CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina tecta Lipps 1964
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Citation: Globigerina tecta Lipps 1964taxonomic rank: speciesType specimens: Types: Holotype (Plate I, figures 6a-c) UCLA no. 34711; 100 unfigured paratypes UCLA no. 34712. All types from sample 2 (Luisian).Type age (chronostrat): MioceneType locality: Globigerina tecta is common in sample 2 (Luisian) .
Type repository: Los Angeles; University of California, , USA
Current identification:
Original Description Test free, small, trochospiral, 2 1/2 to 3 whorls, flattened to slightly convex on both sides, umbilicus small, deep when uncovered, outline lobate, periphery rounded. Chambers inflated, increasing slightly in size with growth, circular to slightly rectangular in side view, ovate in umbilical and edge views, final chamber with elongation covering umbilicus in most specimens. Sutures distinct, radial, in narrow depression. Wall coarsely hispid. Aperture an umbilical arch of differing height, at end of extension of terminal chamber. Size: Greatest diameter of holotype .208 mm; greatest thickness .102 mm. Etymology: The specific name is from the Latin tectus meaning "cover," in reference to the modified last chamber which covers the umbilical area. Extra details from original publication Remarks: This new species is similar to Globigerina quinqueloba described from Recent sediments off Southern California (Natland, 1938). In the spiral view, the chambers of G. tecta are generally ovate, whereas those of G. quinqiteloba are rectangular. In general, G. tecta has more chambers (5 to 7) than G. quinqueloba (4 to 5), and the final chamber does not cover the umbilical area as completely. The spire of G. tecta is most commonly flat whereas that of G. quinqueloba varies from flat to mainly convex. These two species appear to be very closely related. Forms intermediate in age have not been described nor figured, hence inferences as to the relationship of the Miocene species to the Recent one as yet cannot be made.
References:
Lipps, J. H. (1964). Miocene planktonic foraminifera from Newport Bay, California. Tulane Studies in Geology and Paleontology. 2: 109-133. gsO
Globigerina tecta compiled by the pforams@mikrotax project teamviewed: 11-9-2024
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Lipps 1964 pl1 f6.JPG
Lipps 1964 pl1 f6.JPG
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