MonostiliferaMonostilifera is a suborder of nemertean worms belonging to the class Hoplonemertea, a class of worms characterized by the presence of a peculiar armature of spines or plates in their proboscis.Families Acteonemertidae Amphiporidae Carcinonemertidae Cratenemertidae Prosorhochmidae TetrastemmatidaeGenus : Quasitetrastemma Chernyshev, 2004