Slender-bodies barracudinas were collected from Taiwan and examined, and five species spanning two genera, Dolichosudis and Stemonosudis, were identified. Stemonosudis siliquiventer, previously known from the Atlantic Ocean only, was newly recorded in Taiwan, as well as the western Pacific Ocean. Adult Stemonosudis gracilis (tentatively identified) and Stemonosudis miscella specimens were collected, as well; previously, only juveniles or small individuals had been reported in Taiwan. Detailed descriptions have been provided herein for these species, as well as the final two, Stemonosidus rothschildi and Dolichosudis fuliginosa. Detailed descriptions are provided for all these species.