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.


Higher levels: pf_cat -> G -> Globigerina -> Globigerina hornibrooki
Other pages this level: << < G. guadalupensis, G. hagni, G. haitiensis, G. hancocki, G. haoi, G. haynesi, G. helicina, G. helicina aculeata, G. helvetojurassica, G. hevensis, G. hexagona, G. hillebrandti, G. hirsuta, G. hoelzli, G. hofkeri, G. hornibrooki, G. horrida, G. hoterivica, G. hybrida, G. inaequispira, G. inaequispira angusta, G. inaequispira incluta, G. inaequispira testata, G. inaequispira transversa, G. inaequispira universa, G. incisa, G. incompta, G. inconstans, G. increbescens, G. incretacea, G. inflata, > >>

Globigerina hornibrooki

Citation: Globigerina hornibrooki Bronnimann 1952
Rank: Species
Type locality: Lower zone of Lizard Springs formation,Guayaguayare area,south Trinidad, BWI
Type age: Cretaceous
Type sample and level: Lizard Springs formation
Holotype Repository: Washington; USNM
Type & figured specimens: USNM370078 Plate 2,figures 4-6.Rz.287; T.L.L.,Cat.No.50506.

Linked specimens: USNM-370081

Current identification/main database link: Subbotina hornibrooki (Bronnimann 1952)


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
RemarksG.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. (1952e). Trinidad Paleocene and lower Eocene Globigerinidae. Bulletin of American Paleontology. 34(143): 1-34. gs :: ::

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006b). 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. gs :: ::


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Globigerina hornibrooki compiled by the pforams@mikrotax project team viewed: 29-5-2020

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