Fraseroscyphus Boero & Bouillon, 1993

Song, Xikun, Xiao, Zefeng, Gravili, Cinzia, Ruthensteiner, Bernhard, Mackenzie, Melanie, Wang, Shaoqing, Chen, Jinjing, Yu, Nan & Wang, Jianjun, 2016, Worldwide revision of the genus Fraseroscyphus Boero and Bouillon, 1993 (Cnidaria: Hydrozoa): an integrative approach to establish new generic diagnoses, Zootaxa 4168 (1), pp. 1-37 : 14-15

Genus Fraseroscyphus Boero & Bouillon, 1993

Emended diagnosis. Colony with upright hydrocaulus, monosiphonic, erect, slightly zigzag, unbranched or branched, hydrocladia usually originate from within the hydrothecal cavity, sometimes directly growing on hydrocaulus beneath a hydrotheca, without axillary hydrotheca, without stem apophysis. With regular and oblique nodes, each internode bearing a hydrotheca. Hydrothecae alternately arranged in two rows almost in one plane, or forming an angle less than 90º, sometimes spirally arranged in three longitudinal rows; hydrotheca tubular, partly adnate, with three marginal cusps, one adcauline and two lateral abcauline, and three operculum flaps forming a pyramid; retracted hydranth with poorly developed abcauline caecum. Clinging organ present, resembling bubbly lobes. Gonotheca generally originate from within the hydrothecal cavity or growing directly from hydrocaulus, pedicellate, with a short distal neck, sexually dimorphic. Nematocyst capsule spindle-shaped, microbasic mastigophores.

Type species. Sertularella sinuosa Fraser, 1948 , by original designation by Boero & Bouillon (1993), a junior subjective synonym of Fraseroscyphus hozawai .