Abstract
Unilocular foraminifera are varied and diverse, yet among the least understood gronp of the foraminifera. Part of the problem has been the inadequate number of taxonomic divisions within this varied group. We propose a new taxonomic framework to make the group more useful to taxonomists and stratigraphers alike, and to eventually lead to a better understanding of the group as a whole. Rather than subdividing the unilocular foraminifera into more than one family, we reinstate the family Lagenidae Reuss, 1862, to include all unilocular forms, and recognize three subfamilies. The first subfamily, Lageninae Reuss, 1862, encompasses genera that lack an entosolenian tube, including Lagena Walker and Jacob, and the reinstated Procerolagena Puri. The second subfamily, Ellipsolageninae Silvestri, 1923, accommodates genera with an entosolenian tube at some stage of the life cycle, including Oolina d'Orbigny, Cush
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