Although you might think the hermit crab is its own species, there are actually hundreds and hundreds of them! However, most of the hermit crabs that are owned as pets are one of a handful of specific species.
Hermit crab species differ widely from one another. Some areonly a few millimeters long, whereas others can grow to be the sizeof a coconut. Similarly, their life spans can range anywherebetween ten and eighty years. On the whole, there are six differentfamilies and over 1,000 species of hermit crabs that are containedin the superfamily Paguroidea.