Dolichostomus leucotaenia gen. et sp. nov. is described from two specimens collected from off northern Vietnam. It is characterized by a long, oval mouth opening visible from the ventral view, a feature unique among the order Myxiniformes. It also possesses a single medial nasal‐sinus papilla and branchial slime pores positioned external to the gill‐aperture series. Moreover, it can be further distinguished by its slender body...

A new species of the whalefish genus Cetomimus is described based on eight female specimens from the Japanese seas, eastern Australia and the South Atlantic. The females of the new species, Cetomimus papilio sp. nov ., can be distinguished from its congeners by the presence of tent‐like lateral‐line flaps that are wider than the lateral‐line canal, lateral‐line pores 11–14, internal cavernous tissue surrounding the anus and th...