Rego & Pavanelli, 1987 comprises only one species,
Rego & Pavanelli, 1987; characterized by these authors on the basis
of absence of vitelline follicles. In this study, the presence of cortical
vitelline follicles in this species is confirmed after de Chambrier and
Vaucher (1999); the redescription was performed for the first time based
on type and new material collected from Argentina, Brazil and Paraguay.
is confirmed as a valid genus, and compared to other genera of the subfamily
is characterized by: (1) the presence of gland cells posteromedially to
suckers; (2) the particular distribution of vitelline follicles, forming
lateral arches; (3) uterine primordium cortical, growing into medulla and
forming a sac-like uterus; (4) eggs, irregularly oval, outer envelop with
excrescences and two digitate lappets in one of the poles.