CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina eggeri Rhumbler 1901

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 eggeri
Other pages this level: << < G. difformis, G. digitata, G. dinodensis, G. diplostoma, G. dissimilis, G. druryi, G. druryi decoraperta, G. dubia, G. dubia lakiensis, 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, > >>

Globigerina eggeri

Citation: Globigerina eggeri Rhumbler 1901
Rank: species
Type locality: Challenger Station 300, depth 1375 fathoms, North of Juan Fernandez
Type age: Recent
Holotype Repository: London, UK; NHM
Type & figured specimens: ZF.1482 - syntypes; 1959 .5. 11.741 - lectotype designated by Banner & Blow 1960

Linked specimens: London, UK; NHM (1959.5.11.741)

Current identification/main database link: Neogloboquadrina dutertrei (d’Orbigny, 1839)


Original Description
Description of lectotype: The fairly large test is composed of about 14 chambers arranged in about 2½ whorls in a moderately high and fairly loosely coiled trochospire. There are about five chambers in the initial whorl increasing to six in the ultimate whorl. The equatorial profile is subcircular and the equatorial periphery is moderately lobulate. The axial is broadly rounded 'with the dorsal side being distinctly convex. The axial periphery is smoothly and broadly rounded. The chambers are inflated, moderately embracing, reniform to hemispherical in dorsal aspect and rounded ovoid in axial view. The chambers are not greatly appressed. The dorsal and ventral intercameral sutures are distinctly depressed an d nearly radial. The spiral suture is also depressed, and is broadly and evenly lobulate. The umbilicus is moderately broad, probably very deep (the umbilicus is infilled in the lectotype). The aperture is an interiomarginal, umbilical, fairly high arch leading directly into the umbilicus; no apertural lip or rim is visible on the lectotype. The wall is fairly thick, distinctly, fairly coarsely and uniformly perforate. The surface of the test is cancellate and was apparently uniformly and finely hispid. [Banner & Blow 1960]

Size: Maximum diameter of lectotype: 0.67 mm. [Banner & Blow 1960]

Extra details from original publication

Taxonomic remarks: Egger, in 1857; described Globigerina dubia from the Miocene of Germany; this species appears to be a moderately high spired form with a small and almost closed umbilicus. In 1901, Rhumbler realised that forms obtained from recent seas and referred to "dubia"" by Brady (1884) and Flint (1899) were distinct from Egger's species; as Rhumbler stated, they are larger, with thicker and rougher walls and with a broader umbilicus in which the relict parts of many of the primary apertures of the last whorl can be observed. In consequence, he proposed as new the species Globigerina eggeri putting Brady's ""Challenger"" specimens in full synonymy and illustrating his description with a reproduction of Brady's illustrations.
Although Brady referred to his illustrations (1884, pl. 79, figs. 17a-c) as being of ""a bottom specimen"" (note the use of the singular) our studies of Brady's material have disclosed that actually three separate and different specimens were drawn by Brady's artist, A. T. Hollick. The slide (Challenger Collection B. M. (N. H.) Registered No. ZF.l482 from Challenger Station 300, depth 1375 fathoms, North of Juan Fernandez) contained six specimens; it was marked in Brady's handwriting as ""fig. 17."" Amongst these specimens, one had a broken dorsal side but its umbilical view agreed with that illustrated by Brady (1884) as fig. 17b. The specimen illustrated as fig. 17a is characterised by an irregular series of chambers in the penultimate whorl and was also present in this slide ZF.1482. No specimen could be found which clearly matched Brady's figure 17c. Dr. C. G. Adams and Miss C. Underwood agreed with us in these identifications; consequently, the specimen illustrated by Brady (1884) as figure 17a (not figures 17b and 17c) has been isolated and re-registered in the British Museum (Natural History) as specimen number 1959 .5. 11.741.<br> 
The three specimens illustrated by Brady and referred to by Rhumbler (1901) stand as syntypes of the species Globigerina eggeri Rhumbler. Rhumbler designated no type locality for his species, stating that it occurred in the North and South Atlantic and also in the North and South Pacific oceans from 56° N. to 46° S. latitude. Brady (1884) mentioned no specific locality for his specimens, but the specimen we have isolated falls within the geographical limits recorded by Rhumbler. This isolated specimen (1959.5.11.741) is hereby designated the lectotype of Globigerina eggeri Rhumbler 1901. [Banner & Blow 1960]

Remarks: This species is distinguished from Globigerina dutertrei d'Orbigny by its consistently larger test in the adult with more numerous and less appressed chambers in the last whorl. In dorsal aspect the chambers of G. eggeri are circumferentially shorter relative to their radial breadth than are the dorsal sides of the chambers in G. dutertrei. The surface of the test in G. eggeri is more distinctly cancellate, more coarsely perforate and rougher than in d'Orbigny's species. The dorso-peripheral shoulder is less marked in G. eggeri than in G. dutertrei. This form is known to us in coUections from the recent seas and from subrecent deposits off the coast of Nigeria. It may occur in the Pleistocene but there are no definite records of this form in the Pliocene. [Banner & Blow 1960]"

References:

Banner, F. T. & Blow, W. H. (1960a). Some primary types of species belonging to the superfamily Globigerinaceae. Contributions from the Cushman Foundation for Foraminiferal Research. 11: 1-41. gs

Brady, H. B. (1884). Report on the Foraminifera dredged by H.M.S. Challenger, during the years 1873-1876. Rep. Sci. Results H.M.S. Challenger 1873-6. 9 (Zoology): 1-814. gs

Egger, J. G. (1857). Die Foraminiferen der Miocän-Schichten bei Ortenburg in Nieder-Bayern. Neues Jahrbuch fur Mineralogie, Geognosie, Geologie, und Petrafaktenkunde (1857). 266-311. gs

Rhumbler, L. (1901). Nordische Plankton-Foraminiferen. In, Brandt, K. (ed.) Nordische Plankton. Lipsius und Tischer, Kiel Lief. 1, 14: 1-32. gs


logo

Globigerina eggeri compiled by the pforams@mikrotax project team viewed: 27-2-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=130458 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics