Raoellidae

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Raoellidae
Indohyus BW.jpg
Indohyus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla[1]
Family: Raoellidae
Sahni et al. 1981
Genera

Raoellidae, previously grouped within Helohyidae, is an extinct family of semiaquatic digitigrade artiodactyls in the clade Whippomorpha. Fossils of raoellids are found in Eocene strata of South and Southeast Asia.

An exceptionally complete skeleton of Indohyus from Kashmir indicates that raoellids are the "missing link" sister group to whales (Cetacea)[2] All other Artiodactyla are relatives of these two groups. δO18 values and osteosclerotic bones indicate that the raccoon-like Indohyus was habitutually aquatic, but δC13 values suggest it rarely fed in the water. The authors suggest that this documents an intermediate step in the transition back to water completed by the whales.

Taxonomy[edit]

Notes[edit]

References[edit]

  • Dehm, Richard; Oettingen-Spielberg, Therese zu (1958). Paläontologische und geologische Untersuchungen im Tertiär von Pakistan. 2. Die mitteleocänen Säugetiere von Ganda Kas bei Basal in Nordwest-Pakistan. Abhandlungen / Neue Folge, 91. Munich: Beck. OCLC 163296508. 
  • Kumar, K.; Sahni, A. (1985). "Eocene mammals from the upper Subathu Group, Kashmir Himalaya, India". Journal of Vertebrate Paleontology 5 (2): 153–68. doi:10.1080/02724634.1985.10011853. OCLC 4649653478. 
  • Pilgrim, G. E. (1940). "Middle Eocene mammals from north-west Pakistan". Proceedings of the Zoological Society. B (London) 110: 127–152. 
  • Rao, A Ranga (1971). "New mammals from Murree (Kalakot Zone) of the Himalayan foot hills near Kalakot, Jammu and Kashmir state, India". Journal of the Geological Society of India 12 (2): 124–34. 
  • Sahni, A.; Bhatia, S. B.; Hartenberger, J. L.; Jaeger, J. J.; Kumar, K.; Sudre, J.; Vianey-Liaud, M. (1981). "Vertebrates from the Subathu Formation and comments on the biogeography of Indian subcontinent during the early Paleogene". Bulletin of the Geological Society of France 23 (6): 689–95. 
  • Sahni, A. S. H. O. K.; Khare, S. K. (1971). "Three new Eocene mammals from Rajauri District, Jammu and Kashmir". Journal of the Palaeontological Society of India 16: 41–53. 
  • Thewissen, JGM; Cooper, Lisa Noelle; Clementz, Mark T; Bajpai, Sunil; Tiwari, BN (20 December 2007). "Whales originated from aquatic artiodactyls in the Eocene epoch of India". Nature 450 (7173): 1190–4. doi:10.1038/nature06343. OCLC 264243832. PMID 18097400. Retrieved June 2013.