Land Crabs live on land and Marine crabs live in water.
Land crabs (most pets are) do need it while marine crabs like the ones you find at the beach do not.
You can tell a land hermit crab from a water hermit crab by looking at the claws/arms or legs. If it is a water crab it will be blueish and if land crab it will be pinkish purpleish. If your crab is a water crab don't just throw it in water and leave it there, put a tiny bowl in it's tank or cage that is low to the ground and make sure that the water level is a bit lower than the hermit crabs top of its legs. Also have a wet sponge for each kind of hermit crab in the crabs tank.
I'm not sure what you mean by this question. Hermit Crab is a term used to refer to many different species of crabs that live in shells that have been cast off by snails. They can be marine hermit crabs, or land hermit crabs. Within these categories there are many different species. The Genus Coenobita contains 16 different species of terrestrial (land) hermit crabs. The Genus Paguras refers to those species of marine hermit crabs.
Crabs are usually marine creatures, they occure mainly in oceans although some have become terrestrial (land crabs) whis then live in reasonable proximity to oceans.
Marine hermit crabs live underwater and can sometimes be found in tidepools. Land hermit crabs do not live in the water but need fresh and salt water to survive.
Penguins, seabirds, seals, Marine Iguana, some crabs, mud skippers.
For land hermit crabs: Tropical or sub-tropical beaches/jungles. For marine hermit crabs: Oceas, seas, tidepools, beaches of all latitudes.
Virginia = stable crops and land ; Massachusetts= marine trade and commerce
Marine iguanas, uniquely among all lizards, can forage in the sea, feeding on salt-saturated seaweed and exuding salt via tears.
There are several species of Land Hermit Crabs and hundreds of species of Marine Hermit Crabs. As requested, here are 5 species of Land Hermit Crabs. Coenobita Clypeatus (Purple Pincher) coenobita Compressus (Ecuadorian) Coenobita Rugosus (Rug) Coenobita Perlatus (Stawberry) Coenobita Violensus (Viola) Coenotiba Bervimanus (Indo) - a bonus one!
Blue land crabs, hermit crabs, purple land crabs, and Halloween crabs are a few crabs that live on land. They burrow during the day and sleep then come out and eat during the night.
an octopus has a squishy outer layer and a crab has a hard shell to protect it. the crab has claws to catch its food and an octopus has suckers to latch on to its prey. an octopus can also squeeze into really small spaces because it can move its skin and shrinks down to size. that is the difference between a crab and an octopus.