Plesiocystiscus leonorae is a species of sea snail, a marine gastropod mollusk, in the family Cystiscidae.MolluscaBase (2018). Plesiocystiscus leonorae Bozzetti, da Costa & T. Cossignani, 2010. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=512190 on 2019-01-05Bozzetti L., Da Costa D. & Cossignani, T. (2010) Quattro nuovi Plesiocystiscus dal Mozambico (Gastropoda: Prosobranchia, Cystiscidae). Malacologia Mostra Mondiale 69:16-18.
Description The length of the shell attains 1.21 mm.
Distribution This marine species occurs off Madagascar.
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