Remingtonocetus is an extinct genus of early carnivorous freshwater aquatic

Aquatic animal

An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environments and the animals that...

 mammal

Mammal

Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young...

s of the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Remingtonocetidae

Remingtonocetidae

Remingtonocetidae is a family of early carnivorous freshwater aquatic mammals of the order Cetacea endemic to the coastline of the ancient Tethys Ocean during the Eocene living from 55.8—48.6 mya, existing for approximately ....

endemic to the coastline of the ancient Tethys Ocean

Tethys Ocean

The Tethys Ocean was an ocean that existed between the continents of Gondwana and Laurasia during the Mesozoic era before the opening of the Indian Ocean.-Modern theory:...

 during the Eocene

Eocene

The Eocene Epoch, lasting from about 56 to 34 million years ago , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to the beginning of the Oligocene Epoch. The start of the...

 living from 48.6—37.2 mya, existing for approximately .

Taxonomy

Remingtonocetus was named by Kumar and Sahni (1986). Its type is Protocetus harudiensis. It was considered monophyletic by Uhen (2010). It was assigned to Cetacea by Sepkoski (2002). To Remingtonocetidae by Kumar and Sahni (1986), Gingerich and Russell (1990), Benton (1993), McKenna and Bell (1997), Bajpai and Thewissen (1998), Williams (1998), Thewissen et al. (2001), Gingerich et al. (2001), Geisler and Sanders (2003), McLeod and Barnes (2008) and Uhen (2010).

Morphology

Remingtonocetus had four working and usable limbs, a slender whale

Whale

Whale is the common name for various marine mammals of the order Cetacea. The term whale sometimes refers to all cetaceans, but more often it excludes dolphins and porpoises, which belong to suborder Odontoceti . This suborder also includes the sperm whale, killer whale, pilot whale, and beluga...

-like body with long tail and slender, hydrodynamic head.

Fossil distribution

Two specimens were found near the coastal border of Pakistan

Pakistan

Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

 and India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 and north central Pakistan.

External links

• Remingtonocetus in the Paleobiology Database
  Paleobiology Database
  ' is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms.-History:The Paleobiology Database was founded in 2000. It has been funded by the National Science Foundation and the Australian Research Council...