(Huxley, 1859)
Dorsal and ventral facets of anterior nectophore relatively more regularly pentagonal and of nearly equal size. Strongly serrated ridges. Lateral radial canals on nectosac without ascending loop. Posterior nectophore less than twice as long as wide, with relatively large apical apophysis. Dorsal facet of cuboidal bract forms a regular pentagon; apico-lateral facets rectangular.