Trileptium Cobb, 1933 (adapted from PLATT & WARWICK 1983, NICHOLAS 2007)

Type species. Trileptium guttatum (Cobb, 1920) .

Diagnosis. Cuticle may be smooth or slightly striated. Three small lips, one dorsal and two subventral. The cephalic setae are arranged in three circles: six inner labial, six outer labial and four cephalic. Males also have a circle with subcephalic setae. The buccal cavity consists of one or three teeth, with similar sizes, well developed and positioned near the opening of the cavity. Subventral teeth may be located at the same level or more anterior to the dorsal tooth. Underdeveloped jaws may or may not be present. The genus has variable shapes and arrangements of spicules and gubernaculums. A pre-cloacal supplement may be present or absent.

Species included. This genus includes the 11 valid species listed below (modified from NICHOLAS 2007):

Trileptium americanum (Keppner, 1987)

Trileptium australis Nicholas, 2007

Trileptium ayum Inglis, 1964

Trileptium guttatum (Cobb, 1920)

Trileptium iacobinum Wieser, 1959

Trileptium longisetosum Inglis, 1966

Trileptium otti Jensen & Gerlach, 1976

Trileptium parisetum Warwick & Platt, 1973

Trileptium salvadoriense Gerlach, 1955

Trileptium stylum Gerlach, 1956

Trileptium subterraneum (Gerlach, 1952)