This list pulled information for all of Tanzania, so it isn't specific to Dar.
The coconut crab, Birgus latro, is the largest land-living arthropod in the world, and is probably at the upper limit of how big terrestrial animals with exoskeletons can become in today's atmosphere. The species inhabits the coastal forest regions of many Indo-Pacific islands, although localized extinction has occurred where the crab is sympatric with man. Generally nocturnal, ...more ↓
Coenobita brevimanus is a species of land hermit crab native to the east coast of Africa and the south west Pacific Ocean. Adults of this species can be larger than any other species from the genus Coenobita, weighing up to 0.5 pounds (230 g).
Coenobita perlatus, is a species of terrestrial hermit crab. It is known as the strawberry hermit crab because of its reddish orange colours. It is a widespread scavenger across the Indo-Pacific, and is also traded to hobby aquarists.
Coenobita rugosus is a species of land hermit crab native to Australia and the east African coast to the south west Pacific.