''Sornayina'' is a genus of

benthic The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from ancient Greek, βένθος (bénthos), meaning "t ...

forams from the Upper Cretaceous (Coniacian) of France included in the

Spirocyclinidae Spirocyclinidae is a family of foraminifera included in the order Loftusiida. Tests are variably discoidal, aggulitinated with calcareous or microgranular cement. Interiors are complex with chambers partially subdivided. Walls and septa are pier ...

. The test is planispirally to slightly asymmetrically coiled, rarely becoming straighter. Microspheric tests reach as much as 3mm in diameter, megalospheric ones are somewhat smaller. Chambers are numerous and are divided into chamberlets by secondary septa. A.R.Loeblich & H.Tappan 1964. Sarcodina, Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2.

References

Loftusiida Prehistoric Foraminifera genera {{foraminifera-stub