Belongs within: Rotaliida.
The Discocylinidae are large orbitoidal foraminiferans known from the Late Palaeocene to Eocene. Representatives have rectangular equatorial chambers arranged in successive annuli with two layers of lateral chamberlets on both sides (BouDagher-Fadel 2008).
<==Discocyclinidae [Orthophragminidae]
|--OrbitoclypeinaeB-F08
| |--Stenocyclina Caudri 1972B-F08
| |--Neodiscocyclina Caudri 1972B-F08
| | `--N. anconensisB-F08
| `--Orbitoclypeus Silvestri 1907LT64
| |--*O. himerensis Silvestri 1907 [incl. Orbitoides (*Exagonocyclina) schopeni Checchia-Rispoli 1907]LT64
| `--O. nummuliticusB-F08
`--DiscocyclininaeB-F08
|--Nemkovella Less 1987B-F08
|--Asterophragmina Rao 1942LT64
| `--*A. pagoda (Rao 1942) [=Pseudophragmina (*Asterophragmina) pagoda]LT64
|--Actinocyclina Gümbel 1870B-F08 [=AktinocyclinaLT64]
| `--*A. radians (d’Archiac 1848) [=Orbitulites radians, Discocyclina (*Aktinocyclina) radians]LT64
|--Hexagonocyclina Caudri 1944B-F08
| `--*H. cristensis (Vaughan 1924) [=Orbitoclypeus cristensis]LT64
|--Pseudophragmina Douvillé 1923 (see below for synonymy)B-F08
| |--*P. floridana (Cushman 1817) [=Orthophragmina floridana]LT64
| |--P. cookei (Vaughan 1936) [=Discocyclina cookei, P. (*Athecocyclina) cookei]LT64
| `--P. perpusilla (Vaughan 1929) [=Discocyclina perpusilla, P. (*Proporocyclina) perpusilla]LT64
`--Discocyclina Gümbel 1870 (see below for synonymy)LT64
|--*D. pratti (Michelin 1846) [=Orbitulites pratti, *Orthophragmina pratti]LT64
|--D. anconensisLT64
|--D. archiaci (Schlumberger 1903)C40, LT64 [=Orthophragmina archiaciLT64, *Eudiscodina archiaciLT64]
|--D. californicaB-F08
|--‘Orthophragmina’ chudeaui Schlumberger 1903 [=*Trybliodiscodina chudeaui]LT64
|--D. discus (Rütimeyer 1850HSA97 [=Orbitolites discusHSA97, *Umbilicodiscodina discusLT64]
|--D. dispansaB-F08
|--‘*Bontourina’ inflata Caudri 1948LT64
|--‘Orbitoides (*Rhipidocyclina)’ multiplicata Gümbel 1870LT64
|--D. nummuliticaC40
|--D. peruvianaB-F08
|--D. pulcraM12
| |--D. p. pulcraM12
| `--D. p. baconicaM12
|--D. ranikotensisB-F08
|--D. sellaB-F08
|--D. sennesiC40
|--D. sheppardiB-F08
`--‘Orthophragmina’ umbilicata Deprat 1905 [=*Nodocyclina umbilicata]LT64
Discocyclina Gümbel 1870 [=Orthophragmina Munier-Chalmas 1891; incl. Bontourina Caudri 1948, Eudiscodina van de Weijden 1940, Exagonocyclina Checchia-Rispoli 1907, Nodocyclina Heim 1908, Rhipidocyclina Gümbel 1870, Trybliodiscodina van der Weijden 1940, Umbilicodiscodina van der Weijden 1940]LT64
Pseudophragmina Douvillé 1923 [incl. Athecocyclina Vaughan & Cole in Cushman 1940, Proporocyclina Vaughan & Cole in Cushman 1940]B-F08
*Type species of generic name indicated
References
[B-F08] BouDagher-Fadel, M. K. 2008. The Cenozoic larger benthic foraminifera: the Palaeogene. Developments in Palaeontology and Stratigraphy 21: 297–418.
[C40] Cushman, J. A. 1940. Foraminifera: Their classification and economic use 3rd ed. Harvard University Press: Cambridge (Massachusetts).
[HSA97] Haig, D. W., M. Smith & M. C. Apthorpe. 1997. Middle Eocene Foraminifera from the type Giralia Calcarenite, Gascoyne Platform, Southern Carnarvon Basin, Western Australia. Alcheringa 21: 229–245.
[LT64] Loeblich, A. R., Jr & H. Tappan. 1964. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 2. The Geological Society of America and The University of Kansas Press.
[M12] McGowran, B. 2012. Cenozoic environmental shifts and foraminiferal evolution. In: Talent, J. A. (ed.) Earth and Life: Global biodiversity, extinction intervals and biogeographic perturbations through time pp. 937–965. Springer.