Turborotalia altispiroides


Classification: pf_cenozoic -> Globanomalinidae -> Turborotalia -> Turborotalia altispiroides
Sister taxa: T. cunialensis, T. cocoaensis, T. cerroazulensis, T. pomeroli, T. frontosa ⟩⟨ T. ampliapertura, T. increbescens, T. altispiroides, T. possagnoensis, T. sp.

Taxonomy

Citation: Turborotalia altispiroides Bermudez 1961
Rank: Species
Basionym: Turborotalia altispiroides
Synonyms:
Taxonomic discussion: This taxon has rarely been identified, despite being a distinctive and stratigraphically useful form. We illustrate the holotype in SEM for the first time (Pl.15.1, Figs. 1-3). It is a large, high-spired species that, as originally noted by Bermúdez (1961), is reminiscent in general shape of Neogene Dentoglobigerina altispira (Cushman and Jarvis) although it lacks the distinct umbilical teeth of that taxon.
We have observed extreme variants in ODP Site 865 (equatorial mid Pacific Ocean – see Pl. 15.1, Fig. 11). Morphometric studies (P .N. Pearson, unpublished data) show that it is a separate species from T. pomeroli, although the two intergrade in the lower part of the range of altispiroides. Its extinction in Zone E14 may prove to be a useful marker horizon, although it needs further documentation. [Pearson et al. 2006]

Catalog entries: Turborotalia altispiroides

Type images:

Distinguishing features: Like T. pomeroli but higher spire, dorso-ventrally extended chambers, usually more chambers in the final whorl, and more umbilically-centered aperture.

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


Wall type: Smooth with pustules or weakly
cancellate, especially on earlier chambers; tendency to defoliate. [Pearson et al. 2006]

Morphology: Highly trochospiral, globular, spherical morphology with 4½ to 6 chambers in the final whorl and up to 3½ whorls in the test; chambers moderately inflated, radially compressed but elongate in a dorso-ventral direction, increasing slowly in size, with final one or two chambers commonly flattened, reduced in size and added high in the spiral and arching over umbilicus; dorsal sutures slightly curved, depressed. Aperture a broad arch overhanging umbilicus, with narrow imperforate lip; umbilicus varying from narrow in specimens with 4½ chambers in the final whorl to broad and deep in specimens with more; ventral sutures slightly curved, depressed; weak tendency for sinistral coiling. [Pearson et al. 2006]

Size: Holotype length 0.51 mm, breadth 0.42 mm, height 0.46 mm. [Pearson et al. 2006]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Moderate-highperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Moderately pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Probably cosmopolitan. [Pearson et al. 2006]
Aze et al. 2011 summary: Cosmopolitan; based on Pearson et al. (2006)

Isotope paleobiology: Oxygen and carbon isotopic values are similar to T. pomeroli and intermediate in comparison to other species (P .N. Pearson, unpublished data). [Pearson et al. 2006]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on δ13C lighter than species with symbionts; also with relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson et al. (2001a)

Phylogenetic relations: Evolved from Turborotalia pomeroli and became extinct in the middle Eocene. [Pearson et al. 2006]

Most likely ancestor: Turborotalia pomeroli - at confidence level 4 (out of 5). Data source: Pearson et al. (2006), fig 15.1.

Biostratigraphic distribution

Geological Range:
Notes: Middle Eocene, upper Zone E11 to lower Zone E14. [Pearson et al. 2006]
Last occurrence (top): in lower part of E14 zone (30% up, 37.4Ma, in Priabonian stage). Data source: Pearson et al. (2006), fig. 15.1
First occurrence (base): in upper part of E11 zone (80% up, 40.7Ma, in Lutetian stage). Data source: Pearson et al. (2006), fig. 15.1

Plot of occurrence data:

Primary source for this page: Pearson et al. 2006 - Eocene Atlas, chap. 15, p. 438

References:

Beckmann, J. P. (1953). Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados, Kl. Antillen. Eclogae Geologicae Helvetiae. 46(2): 301-412. gs V O

Bermudez, P. J. (1937). Nuevas especies de Foraminiferos del Eoceno de Cuba. Memorias de la Sociedad Cubana de Historia Natural. 11: +143-+. gs

Bermudez, P. J. (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Editorial Sucre, Caracas. 1119-1393. gs

Bolli, H. M. (1957a). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 155-172. gs V O

Pearson, P. N., Premec-Fucek, V. & Premoli Silva, I. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Turborotalia. 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 15): 433-460. gs V O


logo

Turborotalia altispiroides compiled by the pforams@mikrotax project team viewed: 24-11-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=100310 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics