soldier crab

noun5

1. •
   Any of several species of crabs
2. •
   Common hermit crab (Pagurus bernhardus), of Europe.
3. •
   Caribbean hermit crab (Coenobita clypeatus).
4. •
   Any member of the species Dotilla myctiroides, a true crab from South-east Asia.
5. •
   Any member of the species Mictyris longicarpus, of the Indo-West Pacific.