Overviews of Aliens (TFTD)
All aliens are not, of course, equal. While a novice may be overwhelmed at any manifestation of Alien presence, he will soon learn to cope, and discern the abilities of his enemy. For those who aren't yet well-versed in such things, here's a rundown on how mean each of these creatures can be in a fight. For more details, look at aliens' specific pages or Alien Stats (TFTD).
Low Threat
Medium Threat
High Threat
High Threat: Tentaculat - Terror Unit
Tentaculats are very similar to a Chryssalid. These big brain creatures have the same ability to proliferate by zombifying their targets into mindless walking incubators for their young. They are only found in water and are generally found guarding Dreadnaughts, Terror Ships or alien structures. Tentaculats are able to raise or lower their elevation in the water with impunity. In short: Underwater flying Chryssalids.
Methods of Dispersal : Phosphorous rounds,explosives and a healthy dose of luck.
See Also Chryssalid | Zombie | Tentaculat