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