The Nonionacea is a superfamily of protists within the foraminiferal order Rotaliida that unites the families Nonionidae, Spirotectintidae, and Almaenidae; characterized by tests commonly of perforate hyaline oblique calcite, usually appearing optically granular.
References
- Alfred R. Loeblich Jr and HelenTappan,1988. Forminiferal Genera and their Classification. [1]
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