This jumping spider mimics an ant and preys either on the ants themselves, or on other insects.
Note how it only has six legs on the ground with the front two acting as antennae, and it walks around with the same type of jerky motion which is typical for an ant.
The extraordinarily extended fangs are part of the same deception, making the spider look like a heavily fortified soldier ant.
Myrmarachne maxillosa is only about 1 cm in size.

Tub Kaek Beach area, Krabi, Thailand, 2 February 2013