Sphaerephesia amphorata sp. n., paratypes, USNM 1002041, SEM. A Whole specimen, dorsal view B Same, ventral view C Anterior end, showing head appendages, dorsal view D Same, with head papillae visible E Same, lateroventral view; mouth and nuchal organ pits, visible F Anterior end, ventral view G Posterior chaetigers, dorsal view, showing the characteristic dorsal macrotubercles with long terminal papillae H Mid-body chaetigers, ventral view. Abbreviations: lateral antenna; ma, median antenna; mo, mouth; no, nuchal organ; pa, palp; tc, tentacular cirrus.