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Gallus is a bird genus in the family Phasianidae, the type species is the red junglefowl.
The red junglefowl and common pheasant are now known to have diverged about 18–23 million years ago, and belong to different subfamilies.

1/ Red junglefowl (Gà rừng lông đỏ, Gallus gallus) 

Red junglefowl (Gà rừng lông đỏ, Gallus gallus) 

The red junglefowl (Gallus gallus), also known as the Indian red junglefowl (and formerly the bankiva or bankiva-fowl), is a species of tropical, predominantly terrestrial bird in the fowl and pheasant family, Phasianidae.
The bird is found across much of Southeast and parts of South Asia.

galliformes derives from "gallus", Latin for "rooster". 
Phasianidae from Phasianus: Latin for "pheasant", derived from the Ancient Greek φἀσιἀνος, phāsiānos, meaning "(bird) of the Phasis", the River Phasis (now the Rioni) in Colchis on the east coast of the Black Sea (now western Georgia).