Discovery of a deep-sea echiuran in the North-East tropical Atlantic, with redescription of the species

This report contains a redescription of Alomasoma chaetiferum Zenkevitch, 1958, a deep-sea bonellid (Bonelliidae) that was collected off the coast of Mauritania (18 °31.1'N - 21°2.8'W) in the North-East tropical Atlantic. The discovery of this species at the above locality is the first record of its occurrence in the Atlantic Ocean and now considerably extends its range of distribution.