Calcinus laevimanus is common but shallow, living primarily on intertidal and very shallow subtidal reefs. The Nerita polita shell occupied by the first one below measured about 25mm long. The larger hermits, like the first one, have large left chelipeds, mostly black with the claw portion white.
The hermit in the two photos below has identical color to the above Calcinus laevimanus, but its left cheliped is much smaller. It could be regrowing a lost one, or smaller crabs may have proportionally smaller chelipeds. The Engina mendicaria shell occupied by the one below was less than 14mm in length.
Created 10 August 2018