Stiasny, 1921
Mouth-arms dichotomous, in cross-section triangular or three-winged; peripherally from stomach, a network of anastomosing canals communicating direct with stomach, alternating with radial canals; rhopalial pits smooth, radial folds lacking; subgenital ostia without papillae.
Family Cepheidae
Family Mastigiidae |
