Dana, 1851
Carapace slightly broader than long, with an hexagonal outline. Surface smooth or finely granular. Lateral margins having an angle furnished with an epibranchial spine, separating the antero-lateral from the postero-lateral margins, that are slightly longer. Posterior margin straight and shorter than the front. Front divided into four teeth or two projecting lobes and separated by a large antennal furrow from the supero-internal orbital angles that may be indicated by a spine. A strong spine, often dorsally visible, at the internal infraorbital angles. Orbits large and shallow, not hiding most of the eyes. Chelipeds slightly unequal and dissimilar; size and ornamentation of the merus varying along the species. Ambulatory legs generally thin; merus of P4 about four times longer than broad; dactylus denticulate. Commensal crabs associated with corals. (Guinot 1998)
Type species: Quadrella coronata Dana, 1852.
Species treated:
Quadrella boopsis Alcock, 1898
Quadrella coronata Dana, 1852
Quadrella maculosa Alcock, 1898
Quadrella reticulata Alcock, 1898
Quadrella serenei Galil, 1986