CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina hornibrooki Bronnimann 1952
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.
Original Description The medium-sized test is a trochoid spiral of about 2½ volutions of which the final one is four chambered. The rounded outline is weakly lobulate. The subglobular chambers are rapidly increasing in size with the exception of the end chamber which is smaller than the penultimate one, peripherally flattened, and elongate in the direction of the axis of the test. The small umbilicus is deep enough to expose the apertures of earlier chambers. The well-defined sutures are straight in the end stage but curved in the direction of coiling in the early portion of the test. The large arcuate aperture is umbilically situated, elongate and provided with a minute liplike border. The walls are finely perforate. The surface is pitted, the species is coiled to both sides. Size: Holotype: Coiling: dextral. Dimensions: maximum diameter, 0.28mm.; end chamber radial diameter, 0.045mm.; tangential diameter, 0.145mm.; height, 0.175mm Etymology: The species is named for N.de B.Hornibrook, Wellington, New Zealand. Extra details from original publication Remarks. G.hornibrooki differs from G.linaperta and G. finlayi essentially in the arrangement of the chambers (finlayi) and in the development of the end chamber (linaperta). In perforation and pitting, G.hornibrooki is very similar to these species. The greatest diameter ranges from 0.22mm to 0.3mm., the average is about 0.28mm. Five out of eight specimens are coiled to the right.
Occurrence: Both zones of the Lizard Springs formation, rare to abundant; Soldado formation, rare; Ramdat marl, common.
References:
Brönnimann, P. (1952d). Trinidad Paleocene and lower Eocene Globigerinidae. Bulletins of American Paleontology. 34(143): 1-34. gs
Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. 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 6): 111-168. gsO
Globigerina hornibrooki compiled by the pforams@mikrotax project teamviewed: 16-10-2024
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Bronnimann 1952 pl2 f4-6.JPG
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