Belongs within: Nodosariana.
Lagena is a Jurassic to Recent genus of mostly unilocular foraminiferans (Loeblich & Tappan 1964).
Characters (Loeblich & Tappan 1964): Test unilocular, rarely two or more chambers; surface variously ornamented; aperture on elongate neck which may have phialine lip, not radiate.
<==Lagena Walker & Jacob in Kanmacher 1798G-B87 (see below for synonymy)
|--*L. sulcata (Walker & Jacob 1798) [=Serpula (Lagena) sulcata, *Ectolagena sulcata]LT64
| |--L. s. sulcataA68
| `--L. s. peculiaris Cushman & McCulloch 1950A68
|--L. acuticosta Reuss 1861A68
|--L. alataH04
|--L. auriculata [incl. L. auriculata var. duplicata]C40
|--L. castrensisH04
|--‘Amphorina’ costai Andersen 1961 [=*A. gracilis Costa 1856 non Lagena gracilis Williamson 1848]LT64
|--L. distomaV64
| |--L. d. distomaA68
| `--L. d. margaritifera Parker & Jones 1865A68
|--L. elegans Gruber 1884G84
|--L. fasciataG84
|--L. flatulenta Loeblich & Tappan 1953A68
|--‘*Lagenula’ floscula de Montfort 1808LT64
|--L. formosaC40
|--L. globosaG84
|--L. gracilis Williamson 1848 [=*Procerolagena gracilis]LT64
|--L. gracillima (Seguenza 1862)A68
|--L. hexagonaC40
|--L. implicata Cushman & McCulloch 1950A68
|--L. interruptaH04
|--L. lineataM08
|--L. marginataG84
|--L. millettiH04
|--L. mollisLT64
|--‘*Capitellina’ multistriata Marsson 1878LT64
|--L. orbignyana [incl. L. orbignyana var. clathrata]C40
|--L. oxystomaM08
|--L. pannosaH04
|--L. paucicostaM08
|--L. perlucida (Montagu 1803)C40, LT64 [=*Vermiculum perlucidumLT64]
|--‘*Phialina’ piriformis Costa 1856LT64
|--L. plumigeraH04
|--‘*Tetragonulina’ prima Seguenza 1862LT64
|--L. radiatomarginataC40
|--L. semistriataH04
|--L. siphoniata Gruber 1884G84
|--L. sphaericaM08
|--L. spiralisC40
|--L. squamosaH04
|--L. striata (d’Orbigny 1839) [=Oolina striata]HSA97
|--L. subterranea Brodsky 1929G86
|--L. torquataH04
|--L. turkomanica Brodsky 1929G86
`--L. wallerianaH04
Lagena Walker & Jacob in Kanmacher 1798G-B87 [=Ectolagena Silvestri 1900LT64; incl. Amphorina d’Orbigny 1849 non Quatrefages 1844LT64, Capitellina Marsson 1878LT64, Lagenula de Montfort 1808 non Lour. 1790 (ICBN)LT64, Phialina Costa 1856LT64, Procerolagena Puri 1954LT64, Tetragonulina Seguenza 1862LT64, Vermiculum Montagu 1803LT64; Lageninae]
*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.
[C40] Cushman, J. A. 1940. Foraminifera: Their classification and economic use 3rd ed. Harvard University Press: Cambridge (Massachusetts).
[G-B87] Gawor-Biedowa, E. 1987. New benthic foraminifers from the Late Cretaceous of Poland. Acta Palaeontologica Polonica 32 (1–2): 49–72.
[G86] Golemansky, V. G. 1986. Rhizopoda: Foraminiferida. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 17–20. E. J. Brill/Dr W. Backhuys: Leiden.
[G84] Gruber, A. 1884. Die Protozoen des Hafens von Genua. Verhandlungen der Kaiserlichen Leopoldinisch-Carolinischen Deutschen Akademie der Naturforscher [Nova Acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum] 46 (4): 473–539, pls 7–11.
[H04] Haeckel, E. 1899–1904. Kunstformen der Natur. Bibliographisches Institut: Leipzig und Wien.
[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.
[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.