Killer Crab Alien
From Alien Species
An alien formed form a giant crab insect. this alien has 2 back legs and a 4 arms. the 2 lower arms can be used as the front legs while the top 2 can be used to grab prey.
The alien can fire what apears to be silver chestbursters from its 2 chest cavities.
It also posses a pronged tail to impale victems or possible host's
