A. antillarum (Grübe & Oersted, 1858)

(Fig. 4 A)

Material. Nha Trang Bay: Tre Island, intertidal, fouling community, 11 specimens.

Description. Trunk 10–20 mm in length, 4 mm in width, yellow-brown, with dark brown papillae especially large, crowded at anterior trunk and introvert base; distal introvert smooth, yellow, with distinct collar. Introvert shorter than trunk; numerous (up to 70–80) digitiform tentacles with brown strips and patches, surrounding the nuchal organ; hooks absent.

Discussion. This is the only species of the genus Antillesoma. It is a circumtropical and subtropical species that is known from the Atlantic, Indian and Pacific Oceans. In the West Pacific, it has been reported from Australia to Taiwan, and is usually found at intertidal and shallow depths in soft rocks and dead corals.