CATALOG OF ORIGINAL DESCRIPTIONS: Globoturborotalita pseudopraebulloides Olsson & Hemleben, in Spezzaferri et al 2018

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globoturborotalita -> Globoturborotalita pseudopraebulloides
Other pages this level: G. barbula, G. bassriverensis, G. decorata, G. eolabiacrassata, G. paracancellata, G. pseudopraebulloides,

Globoturborotalita pseudopraebulloides

Citation: Globoturborotalita pseudopraebulloides Olsson & Hemleben, in Spezzaferri et al 2018
Rank: Species
Type locality: New Jersey continental slope, western Atlantic Ocean.
Type age: Zone M1
Type sample and level: ODP Site 904A-35-5, 101-106 cm
Holotype Repository: USNM
Type & figured specimens: Holotype (USNM 598586) and paratype (USNM 598587)

Linked specimens: USNM-598587 USNM-598586

Current identification/main database link: Globoturborotalita pseudopraebulloides Olsson and Hemleben, in Spezzaferri et al. 2018


Original Description
Type of wall: Normal perforate, spinose, ruber/sacculifer-type wall texture, an average of 30 pores/50 μm2 test surface area.
Test morphology: Low trochospiral, consisting of 3 whorls, lobulate in outline, chambers globular; in spiral view 4 slightly embracing chambers in ultimate whorl, increasing rapidly in size, sutures depressed, straight; in umbilical view 4 slightly embracing chambers, increasing rapidly in size, sutures depressed, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, a very thin rim may be present; in edge view slightly embracing, initial whorl of chambers slightly elevated.

Size: Maximum diameter of holotype 0.28 mm, minimum diameter 0.26 mm, maximum width 0.20 mm.

Etymology: Named pseudopraebulloides because the name praebulloides was previously used by workers for these forms in the lower Miocene and Oligocene.

Extra details from original publication
DISTINGUISHING FEATURES Identified by its lobulate test with 4 rapidly enlarging chambers in ultimate whorl, large open umbilicus, and umbilical aperture. Globoturborotalita pseudopraebulloides is distinguished from G. paracancellata by having 4 complete chambers in the ultimate whorl, more evolute coiling, and a more open umbilicus. Globigerina leroyi Blow and Banner differs by having a bulloides-type wall texture, 3½ chambers in the ultimate whorl, a slower rate of chamber size increase, and smaller pore diameters. The low porosity ruber/sacculifer-type wall distinguishes G. pseudopraebulloides from other morphologically similar species with bulloides-type wall texture, such as Globigerina archaeobulloides n. sp., and G. bulloides.

DISCUSSION Blow’s species Globigerina praebulloides has been used by many workers to represent forms resembling Globigerina bulloides and considered to be early representatives of the bulloides lineage. SEM images of the holotype of praebulloides reveal a bulloides-type wall texture (Plate 6.8, Figs. 4-6, Chapter 6, this volume), however, the morphology is of a globigerinellid, i.e. evolute coiling and an extraumbilical aperture, and it is regarded as a junior synonym of Globigerinella obesa Bolli, therefore invalidating the name. In contrast, the majority of forms identified as G. praebulloides have a lobulate bulloides test morphology but lack the bulloides-type wall texture, having instead a much lower pore density and a significantly larger pore diameter than in G. bulloides. These wall textures can be attributed to the ruber/sacculifer-type. Globoturborotalita pseudopraebulloides n. sp., described herein is designed to carry this praebulloides ‘ideotype’. Globigerina bulloides s.s. appears in the upper Oligocene (Chapter 6, this volume) and overlaps in range with G. pseudopraebulloides. The bulloides-type wall texture can be traced to the lower Oligocene Zone O1 showing that the two species have separate unrelated lineages (see Chapter 6, this volume for further discussion).

PHYLOGENETIC RELATIONSHIPS: Probably evolved from Globoturborotalita occulusa in the early Oligocene.

STRATIGRAPHIC RANGE Lower Oligocene Zone O2 to middle Miocene Zone M6 (Kennett and Srinivasan, 1983, Spezzaferri, 1994).

GEOGRAPHIC DISTRIBUTION Widespread in low and middle latitudes. Also occurs in the high latitude North Atlantic Ocean (ODP Site 647) during the lower Oligocene (this study).

STABLE ISOTOPE PALEOBIOLOGY: Specimens identified as Globigerina cf. bulloides (here placed in Globoturborotalita pseudopraebulloides n. sp., Pl. 8.13, Figs. 9-11) from the Cipero Formation, Trinidad gave δ18O and δ13C values indicative of a mixed-layer habitat (Pearson and Wade, 2009).

References:

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. 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 8): 231-268. gs :: ::


logo

Globoturborotalita pseudopraebulloides compiled by the pforams@mikrotax project team viewed: 11-8-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=132612 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