Land vs. Marine Hermits

[CAPSLOCK]

All right, someone asked me this a while ago and I wondered if anyone here knows.
Are land hermits and underwater marine hermits the same species?
Are they different but both have the same habits, so they were named the same?
Are they slightly different species?
Are they all marine but they can live on dry land or totally submerged?

I know that different hermits come from different places within the ocean, so do they just take intertidal hermits and sell them as dry land hermits, or are they really different?

It's all really one question, but just different ideas I've thought of.

 

[wayne]

No there are hundreds of different species of hermit crabs
No
No, very different
No

That answers the questions but basically there are numerous species of hermit crabs with different enviromental needs.