Spirocyclinidae

Spirocyclinidae is a family of foraminifera included in the order Loftusiida.

Spirocyclinidae Temporal range: Early Jurassic – Eocene
Anchispirocyclina henbesti
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Retaria
Subphylum:	Foraminifera
Class:	Rotaliata
Subclass:	Textulariia
Order:	Loftusiida
Family:	Spirocyclinidae Munier-Chalmas, 1887
Genera
See text

Tests are variably discoidal, aggulitinated with calcareous or microgranular cement. Interiors are complex with chambers partially subdivided. Walls and septa are pierced with ramifying and anastomosing channels. The family presently includes the following genera; Spirocyclina, Anchispirocyclina, Haurania, Martiguesia, Pseudospirocyclina, Qataria, Reissella, Saudia, Sornayina, Spiraloconulus, Streptocyclammina, Timidonella, and Vania.

Previous the subfamily Spyrocylininae according to Loeblich and Tappan, 1964 in the Treatise on Invertebrate Paleontology which then included Spriocyclina, Anchispirocyclina, Orbitammiina, and Sornayina. Orbitammina has been moved to the textulariid Orbitopsellidae where it rests along with Orbitopsella, Cyclorbitopsella, and Labyrinthina.

Foraminifera, to which the Spirocyclinidae belong are characterized by reticulate pseudopoda, and often produce intricate shells, or tests. They are referred to as Sarcodina in older texts, and more recently as Retaria.

References

• Alfred R. Loeblich, jr & Helen Tappan, 1964, Sarcodunam chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2. Geological Society of America and University of Kansas Press.
• Spirocyclinidae, Loeblich & Tappan 1988, Foraminiferal general and their classification, in GSI e-book.
• Foraminifera morphological classification [1]