CATALOG OF ORIGINAL DESCRIPTIONS: Globorotaloides quadrocameratus Olsson, Pearson & Huber 2006

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 -> Globorotaloides -> Globorotaloides quadrocameratus
Other pages this level: G. atlanticus, G. carcoselleensis, G. eovariabilis, G. falconarae, G. indigena anavenezuelana, G. indigena redissimilis, G. parvulus anasuteri, G. parvulus lateraliaperturus, G. quadrocameratus, G. suteri, G. suteri relizensis, G. trema, G. variabilis,

Globorotaloides quadrocameratus

Citation: Globorotaloides quadrocameratus Olsson, Pearson & Huber 2006
Rank: Species
Type species: Named after the four chambers in the final whorl, by which it is distinguished from Globorotaloides eovariabilis n. sp.
Type locality: Tampico, Mexico
Type age: Zone E11; Eocene
Type sample and level: Guayabal Formation
Holotype Repository: Washington; USNM
Type & figured specimens: PLATE 5.5, FIGURES 1-16; Holotype (USNM 521865) and paratype (USNM 521866) deposited at the Smithsonian Museum of Natural History, Washington, D.C.

Linked specimens: USNM-521865 USNM-521866

Current identification/main database link: Globorotaloides quadrocameratus Olsson, Pearson & Huber 2006


Original Description
Type of wall: Normal perforate, coarsely cancellate, spinose, ruber/sacculifer-type wall structure. Test morphology: Test very low trochospiral, lobulate in outline, chambers globular; in spiral view 4-4½ globular, slightly embracing chambers in ultimate whorl, increasing rapidly in size, ultimate chamber may be reduced in size, sutures moderately depressed, straight; in umbilical view 4 globular, slightly embracing chambers, increasing rapidly in size, ultimate chamber often reduced and directed towards and over the umbilicus, sutures moderately depressed, straight, umbilicus small and often covered by ultimate chamber, aperture umbilical in adult specimens, a low opening bordered by narrow thickened lip; in edge view chambers globular in shape, slightly embracing.

Size: Size: Maximum diameter of holotype 0.27 mm, minimum diameter 0.25 mm, maximum width 0.13 mm.

Extra details from original publication
Distinguishing Features.—Globorotaloides quadrocameratus n. sp. is characterized by its small, lobulate test, 4-41/2 chambers in the ultimate whorl, the umbilically directed ultimate chamber, and the sacculifer-type wall texture.

Discussion.— Globorotaloides quadrocameratus n. sp. appears to be the first species of Globorotaloides. It may have evolved in the basal Eocene from a parasubbotinid ancestor by flattening of the coil and developing a coarsely cancellate test, which is typical of the genus. The species is more typical of low latitude localities than later species of Globorotaloides, but also occurs in mid and higher latitudes.

Phylogenetic Relationships.— The origin of Globorotaloides quadrocameratus is unknown. It is possibly derived from Parasubbotina varianta with which it shares some morphologic features, principally in the sacculifer wall texture on parts of the test, rapidly enlarging chambers, and low trochospiral test. It also gave rise to Globorotaloides eovariablis n. sp.

Stratigraphic Range.— E2 to E16.

Geographic Distribution.— This species is known from tropical and high latitude sites.

Stable Isotope Paleobiology.— No data available.

References:

Coxall, H. K. & Spezzaferri, S. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Catapsydrax, Globorotaloides, and Protentelloides. 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 4): 79-124. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. 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 5): 67-110. gs


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Globorotaloides quadrocameratus compiled by the pforams@mikrotax project team viewed: 31-3-2020

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