How many types of land hermit crabs are there?

There are seven main types found in captivity.

Coenobita Clypeatus - Purple Pincher

Coenobita Compressus - Ecuadorian

Coenobita Brevimanus - Indo

Coenobita Perlatus - Strawberry

Coenobita Cavipe

Coenobita Violensus

Coenobita Rugosus