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Coenobita clypeatus and Lithopoma tectum
Most species of hermit crabs are aquatic and live in varying depths of salt water, from shallow reefs and shorelines to deep sea bottoms. Tropical areas host some terrestrial species, though even those have aquatic larvae and therefore need access to water for reproduction. But the Caribbean Hermit Crab also known as the soldier crab, the West Atlantic crab, the tree crab, and the purple pincher (due to the distinctive purple claw), is a species of land hermit crab. Adults burrow and hide under the roots of large trees, and can be found a considerable distance inland. It is both herbivorous and scavengers. In the wild, it feeds on animal and plant remains, overripe fruit, and feces of other animalsMost hermit crabs are nocturnal.
I found this little guy up high on the hill, in my garden around 10am. It is native to the west Atlantic, Bahamas, Belize, southern Florida, Venezuela, the Virgin Islands, and the West Indies.
Hermit crab species range in size and shape, from species with a carapace only a few millimetres long to Coenobita brevimanus, which can live 12–70 years and can approach the size of a coconut. I've in fact seen hermit crab inhabit big conch shells.
Thank you so much, J.S.! I've been trying to figure out what can of shell that was for a very long time. I find them a lot of certain beaches here in Antigua.