CATALOG OF ORIGINAL DESCRIPTIONS: Globorotaloides trema Lipps 1964
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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. gsO
Globorotaloides trema compiled by the pforams@mikrotax project teamviewed: 11-10-2024
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Lipps 1964 pl4 f3.JPG
Lipps 1964 pl4 f3.JPG
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