CATALOG OF ORIGINAL DESCRIPTIONS: Globorotaloides trema Lipps 1964

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 trema
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 trema

Citation: Globorotaloides trema Lipps 1964
Rank: species
Type age: Miocene
Holotype Repository: Los Angeles; University of California, , USA
Type & figured specimens: Types: Holotype UCLA no. 34740; 100 unfigured paratypes UCLA no. 34741; 10 unfigured paratypes USNM no. 641568; all from sample 18, Luisian.

Linked specimens: USNM-641568

Current identification/main database link: Not linked - add to pf_cenozoic :: pf_mesozoic :: ?


Original Description
Test free, small, trochospiral about 2 1/2 whorls, flat to slightly convex on spiral side, flattened to concave on umbilical side, umbilicus wide, deep, outline deeply lobate, periphery rounded. Chambers spherical to slightly lunate, increasing evenly in size with growth, 6 to 7 in last whorl, last chambers of large specimens tend to shift onto the umbilical side of test. Sutures radial, depressed, distinct. Wall calcareous, surface with numerous small pits Aperture extraumbilical, a low, semicircular arch, basal in position, visible only in edge view, with small apertural lip bordering upper edge.

Size: Greatest diameter of holotype .179 mm; greatest thickness .080 mm.

Etymology: The specific name is from the Greek trema, trematos, meaning "hole," in refer-ence to the deep umbilicus of the new species.

Extra details from original publication
Remarks: Specimens of this new species were compared to the holotype and paratypes of Globorotaloides suteri Bolli and G. variabilis Bolli. The holotype and four paratypes of G. suteri were found to be identical to specimens of G. hexagona (Natland) from Recent sediments off southern California. Globorotaloides hexagona was originally referred to Globigerina by Natland ( 1938) and subsequently transferred to Globoquadrina by Parker ( 1962) . It is here placed in Globorotaloides because it has all the distinguishing characters of that genus. Globorotaloides trema is differentiated from G. hexagona and G. variabilis by its much smaller size (generally less than 50% ), more numerous chambers in the last whorl ( 6 to 7 rather than 5 to 6), less inflated chambers, flatter test, smaller diameter of the surface pits, and an apparent lack of terminal bullaelike chambers. In addition it is separated from G. variabilis by its nearly spherical chambers and straight sutures.

References:

Lipps, J. H. (1964). Miocene planktonic foraminifera from Newport Bay, California. Tulane Studies in Geology and Paleontology. 2: 109-133. gs


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Globorotaloides trema compiled by the pforams@mikrotax project team viewed: 9-4-2020

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