Morphological classification of foraminifera
established by Valeria I. Mikhalevich et al.
Zoological Institute. Russian Academy of Sciences. Universitetskaja nab. 1, 199034 St-Petersburg, Russia
|Astrorhizata Mikhalevich, 1980
Subclasses: Astrorhizana Saidova, 1981 and Lagynana Mikhalevich, 1980
"Tests primitive unilocular, sometimes passing to pseudo- multichambered ones with sub-sphaerical, elongated or very often irregular forms, agglutinated or microgranular wall, often of considerable thickness, aperture simple or sometimes not developed."
Spirillinata Maslakova, 1990
Subclasses: Ammodiscana Mikhalevich, 1980 and Spirillinana Maslakova, 1990
"Tests pseudotwochambered with a lang tubular second chamber or derived from them multichambered, often with a preserved initial tubular part. The higher representatives may have additional apertures and, sometimes, a primitive canal system."
Miliolata Saidova, 1981
Subclasses: Miliamminana Mikhalevich, 1980 and Miliolana Saidova, 1981
"Shells mostly multi-chambered, predominantly with tubular chambers coiled in one of the special miliolide arrangements, usually two, rarely three per volution; sometimes planispiral with more than three broad chambers per whorl in the Order Soritida. The flexostyle is preserved in many representatives. Aperture at the end of the chamber may be simple or complicated by an inner tooth or a special structure. It may also be cribrate. Additional apertures only as an exception; integrative systems presented only by stolons."
Nodosariata Mikhalevich, 1992
Subclasses: Hormosinana Mikhalevich, 1992 and Nodosariana Mikhalevich, 1980
"Shells predominantly multichambered with the prevalence of elongated, mostly monoaxial (uni-, bi- or triserial) arrangements, sometimes in polymorphinoid or plectofrondicularian arrangements, more rarely planispiral (usually involute). Aperture terminal even in coiled forms, simple or complicated: radial, hooded, fissure-like, rarely cribrate. An entosolenian tube may be present in each of these apertural types (except in the cribrate one), only rarely forming inter-connected systems. No additional apertures or canal system are present."
Rotaliata Mikhalevich, 1980
Subclasses: Rotaliana Mikhalevich, 1980, Textulariana Mikhalevich, 1980 and Globigerinana Mikhalevich, 1980
Tests exclusively multi-chambered, mostly planispiral or trochospiral or derived from both of them. Aperture commonly at the base of the apertural face, at least in the earlier stages, single or multiple, may be cribrate, simple or complex with well- developed and diversified inner plates, grooves, valves, often forming inter-connected systems. Additional apertures present, stolons and canal systems well developed. The subclass Rotaliana comprises the genera with calcareous testwalls, the subclass Textulariana those with agglutinated testwalls.