Mantis (Barotrauma)

The Mantis is a species of horse-sized crustacean that was discovered within the oceans of Europa.

Biology
Despite the name, they more closely resemble giant shrimps than they do preying mantises. They are amber in coloration, with a highly durable carapace that is reported to withstand bullet shots at close range, making firearms less of an option to defend oneself against these creatures. They have three sets of limbs, two of which they can use to crawl along the seafloor and the third able to be used to attack prey. Like Crawlers, their armor doesn't extend to their underbelly, making that their weak spot to most predators, if they can reach it.

Behavior
Mantises are often found either alone or in mated pairs. They're also known for entering the hulls of submarines, tearing through steel doors with their large claws and attacking crew members.