This species was discussed by Pearson and others (2006b). Like T. ampliapertura it survived the extinction of the rest of the genus in the uppermost Eocene. It is rarer and more sporadic than T. ampliapertura in the Oligocene (e.g., Leckie and others, 1993). [Pearson et al. 2018]
This morphospecies is intermediate in morphology between T. pomeroli and T. ampliapertura and also intergrades with T. cerroazulensis in the lower part of the upper Eocene. The holotype is illustrated in SEM here for the first time (Pl.15.6, Figs. 1-3). Blow and Banner (1962) and Blow (1969, 1979) have remarked upon the tendency of the aperture to become more umbilical in position, producing transitional forms toward the ampliapertura morphospecies. Both T. increbescens and T. ampliapertura survived the extinction of the rest of the genus in the uppermost Eocene.
Globigerina tumbeli Khalilov was viewed by W. A. Berggren (pers. comm.) as part of this study and is placed in questionable synonymy. [Pearson et al. 2006]
Catalog entries: Globigerina increbescens, Globigerina tumbili
Type images:Distinguishing features:
Parent taxon (Turborotalia): Trochospiral with umbilical-extraumbilical aperture.
Wall smooth pustulose, can be weakly cancellate, & may defoliate.
This taxon: Like T. pomeroli but more compact morphology.
Morphology:
Wall type:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Globular | coiling axis: | Moderate-high | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Subtriangular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Weakly depressed | umb depth: | Deep | wall texture: | Coarsely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 3.5-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution
Isotope paleobiology
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on _13C lighter than species with symbionts; also with relatively light _18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (2006)
Phylogenetic relations
Most likely ancestor: Turborotalia pomeroli - at confidence level 4 (out of 5). Data source: Pearson et al. (2006), fig 15.1.
Geological Range:
Notes: Middle Eocene Zone E13 (Postuma, 1971) to lower part of lower Oligocene Zone O2 (Pearson and Chaisson, 1997). Blow (1979, fig. 53, p. 311) and Leckie and others (1993, p. 118) recorded the highest occurrence as slightly below the topmost Pseudohastigerina and hence in the top of Zone O1; Pearson and Chaisson (1997) recorded it extending to just within (the lowermost of 8 studied samples) Zone O2. [Pearson et al. 2018]
Last occurrence (top): at top of O1 zone (100% up, 32.1Ma, in Rupelian stage). Data source: Pearson et al. (2018), fig. 14.1
First occurrence (base): in mid part of E13 zone (50% up, 39Ma, in Bartonian stage). Data source: Pearson et al. (2006), fig. 15.1
Plot of occurrence data:
Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.14 p.411; Pearson et al. 2006 - Eocene Atlas, chap. 15, p. 453
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Turborotalia increbescens compiled by the pforams@mikrotax project team viewed: 14-11-2024
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