Diminovula bilineata is a species of sea snail, a marine gastropod mollusk in the family Ovulidae, the ovulids, cowry allies or false cowries. Description The length of the shell attains 8.5 mm. Distribution This marine species occurs off Madagascar. References Bozzetti L. (2009) Pseudosimnia bilineata (Gastropoda: Ovulidae: Ovulinae) nuova specie dal Madagascar meridionale. Malacologia Mostra Mondiale 64: 17-18 Lorenz, F. and G. Rosenberg. (2020). A new species of Pseudosimnia from Hawaii (Gastropoda: Ovulidae). Acta Conchyliorum. 19: 77-84. Ovulidae Gastropods described in 2009