Cita and others (1965) suggest that T. subsacculifer evolved into T. sacculifer in the middle Miocene, acquiring specialized characters such as the well-developed sac-like last chamber. However, additional material is needed to prove this phylogenetic relationship. [Spezzaferri et al. 2018]
Catalog entries: Globigerinoides sacculifera subsacculifera
Type images:Distinguishing features:
Parent taxon (Trilobatus): Supplementary apertures and cancellate wall.
This taxon: Like T. sacculifer but last chamber only weakly sac-like chamber; test generally smaller; tande primary aperture is a lower and smaller
The last slightly pronounced sac-like chamber is similar to, although less-developed than that of T. sacculifer. Trilobatus subsacculifer is generally smaller that T. sacculifer (maximum length of holotype 1 mm). The primary aperture is a lower and smaller arch than in T. sacculifer. It differs from T. immaturus and T. trilobus by a slightly sac-like last chamber. [Spezzaferri et al. 2018]
Diagnostic characters:
Morphology:
Wall type:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | Low-moderate | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Sutural |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Cancellate | shell porosity: | Macroperforate: >2.5µm |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 4-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Most likely ancestor: Trilobatus trilobus - at confidence level 3 (out of 5). Data source: .
Likely descendants: Trilobatus sacculifer;
plot with descendants
Geological Range:
Notes: Trilobatus subsacculifer ranges from just above the Miocene Subzone M1a/M1b boundary (Spezzaferri, 1994) to the Tortonian, upper Miocene Zone M13 (Cita and others, 1965). Additional and comparative material is needed to prove its presence in sediments younger than Zone M13. [Spezzaferri et al. 2018]
Last occurrence (top): within M13 zone (6.14-9.83Ma, top in Messinian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within M1b subzone (21.12-22.44Ma, base in Aquitanian stage). Data source: Spezzaferri et al. 2018
Plot of occurrence data:
Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.298
Bicchi, E., Ferrero, E. & Gonera, M. (2003). Bicchi, E., Ferrero, E. & Gonera, M. (2003). Palaeoclimatic interpretation based on Middle Miocene planktonic foraminifera: the Silesia Basin (Paratethys) and Monferrato (Tethys) records. Palaeogeography Palaeoclimatology Palaeoecology. 196: 265-303. Palaeogeography Palaeoclimatology Palaeoecology. 196: 265-303. gs Bizon, G. & Bizon, J. -J. (1972). Bizon, G. & Bizon, J. -J. (1972). Atlas des Pricipaux Foraminiferes Planctoniques du Bassin Mediterraneen Oligocene a Quaternaire. Technip, France. -. Technip, France. -. gs Brady, H. B. (1877). Brady, H. B. (1877). Supplementary note on the foraminifera of the Chalk (?) of the New Britain group. Geological Magazine. 4(12): 534-536. Geological Magazine. 4(12): 534-536. gs Cita, M. B., Premoli Silva, I. & Rossi, R. C. (1965). Cita, M. B., Premoli Silva, I. & Rossi, R. C. (1965). Foraminiferi planctonici del Tortoniano- tipo. Rivista Italiana di Paleontologia e Stratigrafia. 71: 271-308. Rivista Italiana di Paleontologia e Stratigrafia. 71: 271-308. gs Spezzaferri, S. (1994). Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. Palaeontographia Italica. 81: 1-187. gs Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018c). Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. 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 9): 269-306. 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 9): 269-306. gs References:
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Trilobatus subsacculifer compiled by the pforams@mikrotax project team viewed: 12-6-2025
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