TRIGONOSTOMUM SCHMIDT, 1852

Trigonostomum Schmidt, 1852: 500; Graff, 1905: 73, 113; 1908: 2542; 1913: 302–303; Meixner, 1924b: 91–92, 96, 103; Luther, 1948: 36, 38; Den Hartog, 1964: 373, t. 1; Ax, 1971: 146– 150, fig. 1.

Vortex Schmidt, 1857: 352, 356.

Spiroclytus Schmidt, 1857: 352, 356; Claparède, 1863: 15.

Orcus Uljanin, 1870: 19 .

Kylosphaera Jensen, 1878: 16, 36, 44–45.

Hyporhynchus Graff, 1882: 336 .

Hyporcus Graff, 1905: 73, 1910; 1908: 2542; 1913: 299.

Woodshollia n.n. Graff, 1910: 947.

Woodsholia Graff, 1911a: 198; 1911b: 61; 1913: 312.

Woodsholia Graff, 1911b: 65 .

Diagnosis: Trigonostominae with anterior integumental invagination, connected with the body wall by several muscles. Pharynx situated anteriorly, strongly inclined forwards, with 11 radial muscles lengthwise and 24 in cross section. Paired testes at 50%, caudal to the pharynx.

Type species: Trigonostomum setigerum Schmidt, 1852