CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina esnaensis Le Roy 1953

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 esnaensis
Other pages this level: << < G. dubiata, G. dudrouensis, G. dutertrei, G. eamesi, G. edita, G. edita polycamera, G. eggeri, G. eggeriformis, G. elburganica, G. elevata, G. elongata, G. elongata Shutskaya, G. eocaena, G. eocaenica, G. eocaenica irregularis, G. esnaensis, G. euapertura, G. eugubina, G. eximia, G. exumbilicata, G. falconensis, G. fariasi, G. finlayi, G. fistulosa, G. flosculus, G. foliata, G. fragilis, G. fringa, G. frontosa, G. galapagosensis, G. galavisi> >>

Globigerina esnaensis

Citation: Globigerina esnaensis Le Roy 1953
Rank: Species
Type locality: The Maqfi section, in a conspicuous escarpment 53 km. west and 37 km. north from the intersection of long. 29° E. and lat. 27° N., 69 km. N. 65° E. of the village of Qasr Farafra in the Farafra Oasis, and 400 km. S. 41° W. of Cairo, Egypt
Type age (chronostrat): Probably Lower Eocene but possibly Paleocene
Type sample (& lithostrat): base of the Esna formation, base of the Loxostomum applinae zonule; in soft, fissile, dark green to grayish green foraminiferal shale. Common throughout the Esna shale, but best in the lower two-thirds.
Type specimens: no. 58002.
Type repository: USNM;

Linked specimens: USNM-58002

Current identification/main database link: Acarinina esnaensis (LeRoy 1953)


Original Description
Test roughly quadrate in ventral view, low trochoid spiral, flattened dorsally, umbilicate ventrally; chambers inflated, usually four in last whorl, rarely five, gradually increasing in size as added, last one rather strongly inflated; sutures distinct, strongly depressed on ventral side; periphery broadly rounded, lobulate; wall roughened with minute nodes; aperture rather large, arched, at base of last chamber.

Size: Diameter 0.50-0.64 mm.; thickness 0.39 mm.

Extra details from original publication
This specjes may be identified by its quadrate outline and by the strongly inflated last chamber. The form differs from Globigerina quadrata White described from the Upper Cretaceous of Mexico by exhibiting more inflation of the last chamber, by having a roughened wall, and by showing a larger ventral umbilical depression. Some workers would probably assign this form to Globorotalia crassa (Cushman) var. densa (Cushman)

References:

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. 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 9): 257-326. gs V O

LeRoy, L. W. (1953). Biostratigraphy of the Maqfi Section, Egypt. Geological Society of America, Memoir. 54: 1-73. gs

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Globigerina esnaensis compiled by the pforams@mikrotax project team viewed: 28-1-2021

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