Pontogeneus
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| "P. brachyspondylus" vertebra, Florida Museum of Natural History | |
| Scientific classification Edit this classification | |
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| Binomial name | |
| Template:Taxon infoTemplate:Taxon italics Leidy, 1852
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| Synonyms | |
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Pontogeneus (nomen dubium)[1] is a genus of extinct cetacean known from fossils recovered from the Late Eocene sediments (Bartonian-Priabonian stages) of the southeastern United States (most notably Alabama and Florida).
Classification
When "Zeuglodon" brachyspondylus was formerly included, Pontogeneus was depicted as having a skeleton similar to that of Basilosaurus cetoides, although the posterior thoracic vertebrae, the lumbar vertebrae, and the anterior caudal vertebrae had proportions closer to those seen in members of the archaeocete Subfamily Dorudontinae.
Taxonomic history
In 1852, Joseph Leidy had erected Pontogeneus priscus based on the centrum of a single cervical vertebra in the collections of the Academy of Natural Sciences in Philadelphia. Leidy noted that the centrum had been collected from exposures along the Washita River in Louisiana. Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. synonymized these two taxa to form Pontogeneus brachyspondylus which he listed as incertae sedis.[2]
Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. designated Pontogeneus priscus and Zeuglodon brachyspondylus to be nomina dubia based on the lack of diagnostic characters that distinguish the type specimens from other basilosaurids. While Pontogeneus priscus is no longer considered valid, "Z." brachyspondylus appears similar to Masracetus from Egypt (which was also referred to Z. brachyspondylus in the past) and may represent either a species of Masracetus or a distinct and closely related but as-yet-unnamed genus.[3]
Formerly assigned to Pontogeneus
"Zeuglodon brachyspondylus" (Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.) was erected for several vertebrae collected in either Choctaw or Washington counties in southern Alabama.
Basilosaurid remains from Egypt were tentatively assigned to Zeuglodon brachyspondylus based on superficial similarities to the syntype series (under the old hypothesis of synonymy of Pontogeneus and Zeuglodon brachyspondylus).[4] However, these remains were given their own genus, Masracetus, given minor differences from "Z." brachyspondylus.[3]
Notes
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- ^ Template:Paleodb. Retrieved April 2013.
- ^ Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
- ^ a b Gingerich, Philip D (2007). "Stromerius nidensis, new archaeocete (Mammalia, Cetacea) from the Upper Eocene Qasr El-Sagha Formation, Fayum, Egypt". Contributions from the Museum of Paleontology 31 (13): 363–78. OCLC 214233870.
- ^ Stromer, Ernst, 1908. Die Archaeoceti des ägyptischen Eozäns. Beiträge zur Paläontologie und Geologie Österreich-Ungarns und des Orients, Vienna, 21: 106-178.
References
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- Page Module:Citation/CS1/styles.css has no content.Jones, D. E. (1989). "Doctor Koch and his "Immense Antediluvian Monsters"". Alabama Heritage. 12: 2–19. Archived from the original on 23 August 2012. Retrieved 1 April 2013.
- Page Module:Citation/CS1/styles.css has no content.Kellogg, R. (1936). A review of the Archaeoceti (PDF, 46 Mb). Washington: Carnegie Institution of Washington. OCLC 681376. Retrieved 1 July 2013.
- Page Module:Citation/CS1/styles.css has no content.Müller, J. P. (1849). Über die fossilen Reste der Zeuglodonten von Nordamerika mit Rücksicht auf die europäischen Reste aus dieser Familie. Berlin: Reiner. pp. 1–38. OCLC 422134028.
- Page Module:Citation/CS1/styles.css has no content.Thewissen, J.G.M., ed. (1998). The Emergence of Whales: Evolutionary Patterns in the Cetacea. Plenum Press. ISBN 9780306458538.
- Page Module:Citation/CS1/styles.css has no content.Thurmond, J.T.; Jones, D.E. (1981). Fossil Vertebrates of Alabama. University of Alabama Press. OCLC 6144344.
- Page Module:Citation/CS1/styles.css has no content.Uhen, M. D. (2005). "A new genus and species of archaeocete whale from Mississippi". Mississippi Geology. 43 (3): 157–172.
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