Cirripedia Thoracica (Crustacea) collected during the “ Campagne de La Calypso (1961 - 1962) ” from the Atlantic shelf of South America Author Young, Paulo S. Museu Nacional / UFRJ, Quinta da Boa Vista, 20940 - 040, Rio de Janeiro, RJ (Brazil) psyoung @ acd. ufrj. br text Zoosystema 2000 22 1 85 100 journal article 10.5281/zenodo.5395280 1638-9387 5395280 6D2F4BB8-4A20-43A3-BDCD-C3877304A6C7 Acasta cyathus Darwin, 1854 Acasta cyathus Darwin, 1854: 312 , pl. 9, fig. 3A-C. – Pilsbry 1916: 244, figs 79, 80, pl. 57, figs 1-3. MATERIAL EXAMINED . — La Calypso, stn 22, 33 m , 1 specimen rc 10mm ( MNHN Ci2725). — Stn 46, 32 m , 17 specimens rc 3-9mm ( MNHN Ci2726). — Stn 69, 39 m , 1 specimen rc 6 mm ( MNHN Ci2756). OTHER MATERIAL EXAMINED . — Pernambuco , Porto de Galinhas. Rasinho do Coiceiro, 2 specimens rc 7-8 mm ( MNRJ 5471). — Taçaíba,> 100 specimens rc 4-8 mm ( MNRJ 5462). Bahia . Itacaré, Cachimbo,> 50 specimens rc 2-10 mm ( MNRJ 4230). — Itacaré, Ribeira Beach,> 50 specimens rc 4-7 mm , ( MNRJ 4007, 4224). — Abrolhos, Paredes reef, 13 specimens rc 6-12 mm ( MNRJ 4226). REMARKS Acasta cyathus is a common species found associated with several species of sponges along all the tropical oceans. Young (1995) recorded this species as ranging to 18°S from Brazil . The new samples show a wide tropical South Atlantic distribution of this species from 8°S to 18°S . It is presently the only species of Acasta found along the Brazilian coast.