Calcinus haigae Haig'sHermitCrab2 DMS, author: ReefLifeApps.com
Lithoscaptus aquarius (photo from aquarium), author: van der Meij, Sancia E.T.
Portunus xantusii at Ventura, CA, author: Clabuesch, Cecilia
Caridina spongicola

DecaNet (World List of Decapoda)