CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina archaeobulloides Hemleben & Olsson 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 -> Globigerina -> Globigerina archaeobulloides
Other pages this level: << < G. ampliapertura, G. ampliapertura cancellata, G. anconitana, G. angipora, G. angiporoides, G. angiporoides minima, G. angulata, G. anguliofficinalis, G. antarctica, G. antillensis, G. apertura, G. applanata, G. aptica, G. aquiensis, G. arabica, G. archaeobulloides, G. ariakensis, G. aspensis, G. aspera, G. asperula, G. atlantica, G. atlantis, G. atlantisae, G. aumalensis, G. ayalai, G. azerbaidjanica, G. baconica, G. bacuana, G. bakeri, G. balchanensis, G. baroemoenensis, > >>

Globigerina archaeobulloides

Citation: Globigerina archaeobulloides Hemleben & Olsson 2018
Rank: Species
Type locality: locality AGS 66, Alabama
Type age: Pseudohastigerina naguewichiensis Zone (Zone O1)
Type sample and level: locality AGS 66, 9A-1A, Shubuta Fm., Alabama
Holotype Repository: USNM
Type & figured specimens: Holotype USNM 598581 and paratypes USNM 598582, 598583

Linked specimens: USNM-598581 USNM-598582 USNM-598583

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


Original Description

Type of wall: Normal perforate, spinose, bulloides-type wall structure. Pore concentrations range from 80 to 130 pores/50 mm2 test surface area and pore diameters range from 0.7 mm to 0.9 mm.

Test morphology: Test low to moderately elevated trochospiral consisting of 2½ whorls, lobulate in outline, chambers globular; in spiral view 4-4½ globular, slightly embracing chambers in ultimate whorl, increasing rapidly in size, final chamber varies in size and degree of inflation, sutures moderately depressed and straight; in umbilical view 4-4½ globular, slightly embracing chambers, increasing rapidly in size, sutures moderately depressed, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a broad arch bordered by an imperforate rim; in edge view chambers globular in shape, slightly embracing.


Size: Maximum diameter of holotype 0.20 mm.

Etymology: Named archaeobulloides in recognition of ancestry to Globigerina bulloides.

Extra details from original publication

DISTINGUISHING FEATURES.— Globigerina archaeobulloides n. sp. is distinguished by its small globular test, umbilical aperture and bulloides-type wall. No such form has to our knowledge been described or imaged previously. It differs from G. bulloides in its smaller size, by having up to 4½ chambers in the ultimate whorl and by having some morphotypes with a moderately elevated trochospire. It is distinguished from G. officinalis by lobed peripheral outline, and fully developed bulloides-type wall, especially on the final chamber. It is distinguished from Globoturborotalita ouachitaensis by the bulloides-type wall.

DISCUSSION.— Globigerina archaeobulloides n. sp. traces the development of the bulloides-type wall to the lowermost Oligocene Zone O1. Globigerina officinalis Subbotina has generally been regarded as ancestral to G. bulloides and can be regarded as a transitional species from a subbotinid ancestor (see discussion in Olsson and others, 2006). The wall texture of G. officinalis in the Eocene, however, is not a fully developed bulloides-type wall in that the pore concentration is lower (~50 pores/50 mm2 area); but the species develops a higher pore concentration in the lower Oligocene (72-85 pores/50 mm2 area). Globigerina archaeobulloides is morphologically similar to G. bulloides and has a fully developed bulloides-type wall.

PHYLOGENETIC RELATIONSHIPS.— Globigerina archaeobulloides probably evolved from G. officinalis in Zone O1. It gave rise to Globigerinella obesa in Zone O1 and is thus ancestral to genus Globigerinella. It is also the direct ancestor of Globigerina bulloides, which appeared in Zone O5.

STRATIGRAPHIC RANGE.— Lower Oligocene Zone O1 probably to the upper Oligocene where it gives rise to G. bulloides in Zone O5 (this study).

GEOGRAPHIC DISTRIBUTION.— Probably had a distribution similar to G. bulloides. Modern G. bulloides is a cosmopolitan species but it also occurs in cool upwelling regions.

STABLE ISOTOPE PALEOBIOLOGY.— No data available.

REPOSITORY.— Holotype USNM 598581 and paratypes USNM 598582, 598583 deposited at the Smithsonian Museum of Natural History, Washington, D.C.

References:

Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. 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 6): 179-214. gs


logo

Globigerina archaeobulloides compiled by the pforams@mikrotax project team viewed: 9-4-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=132616 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