Madagascarchaea gracilicollis

Madagascarchaea gracilicollis is a member of the family Archaeidae, assassin spiders. It is merely 2 mm long and catches other spiders with venomous fangs at the end of its hugely elongated jaws (chelicerae).

These animals normally run upside down.

Etymology
From Latin gracilis "slender" and collum "neck".

Distribution
This species is endemic to Madagascar.