Subgenus Antho (Acarnia) Gray, 1867

The subgenus Antho (Acarnia) is defined as “ Antho with predominantly (acantho)tylostrongyles forming the renieroid skeleton, less often acanthostyles, and a special category of echinating acanthostyles overlap the main skeleton ” (Hooper 2002 [2004]b). There are 19 accepted species worldwide (de Voogd, et al. 2023) spread widely in several of the world’s oceans: Arctic, Bering, White, Barents and Kara seas, Northwest Pacific, Northeast Atlantic, Southeast Indian oceans and the Caribbean. Depth ranges are discontinuous from low tide to 1360 m.