Work found, with species-group names introduced therein:
Faber, M. J. 2005c. A new species of Gibberula Swainson, 1840 (Gastropoda: Cystiscidae) from Venezuela. Miscellanea Malacologica 1 101-102. [Stated date: 28 Dec 2005; true date: pre 17 Jan.] Gibberula agricola