Tetrastemma
Tetrastemma
Biota | Animalia | Nemertea | Hoplonemertea | Monostilifera | Eumonostilifera | Amphiporina | Tetrastemmatidae | Tetrastemma
|  |  | Hubrecht, 1879 | Brinkmann, 1917 | Chernyshev, 2003 | Chernyshev & Polyakova, 2019 | Hubrecht, 1879 | Ehrenberg, 1831