CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina pera Todd 1957

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 pera
Other pages this level: << < G. ouachitaensis gnaucki, G. ouachitaensis senilis, G. ovoidea, G. oxfordiana, G. panormensis, G. parabulloides, G. paradubia, G. paraobesa, G. paratriloculinoides, G. paravenezuelana, G. parisiensis, G. partidiana, G. parva, G. patagonica, G. pauciloculata, G. pera, G. picassiana, G. pileata, G. planispira, G. planoexilis, G. polusi, G. portsdownensis, G. postcretacea, G. posttriloculinoides, G. posttriloculinoides clinata, G. praebulloides, G. praebulloides leroyi, G. praebulloides occlusa, G. praebulloides pseudociperoensis, G. praebulloides pseudoleroyi, G. praebulloides tinguarensis> >>

Globigerina pera

Citation: Globigerina pera Todd 1957
Rank: Species
Type locality: Holotype (fig. 10) and paratype (fig. 11) from locality S385, northeast-central Saipan, Mariana Islands. Found also at five other Saipan localities.
Type age (chronostrat): Upper Eocene
Type sample (& lithostrat): Hagman formation. Occurs also in the upper Eocene Densinyama formation.
Type specimens: holotype (fig. 10), no. 623805; paratype (fig. 11), no. 623806.
Type repository: Washington; USNM

Linked specimens: USNM-623806 USNM-623805

Current identification/main database link: Subbotina corpulenta (Subbotina 1953)


Original Description
"Test somewhat compressed, low spired. Chambers few, rapidly increasing in size as added; 3ÃÇÂ_ to 4 constituting the adult whorl, with a smaller and smoother supplementary chamber extending from the periphery downward over the umbilicus. Sutures deeply incised. Wall calcareous, perforate, covered by a fine-grain pattern of round pits [possibly the basis for delicate spines during the life of the animal] and stubby irregular apines. Aperture a single opening under the lip at the inner edge of the supplementary chamber that covers the umbilicus.

Size: Length 0.55-0.65 mm.; width 0.48-0.55 mm.; thickness 0.35-0.48 mm.

Extra details from original publication

This species is easily confused with the Oligocene species Globigerina dissimilis Cushman and Bermudez, which it superficially resembles. The distinction between the two species lies in the supplementary chamber, which in G. dissimilis is like a bridge open at both ends, over the umbilicus, but in the present species is like a pocket, open only at one end. In addition, this species is more compressed than G. dissimilis. In the pocketlike supplementary chamber, G. pera resembles Globigerina turgida Finlay as illustrated and described by Brönnimann (1952, p. 19, pl. 3, figs. 1-3) but is a more elongate and more strongly compressed form. Globigerina bakeri Cole, which occurs with the present species, also usually has a pocketlike supplementary chamber present, but G. bakeri is a larger, high-spired form with the last several chambers of nearly equal size.


Editors' Notes
content migrated from chronos

References:

Brönnimann, P. (1952d). Trinidad Paleocene and lower Eocene Globigerinidae. Bulletins of American Paleontology. 34(143): 1-34. gs

Todd, R. (1957). Smaller foraminifera, in Geology of Saipan, Mariana Islands, Pt. 3, Paleontology. U.S. Geological Survey, Professional Paper. 280-H: 265-320. gs V O


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Globigerina pera compiled by the pforams@mikrotax project team viewed: 27-11-2020

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