Citation: Sphaeroidinella Cushman 1927Rank: genusType species: Sphaeroidina bulloides var. dehiscensTaxonomic discussion: This monotypic genus is justified by preserving common usage and paying tribute to the significance of the development of supplementary apertures as a genus-level character among all other Neogene lineages of planktonic foraminifera. [Brummer & Kucera 2022]
Distinguishing features: Parent taxon (Globigerinidae): Wall spinose, usually with 3½-6 globular chambers in final whorl, trochospiral or planispiral This taxon: Like Sphaeroidinellopsis but with supplementary apertures
NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They are being edited as the site is developed and comments on them are especially welcome.
Emended description: Morphology: The genus Sphaeroidinella is distinguished from Sphaeroidinellopsis by the presence of supplementary apertures on the spiral side. [Kennett & Srinivasan 1983] Wall type: Size: 0
Biogeography and Palaeobiology
Similar species Geographic distribution Isotope paleobiology Phylogenetic relationsSphaeroidinella evolved from Sphaeroidinellopsis in the earliest Pliocene by developing supplementary apertures and larger test size (Text Fig. 23). The initial evolutionary appearance of Sphaeroidinella marks the base of Zone N19 (Early Pliocene). [Kennett & Srinivasan 1983]
Most likely ancestor:Sphaeroidinellopsis - at confidence level 5 (out of 5). Data source: Kennett & Srinivasan 1983.
Geological Range: Last occurrence (top): Extant. Data source: Total of range of species in this database First occurrence (base): near top of Messinian Stage (88% up, 5.6Ma, in Messinian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested