Daughter taxa (time control age-window is: 0-800Ma) | ||||
Neogene species | ||||
Tenuitella clemenciae Like T. munda but larger, 5 chambers in final whorl, and a more flattened lip | ||||
Paleogene species | ||||
Tenuitella angustiumbilicata Like Tenuitella gemma but chambers more inflated, especially in edge and umbilical view, and slightly higher trochospiral, and also by typically has 4½ (vs. 5-6) chambers in final whorl. Wall texture is distinctly more pustulose. | ||||
Tenuitella munda Very small, low trochospiral, lobate, 4-4½ chambers in final whorl, sutures depressed. Surface fairly smooth with fine pustules; umbilicus narrow; aperture low arch with thin lip | ||||
Tenuitella gemma Like T. praegemma but test slightly more compressed, less lobate periphery and nearly closed umbilicus; and by absence of secondary apertures or apertural lips. | ||||
Tenuitella praegemma Like T. insolita but aperture is low and extends from near the umbilicus to the spiral side and may be divided in two. | ||||
Tenuitella patefacta Like T. insolita but with a low rather than highly arched, extraumbilical aperture | ||||
Tenuitella insolita Distinguished from other tenuitellids by its highly arched and narrow aperture and smooth test surface. | ||||
Tenuitella sp. Specimens which cannot be assigned to established species |
This genus was revised by Huber and others (2006). As in Fleisher’s (1974) original concept, we include forms with an umbilical aperture as well as those with intraumbilical-extraumbilical and wholly extraumbilical apertures, hence we include Li’s (1987) form-genus Tenuitellinata in synonymy (following Pearson and Wade, 2009; see additional discussion under Tenuitella angustiumbilicata). [Pearson et al. 2018]
The diagnostic features common to all species of Tenuitella are that all have a minute to small, low trochospiral test, globular chambers lacking a distinct carina, and a smooth surface penetrated by extremely small perforations, which are usually obscured by small pustules or crystallites (PI. 39, Figs. 1-4). The subgenus Tenuitella can be easily distinguished from other globorotaliids by its characteristic smooth surface and smaller size. [Kennett & Srinivasan 1983]
Catalog entries: Tenuitella, Praetenuitella, Tenuitellinata
Distinguishing features:
Parent taxon (Globigerinitidae): Microperforate
This taxon: Minute to small, low trochospiral test, with globular chambers. Monolamellar, microperforate wall with a smooth or finely pustulate surface.
Morphology:
Wall type:
Size:
Phylogenetic relations
[Huber et al. 2006]
Important Neogene species referable to Tenuitella are T. clemenciae and T. anfracta, which show morphological continuity as a lineage from the Late Oligocene through the Neogene (Text Fig. 18). T. munda exhibits most of its stratigraphic range within the Paleogene. [Kennett & Srinivasan 1983]
Most likely ancestor: Dipsidripella - at confidence level 2 (out of 5). Data source: Pearson et al. 2018, p. 433..
Likely descendants: Globigerinita;
plot with descendants
Geological Range:
Notes: Upper Eocene-upper Oligocene (Zones E15-O6).
[Huber et al. 2006]
Last occurrence (top): at top of N17b zone (100% up, 5.7Ma, in Messinian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within E15 zone (34.68-35.89Ma, base in Priabonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.16 p.443; Huber et al. 2006 - Eocene Atlas, chap. 16, p. 487
Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs O Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gs O Jenkins, D. G. (1966b). Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. New Zealand Journal of Geology and Geophysics. 8 [1965](6): 1088-1126. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Li, Q. & McGowran, B. (1996). The planktonic foraminifer Cassigerinella winniana (Howe) from southern Australia: Comments on its lineage recognition. Revista Española de Micropaleontología. 28: 97-103. gs Li, Q. (1987). Origin, phylogenetic development and systematic taxonomy of the Tenuitella plexus (Globigerinitidae, Globigerininina). Journal of Foraminiferal Research. 17: 298-320. gs Pearson, P. N. & Wade, B. S. (2009). Taxonomy and stable isotope paleoecology of well-preserved planktonic foraminifera from the uppermost Oligocene of Trinidad. Journal of Foraminiferal Research. 39: 191-217. gs Pearson, P. N., Wade, B. S. & Huber, B. T. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerinitidae (Dipsidripella, Globigerinita, and Tenuitella). In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 16): 429-458. gs O Srinivasan, M. S. & Kennett, J. P. (1981a). A review of Neogene planktonic foraminiferal biostratigraphy: applications in the equatorial and south Pacific. SEPM Special Publication. 395-432. gsReferences:
Tenuitella compiled by the pforams@mikrotax project team viewed: 14-12-2024
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