Study of the type material of Conorbina marginata, the type species of Conorbina, reveals the presence of a small open umbilicus and of umbilical folia associated with the aperture. The observation of these characters forces a reclassification of the genus into the Rosalinidae and the lapse into synonymy of the family taxon Conorbinidae. The dissolution of the Conorbinidae and the extension of the fossil record of the Rosalinidae into the Lower Cretaceous further complicates any attempt towards reconstructing the phylogeny of the rotaline Foraminifera.

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