Mirelurk (Fallout 4)

Mirelurk is a creature appearing in the Boston area.

Characteristics
An unknown aquatic creature that appears in Fallout 4. This specimen in particular resembles a mirelurk hunter, but also differs in several aspects, such as seen with their legs. This specimen also walks in a mixed crab/spider-like motion, which is atypical of mirelurk variants documented so far.