Belongs within: Nodosariana.
Marginulina is a Triassic to Recent genus of foraminiferans with an initially curved test (Loeblich & Tappan 1964).
Characters (Loeblich & Tappan 1964): Early portion slightly coiled, not completely enrolled, later rectilinear; sutures oblique, especially in early portion; aperture of dorsal angle, somewhat produced.
<==Marginulina d’Orbigny 1826 (see below for synonymy)LT64
|--*M. raphanus d’Orbigny 1826 [=*Ellipsomarginulina raphanus]LT64
|--M. aculeata [=Nodosaria aculeata; incl. Dentalina floscula, Marginulina hirsuta]C40
|--M. bacheii Bailey 1851A68
|--M. bullataC40
|--M. cephalotesBL79
|--‘Nautilus (Orthoceras)’ costatus Batsch 1791 [=*Margulinella costata]LT64
|--‘*Enantiomarginulina’ dorbignyi Marie 1941LT64
|--M. dubiaC40
|--M. glabra d’Orbigny 1826LT64
|--‘*Enantioamphicoryna’ obesa Marie 1956LT64
|--M. plummeraeM08
|--M. procera (Stache 1865) [=*Hemicristellaria procera]LT64
|--M. siliculaM08
`--‘*Buccinina’ subrecta Costa 1861LT64
Marginulina d’Orbigny 1826 [=Ellipsomarginulina Silvestri 1963; incl. Buccinina Costa 1861, Enantioamphicoryna Marie 1956, Enantiomarginulina Marie 1941, Hemicristellaria Stache 1865, Marginulinella Wedekind 1937; Marginulinidae]LT64
*Type species of generic name indicated
References
[A68] Albani, A. D. 1968. Recent Foraminiferida of the central coast of New South Wales. AMSA Handbook 1: 1–37.
[BL79] Basov, V. A., B. G. Lopatin, I. S. Gramberg, A. I. Danjushevskaya, V. Ya. Kaban’kov, V. M. Lazurkin & D. K. Patrunov. 1979. Lower Cretaceous lithostratigraphy near Galicia Bank. Initial Reports of the Deep Sea Drilling Project 47: 683–717.
[C40] Cushman, J. A. 1940. Foraminifera: Their classification and economic use 3rd ed. Harvard University Press: Cambridge (Massachusetts).
[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.
[M08] McMillan, I. K. 2008. Reappraisal of foraminiferal assemblages of the Santonian–Campanian Mzamba Formation type section, and their correlation with the stratigraphic succession of the KwaZulu Basin. African Natural History 4: 25–34.