Habitat: Cosmopolitan in tropical and subtropical waters; intertidal and shallow subtidal in crevices of coral rubble or soft rock. Distribution: Very common in Bocas del Toro. Characteristics: Relatively large species (max. reported trunk length 80 mm, but generally 30-40 mm); trunk covered with large, dark papillae, especially around the anterior end; short introvert with up to 200 long, digitiform tentacles usually with purple or green pigment.