Sigmoilinita

Sigmoilinita; Temporal range: Miocene - Recent
Scientific classification
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Foraminifera
Class:	Tubothalamea
Order:	Miliolida
Superfamily:	Miliolacea
Family:	Hauerinidae
Genus:	Sigmoilinita; Seiglie, 1965

Sigmoilinita is a miliolid genus (Foraminifera) with an ovate to fusuform 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

References

Alfred R. Loeblich Jr and Helen Tappan,1988. Forminiferal Genera and their Classification. E-book

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