Habitat: Common between and under coral rubble, in shallow reefs and seagrass environments. Distribution: Caribbean. Characteristics: Thick encrusting (up to 4 cm thick). Dull reddish to yellowish brown externally, lighter color internally. Smooth surface, leathery to the touch. Compressible in consitency. Notes: This species represents what was referred in the literature as S. cunctatrix or S cf. mollis from Panama and elsewhere in the Caribbean. S. cunctatrix is very similar, but is a north Atlantic species with distinct genetic and skeletal identities.