Genus Hsiungia K'ung and Yang, 1964

General. Middle-sized Cyathostominae. MC inflated, high, ring-shaped, divided into inner and outer rings. Posterior edge of MC at anterior edge of BC. Amphids not markedly projected through MC surface. Tip and longer stalk of submedian papillae extend through MC. Tip of submedian papillae bullet-shaped, twice as long as broad. Stalk of submedian papillae longer than broad. Number of elements of ELC equal, or nearly so, to ILC. ELC longer than ILC. Elements of ELC longer than broad, tips pointed; insertion point on tips of ILC. Elements of ILC longer than broad, tips pointed; insertion on anterior edge of BC. Line formed by insertion of elements of ILC straight. Form of posterior edge of elements of ILC straight, unadorned. Support for ELC continuous with BC, elongate, curving, thin at one end. Septum intracoronare origin on support. Medial insertion of septum intracoronare situated at junction of ELC and ILC. Walls of BC straight, thickening gradually to greatest thickness at base. Buccal cavity wider than deep, cylindrical. Dorsal gutter nipple- or button-like. Buccal teeth absent. Esophageal funnel enlarged. Esophageal teeth prominent. Anterior muscular portion of esophagus about 1/4 to 1/3 of esophagus length. Excretory pore posterior to NR. Anterior deirids near middle of glandular esophagus.

Male: Dorsal ray with 6 branches. Ventral rays longer than laterals. Dorsal lobe equal in length to lateral lobes. Externodorsal rays origin at junction of dorsal and laterals. Gubernaculum large, with dorsal handle & ventral notch. Genital cone short, conical. Spicule tips straight or slightly curved.

Female: Vulva 2-3, or more, tail lengths from anus. Vagina shorter than sphincter of ovejector. Ovejector vestibule oval or Y-shaped, infundibulum about equal to sphincter. Tail conical, long, more than 2x diameter at anus.

Type species: H. pekingensis Kung and Yang, 1964

Discussion

This species, while similar to Cylicocyclus in shape of the wall of the buccal capsule, has some primitive characters not present in that genus, including a short anteriorly placed vagina and a spicule without an anchor shaped tip and with alae. The single species of Hsiungia, H. pekingensis, appears, to be closer to Poteriostomum than to Cylicocyclus except for the male bursa. This interesting species must be studied further to determine its relationship within the Cyathostominea. It is hoped that recognition at the genus level, following Dvojnos and Kharchenko (1988), will stimulate study of this species.