pforams@mikrotax - Tenuitellita iota pforams@mikrotax - Tenuitellita iota

Tenuitellita iota

Classification: pf_cenozoic -> Globigerinitidae -> Tenuitellita -> Tenuitellita iota
Sister taxa: T. iota, T. fleisheri, T. parkerae


Citation: Tenuitellita iota (Parker, 1962)
Rank: species
Basionym: Globigerinita iota
Taxonomic discussion: Described in detail by Parker (1962), the subsequent application of the species concept has been often hampered by the impression of the obligatory presence of a complex bulla, as seen on the type and two other specimens (plate 10, figs. 26– 28 of Parker, 1962). This character refers to only one type within the species and Parker (1962) explicitly states that the species also contains a type where the bulla is rare, as exemplified by her specimen pictured on plate 20, fig. 29. In our experience, most specimens in the plankton have no terminal bulla but are easily distinguished from the superficially similar G. glutinata by their consistently umbilical–extraumbilical aperture and a distinctly smooth wall texture with few large pustules concentrated in the umbilical region, such as in the specimens figured as T. iota by Brummer (1988a) and Morard et al. (2019b). [Brummer & Kucera 2022]

Catalog entries: Globigerinita iota, Globorotalia seigliei, Globigerina atlantisae

Type images:

Distinguishing features:
Parent taxon (Tenuitellita):
This taxon: Four chambers

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.



Coiling direction (in extant population): mixed

Wall type:


Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Extraumbilical-peripheral
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Bulla
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-4.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

In modern oceans an abundant, cold water, species [SCOR WG138]

Map of distribution from ForCenS database

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (SCOR WG138)
First occurrence (base): within No known fossil record modern (0-0Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:


Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs

Brummer, G. J. A. (1988a). Comparative ontogeny of modern microperforate planktonic foraminifers. In, Brummer, G. J. A. and Kroon, D. (ed.) Planktonic foraminifers as tracers of ocean-climate history. Free University Press, Amsterdam, 77-129. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gs

Li, Q. (1987). Origin, phylogenetic development and systematic taxonomy of the Tenuitella plexus (Globigerinitidae, Globigerininina). Journal of Foraminiferal Research. 17: 298-320. gs

Meilland, J., Cornuault, P., Morard, Raphaël, Brummer, Geert-J. A. & Kucera, M. (2022). Identification guide to extant planktonic foraminifera. Part 1: Family Candeinidae and genera Berggrenia, Bolivina, Dentigloborotalia, and Neogallitellia. ICES Identification Leaflets for Plankton. 196: 1-22. gs

Morard, R., Vollmar, N. M., Greco, M. & Kucera, M (2019b). Unassigned diversity of planktonic foraminifera from environmental sequencing revealed as known but neglected species. PLoS One. 14: 1-18. gs

Parker, F. L. (1962). Planktonic foraminiferal species in Pacific sediments. Micropaleontology. 8(2): 219-254. gs

Siccha, M. & Kucera, M. (2017). ForCenS, a curated database of planktonic foraminifera census counts in marine surface sediment samples. Scientific Data. 4(1): 1-12. gs


Tenuitellita iota compiled by the pforams@mikrotax project team viewed: 30-11-2023

Taxon Search:
Advanced Search

Short stables page link: Go to to create a permanent copy of this page - citation notes

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!