sigmoilinita sigmoilinita sigmoilinita is a miliolid genus (foraminifera) with an ovate to fusiform test that becomes flattened with growth. chambers are tubular, one-half coil in length, at first added in a sigmoiline (s-shaped) series starting at slightly more than 180° apart. the angle gradually decreasing until the later whorls are planispiral. chambers are numerous, the wall narrow. imperforate, porcelaneous. the aperture at the end of the final chamber. may have a weakly developed tooth sigmoilinitatemporal range: miocene - recent scientific classification (unranked): sar (unranked): rhizaria phylum: foraminifera class: tubothalamea order: miliolida superfamily: miliolacea family: hauerinidae genus: sigmoilinitaseiglie, 1965