Calcinus, Clibanarius, and Paguristes are some of the most common "clean-up crew" hermit crabs for algae control and to eat leftover foods and detritus. Hermit crabs that are underfed are also a greater threat to tankmates like snails and other invertebrates.
The coconut crab is the only species of the genus Birgus, and is related to the terrestrial hermit crabs of the genus Coenobita. It shows a number of adaptations to life on land. Like other hermit crabs, juvenile coconut crabs use empty gastropod shells for protection, but the adults develop a tough exoskeleton on their abdomen and stop carrying a shell.
Coenobita compressus. Land hermit crabs are not bred in captivity for the pet trade. Captive breeding land hermit crabs have been done, but it is not currently a commercially viable process, so all the hermit crabs found in pet stores are wild caught.
Each hermit crab has a pair of claws and 2 pair of walking legs (5 pair of leg appendages in all). Hermit crabs in the families Paguridae and Diogenidae are all aquatic marine crabs. The terrestrial hermit crabs found in many pet stores belong to another family and can be found in Florida and the Caribbean areas.
Paguristes cadenati is very hardy and requires minimal care in a well-established system. More importantly, however, these small hermit crabs have a voracious appetite for detritus and algae. In fact, they are particularly fond of nuisance algae of the filamentous, hair, and slime varieties, as well as cyanobacteria. Finally, unlike some hermit crabs, most Scarlet Reef Hermit Crabs are very peaceful towards their tankmates.
A worldwide taxonomic and distributional synthesis of the deep-water hermit crab genus Oncopagurus Lemaitre, 1996 is presented. This genus, originally defined for 10 species is set apart from other Parapaguridae as well as other Paguroidea, by one synapomorphy: the presence of an upwardly curved epistomial spine.
After sockeye salmon, red king crab is the most valuable fishery in Alaska. The crab meat is eaten as crab legs (e.g., with drawn butter), sushi, or in a variety of other dishes. Red king crabs are caught in heavy metal pots in a fishery that is famous for its dangerous seas and weather. To read more about red king crab fishing, click here.