Science, 3rd series,v. 19, n. 4, p. 491.
  5. ^Maisch MW, Matzke AT. 2000. The Ichthyosauria.Stuttgarter Beiträge zur Naturkunde, Serie B (Geologie und Paläontologie)298:1-159.
  6. ^Patrick S. Druckenmiller; Erin E. Maxwell (2010). "A new Lower Cretaceous (lower Albian) ichthyosaur genus from the Clearwater Formation, Alberta, Canada".Canadian Journal of Earth Sciences.47(8): 1037–1053.Bibcode:2010CaJES..47.1037D.doi:10.1139/E10-028.
  7. ^abValentin Fischer; et al. (2012)."New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary".PLOS ONE.7(1): e29234.Bibcode:2012PLoSO...729234F.doi:10.1371/journal.pone.0029234.PMC3250416.PMID22235274.
  8. ^Ilaria Paparella; Erin E. Maxwell; Angelo Cipriani; Scilla Roncacè; Michael W. Caldwell (2017). "The first ophthalmosaurid ichthyosaur from the Upper Jurassic of the Umbrian–Marchean Apennines (Marche, Central Italy)".Geological Magazine.154 (4): 837–858. doi:10.1017/S0016756816000455.
  9. ^Arkhangel’sky, M. S., 1998, On the Ichthyosaurian Genus Platypterygius: Palaeontological Journal, v. 32, n. 6, p. 611-615.
  10. ^Marsh, O. C., 1895, The Reptilia of the Baptanodon Beds: AmericanJournal of Science, 3rd series,v. 34., n. 299, p. 405-406.