Palaeoloxodon namadicus

Asian straight-tusked elephant Temporal range: Pleistocene PreЄ Є O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Proboscidea
Family:	Elephantidae
Tribe:	Elephantini
Subtribe:	†Palaeoloxodontina
Genus:	†Palaeoloxodon
Species:	†P. namadicus
Binomial name
Palaeoloxodon namadicus Falconer & Cautley, 1846

Palaeoloxodon namadicus or the Asian straight-tusked elephant, was a species of prehistoric elephant that ranged throughout Pleistocene Asia, from India (where it was first discovered) to Japan. It is a descendant of the straight-tusked elephant.

Legbone

Some authorities regard it to be a subspecies of Palaeoloxodon antiquus, the straight-tusked elephant, due to extreme similarities of the tusks. Their skull structure was also different from that of a modern elephant.

Size

Several studies have attempted to estimate the size of the Asian straight-tusked elephants, as well as other prehistoric proboscideans, usually using comparisons of thigh bone length and knowledge of relative growth rates to estimate the size of incomplete skeletons.

One partial skeleton found in India in 1905 had thigh bones that likely measured 165 centimetres (5.41 ft) when complete, suggesting a total shoulder height of 4.5 metres (15 ft) for this individual elephant.

Two partial thigh bones were found in the 19th century and would have measured 160 cm (5.2 ft) when complete. A fragment from the same locality was said to be almost a quarter larger; volumetric analysis then yields a size estimate of 5.2 metres (17 ft) tall at the shoulder and 22 tonnes (24 short tons) in weight. This makes P. namadicus the largest land mammal known, surpassing the largest indricotheres.^{[1] (units:tonnes = 1000 kilograms, long ton= 2,240 pounds, short ton=2000 pounds)}

References