Ptilodus
| Ptilodus Temporal range:
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|---|---|
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| Skull of P. mediaevus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Multituberculata |
| Family: | †Ptilodontidae |
| Genus: | †Ptilodus Cope, 1881 |
| Species | |
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P. fractus | |
Ptilodus (meaning "soft-haired") is a genus of mammals from the extinct order of Multituberculata, and lived during the Paleocene in North America.
Ptilodus was a relatively large multituberculate of 30 to 50 centimetres (12 to 20 in) in length, which is about the same size as a squirrel. Its feet, legs and long tail suggest it was a good climber, so it very possibly led a squirrel-like lifestyle.[1]
The genus was named by
Species
There are seven species, and others have been proposed at one time or another. P. nellieae (Bell, 1941) is apparently mentioned in a manuscript, rather than a publication. P. sinclairi (Simpson, 1935) seems to have become Parectypodus sinclairi. In botany, Ptilodus pyramidatus is an extinct Australian plant.
P. fractus
The species Ptilodus fractus had a body weight of about 95 grams (3.4 oz). Remains have been found in
The species was named by J. A. Door in 1952 (Scott et al., 2002, Dorr, 1952), though it may have been amended to its current state by David Krause in 1987.
P. gnomus
Ptilodus gnomus is the smallest known member of the genus. Hence, the species epithet 'gnomus', which is Neo-Latin for 'dwarf'. Remains have been discovered in Wyoming in the United States, and Alberta, Canada. They were recovered from the Cochrane 2 deposits of the Paskapoo Formation, which have been dated to the Tiffanian stage of the Paleocene.
Remains of this species include over 100
- Although more similar in size to homologous teeth referable to P. tsosiensis and P. fractus, the upper and lower ultimate premolars of this new species most closely resemble those of P. mediaevus in overall morphology. (Scott et al., 2002)
A couple of isolated teeth which had been previously identified as perhaps belonging to Ectypodus, have been now been placed within this taxon. All referred specimens are held in the collection of the University of Alberta.
The species was named by C. R. Scott, R. C. Fox, and G. P. Youzwyshyn in 2002. Material assigned by Jepsen in 1940, as amended by Gazin in 1956, to Ectypodus hazeni has also been assigned to this species.
There are three species of this genus known from the Alberta location, two of which have yet to be described. This will be attended to by David W. Krause. (Scott et al., 2002, pg. 691).
P. kummae
Ptilodus kummae has an estimated weight of 120 grams (4.2 oz). Remains have been discovered in Roche Percee, Saskatchewan in Canada, in deposits from the lower Tiffanian stage of the Paleocene.
The species was named by David W. Krause in 1977. (Krause, 1977) The holotype is at Alberta University.
P. mediaevus
Remains of Ptilodus mediaevus have been recovered in New Mexico, Utah, and Wyoming in the United States. They have been unearthed from the deposits of the San Juan Basin, which are dated to the Torrejonian stage of the Paleocene.
Cope named the species in 1881 (
P. montanus
Ptilodus montanus is a large species, about 650 grams (23 oz). A brain cast indicates a well-developed sense of smell. Remains were recovered in Montana, in the rock of the Silberling Quarry, which is dated to the lower Tiffanian stage of the Paleocene.
The species was named by E. Douglass in 1908 (
P. tsosiensis
Ptilodus tsosiensis has been discovered in New Mexico, the Puercan stage deposits of the Lower Paleocene San Juan Basin. The species was named by R. E. Sloan in 1981 (Sloan, 1981).
P. wyomingensis
Remains of Ptilodus wyomingensis have been found in the Middle Paleocene deposits of the Rock Bench Quarry, in Wyoming and North Dakota in the United States. The species was named by G. L. Jepsen in 1940 (Jepsen, 1940).
See also
Media related to Ptilodus at Wikimedia Commons
References
- ISBN 1-84028-152-9.
- G. L. Jepsen (1940). Paleocene faunas of the Polecat Bench formation, Park County. Wyoming. Pro. Amer. Philos. Soc 83, 217–340.
- Z. Kielan-Jaworowska & J. H. Hurum (2001). Phylogeny and Systematics of multituberculate mammals. Paleontology 44, 389–429.
- David Krause (1977). Paleocene multituberculates (Mammalia) of the Roche Percee Local Fauna, Ravenscrag Formation, Saskatchewan, Canada. Palaeontographica Abt, A 186, 1–36.
- C. R. Scott, R. C. Fox RC, and G. P. Youzwyshyn (2002). New earliest Tiffanian (late Paleocene) mammals from Cochrane 2, southwestern Alberta, Canada. Acta Palaeontologica Polonica 47 (4), 691–704.
- R. E. Sloan (1981). Systematics of Paleocene multituberculates from the San Juan Basin, New Mexico. In Lucas et al. (Ed.), Advances in San Juan Basin paleontology, 127–160. University of New Mexico Press, Albuquerque.
- * Much of this information has been derived from MESOZOIC MAMMALS; Ptilodontoidea, an Internet directory.
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