Supriya Ghosh (Editor)

Elephantidae

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Kingdom  Animalia
Order  Proboscidea
Scientific name  Elephantidae
Phylum  Chordata
Superfamily  Elephantoidea
Elephantidae African Elephant Loxodonta africana Proboscidea Elephantidae

Family  ElephantidaeGray, 1821
Length  Asian elephant: 5.5 – 6.5 m
Mass  African bush elephant: 6,000 kg, Asian elephant: 5,400 kg, African forest elephant: 2,700 kg
Gestation period  African bush elephant: 22 months, Asian elephant: 18 – 22 months
Lifespan  African bush elephant: 60 – 70 years, Asian elephant: 48 years, African forest elephant: 60 – 70 years
Height  African bush elephant: 3.3 m, Asian elephant: 2.7 m
Lower classifications  mammoth, Asian elephant, African elephant, Elephas, Straight‑tusked elephant

Elephantidae is a family of large, herbivorous mammals collectively called elephants and mammoths. These are terrestrial large mammals with a snout modified into a trunk and teeth modified into tusks. Most genera and species in the family are extinct. Only two genera, Loxodonta (African elephants) and Elephas (Asiatic elephants), are living.

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Elephantidae ElephantTattooArtElephantPictureElephant Februari 2010

The family was first described by John Edward Gray in 1821, and later assigned to taxonomic ranks within the order Proboscidea. Elephantidae have also been revised by various authors to include or exclude other extinct proboscidean genera.

Elephantidae httpsuploadwikimediaorgwikipediacommons00

Classification

Elephantidae Elephantidae

The family diverged from a common ancestor of the mastodons of Mammutidae. The classification of proboscideans is unstable and has been frequently revised.

The following cladogram shows the placement of the genus Mammuthus among other proboscideans, based on hyoid characteristics:

Elephantidae Elephantidae


The systematics of the living subspecies and species, the modern elephants, has undergone several revisions. A list of extant Elephantidae, excluding the extinct species of the two genera, includes:

ElephantidaeElephas (Asiatic)E. maximus Asian elephantE. m. maximus Sri Lankan elephantE. m. borneensis Borneo elephantE. m. indicus Indian elephantE. m. sumatranus Sumatran elephantLoxodonta (African)L. africana African bush elephantL. cyclotis African forest elephant

Scientific classification of Elephantidae taxa embraces an extensive record of fossil specimens, over millions of years, some of which existed until the end of the last ice age. Some species were extirpated more recently. The discovery of new specimens and proposed cladistics have resulted in systematic revisions of the family and related proboscideans.

Elephantids are classified informally as the elephant family, or in a paleobiological context as elephants and mammoths. The common name elephant primarily refers to the living taxa, the modern elephants, but may also refer to a variety of extinct species, both within this family and in others (see Elephant (disambiguation)). Other members of Elephantidae, especially members of Mammuthus, are referred to by the common name mammoth.

Evolutionary history

Although the fossil evidence is uncertain, by comparing genes, scientists have discovered evidence that elephantids and other proboscideans share a distant ancestry with Sirenia (sea cows) and Hyracoidea (hyraxes). These have been assigned with the demostylians to the clade Proboscidea. In the distant past, members of the various hyrax families grew to large sizes, and the common ancestor of all three modern families is thought to have been some kind of amphibious hyracoid. One hypothesis is that these animals spent most of their time underwater, using their trunks like snorkels for breathing. Modern elephants have this ability and are known to swim in that manner for up to six hours and 50 km (31 mi).

In the past, a much wider variety of genera and species were found, including the mammoths and stegodons.

References

Elephantidae Wikipedia