Bombay Swampeel

This species is thought to be endemic to the northern Western Ghats of India, in the state of Maharashtra. It is currently known from 5-10 localities: Robber's Cave and Dhobi Falls in Mahabaleshwar, Kanheri Falls near Kanheri Caves in Mumbai, and the Tamhini and Tail Baila areas in Pune. However, it is thought to occur in other localities as well.

They are nocturnal and during the daytime, they stay buried underneath boulders or hang to tree roots along the edges of streams. They are obligate air breathers and prefer to float on the surface of the water to breathe, then dive for 3-5 minutes before returning to the surface. They primarily feed on earthworms by creating a vacuum with their mouths and sucking them in. In an example of Batesian mimicry, if an O. indicus is threatened, it can bare its fangs in a way similar to a snake. They can also burrow into the mud and use a mucus secreted from their body to fully retract inside if a threat is detected.