ABSTRACT
Neocnus incubans is a littoral species of brooding holothuroid known only from the Mediterranea and the N.E. Atlantic (Canary Islands). N. incubans broods its offspring within a large marsupium that opens through a mid-dorsal and longitudinal slit. The marsupium is an integumentary cavity consisting in two chambers that are each divided into several compartments by thick partitions. The brooders may be numerous (up to twenty four). They remain in the marsupium until an advanced postmetamorphic stage, i.e. when the buccal tentacles and terminal podia are differentiated.
