Gw mau tau Spesies yang diketahui: dari Orthonectida

Ciliocincta akkeshiensis Tajika, 1979 – Hokkaido, Japan; in flatworms (Turbellaria)

Ciliocincta julini (Caullery and Mesnil, 1899) – E North Atlantic, in polychaetes

Ciliocincta sabellariae Kozloff, 1965 – San Juan Islands, WA (USA); in polychaete (Neosabellaria cementarium)

Intoshia leptoplanae Giard, 1877 – E North Atlantic, in flatworms (Leptoplana)

Intoshia linei Giard, 1877 – E North Atlantic, in nemertines (Lineus) = Rhopalura linei

Intoshia major Shtein, 1953 – Arctic Ocean; in gastropods (Lepeta, Natica, Solariella) = Rhopalura major

Intoshia metchnikovi (Caullery & Mesnil, 1899) – E North Atlantic, in polychaetes and nemertines

Intoshia paraphanostomae (Westblad, 1942) – E North Atlantic, in flatworms (Acoela)

Intoshia variabili (Alexandrov & Sljusarev, 1992) – Arctic Ocean, in flatworms (Macrorhynchus)

Rhopalura elongata Shtein, 1953 – Arctic Ocean, in bivalves (Astarte)

Rhopalura granosa Atkins, 1933 – E North Atlantic, in bivalves (Pododesmus)

Rhopalura intoshi Metchnikoff – Mediterranean, in nemertines

Rhopalura litoralis Shtein, 1953 – Arctic Ocean, in gastropods (Lepeta, Natica, Solariella)

Rhopalura murmanica Shtein, 1953 – Arctic Ocean, in gastropods (Rissoa, Columbella)

Rhopalura ophiocomae Giard, 1877 – E North Atlantic, in ophiuroids (usually Amphipholis)

Rhopalura pelseneeri Caullery & Mesnil, 1901 – E North Atlantic, polychaetes and nemertines

Rhopalura philinae Lang, 1954 – E North Atlantic, in gastropods

Rhopalura pterocirri de Saint-Joseph, 1896 – E North Atlantic, in polychaetes

Stoecharthrum giardi Caullery & Mesnil, 1899 – E North Atlantic, in polychaetes

Stoecharthrum monnati Kozloff, 1993 – E North Atlantic, in molluscs

Pelmatosphaera polycirri Caullery and Mesnil, 1904 – E North Atlantic, in polychaetes and nemertines