pforams@mikrotax - Trilobatus subsacculifer

pforams@mikrotax - Trilobatus subsacculifer pforams@mikrotax - Trilobatus subsacculifer

Trilobatus subsacculifer

Classification: pf_cenozoic -> Globigerinidae -> Trilobatus -> Trilobatus subsacculifer
Sister taxa: T. sacculifer, T. quadrilobatus, T. immaturus, T. trilobus ⟩⟨ T. bisphericus, T. sicanus ⟩⟨ T. altospiralis, T. praeimmaturus, T. primordius, T. subsacculifer, T. sp.

Olig Atlas pl09-13 07-9.JPG
Olig Atlas pl09-13 17-19.JPG
Olig Atlas pl09-13 04-6.JPG
Olig Atlas pl09-13 10-12.JPG
Olig Atlas pl09-13 13-15.JPG

Taxonomy

Citation: Trilobatus subsacculifer (Cita, Premoli Silva,&Rossi, 1965)

Taxonomic rank: species

Basionym: Globigerinoides sacculifera subsacculifera Cita, Premoli Silva and Rossi, 1965

Synonyms:

Globigerinoides sacculifera subsacculifera Cita, Premoli Silva and Rossi, 1965:268, pl. 31, fig. 3a-c [Tortonian, Tortona, Piedmont, northern Italy].—Bizon and Bizon, 1972:242, figs. 1-4 [lower Miocene G. trilobus Zone, Epirus, northwestern Greece].
Globigerinoides sacculifer (Brady).—Chaisson and Leckie 1993:158, pl. 2, fig. 16 [lower Miocene Subzone M1b, DSDP Site 806B, Ontong Java Plateau, western equatorial Pacific Ocean]. [Not Brady, 1877.]
Globigerinoides subsacculifer Cita, Premoli Silva and Rossi.—Spezzaferri, 1994:38, pl. 13, figs. 4a-c [lower Miocene Zones N5-N6, DSDP Hole 548A, North Atlantic Ocean]; figs. 5a-c [lower Miocene Zone N5, DSDP Site 151, Gulf of Mexico].

Taxonomic discussion:

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:

holotype: G. sacculifera subsacculifera
holotype: G. sacculifera subsacculifera
holotype: G. sacculifera subsacculifera
paratype: G. sacculifera subsacculifera
paratype: G. sacculifera subsacculifera
paratype: G. sacculifera subsacculifera
x: G. sacculifera subsacculifera

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

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.

Description

Diagnostic characters:

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]

Morphology:

Low trochospiral, consisting of 3 whorls, subtriangular to triangular and lobate in outline, 4 subspherical to reniform chambers in the last whorl, increasing slowly in size. The last chamber is slightly sac-like and may be smaller than the previous ones. Sutures are depressed, slightly curved on the spiral side and straight on the umbilical side. Umbilicus narrow and slightly depressed. Primary aperture a low umbilical arch, sometimes bordered by a thin rim. One to two supplementary small low arched apertures are present along the sutures. [Spezzaferri et al. 2018]

Wall type:

Olig Atlas pl09-13 20.JPG
Olig Atlas pl09-13 16.JPG

Normal perforate, spinose, sacculifer-type wall.

Size:

Maximum diameter of holotype 0.25 mm. [Spezzaferri et al. 2018]

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

Biogeography and Palaeobiology

Geographic distribution

This species is most abundant at middle and low latitudes (Spezzaferri, 1994). [Spezzaferri et al. 2018]

Isotope paleobiology

A well constrained stable isotope paleobiology is presently not available. However, the few data reported in Bicchi and others (2003) suggest that it was a mixed-layer dweller. [Spezzaferri et al. 2018]

Phylogenetic relations

Trilobatus subsacculifer evolved from T. trilobus just above the Subzone M1a/M1b boundary. [Spezzaferri et al. 2018]

Most likely ancestor: Trilobatus trilobus - at confidence level 3 (out of 5). Data source: .
Likely descendants: Trilobatus sacculifer; plot with descendants

Biostratigraphic distribution

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:

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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Trilobatus

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.298

References:

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

Trilobatus subsacculifer compiled by the pforams@mikrotax project team viewed: 12-6-2025

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104369 Go to Archive.is to create a permanent copy of this page - citation notes

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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