Globigerina prolata Bolli, 1957a, p. 72, pl. 15, figs. 24–26, (lower Eocene, Globorotalia formosa formosa, Lizard Springs Fm., Trinidad).
Globigerina prolata Bolli. Bolli, 1957b, p. 162, pl. 35, figs. 7a–b, (upper lower Eocene, Navet Fm., Trinidad).
Globorotalia thebaica Said, 1960, p. 284, pl. 1, figs. 6a–c, (Ypresian, Thebes Fm., Egypt).
Globigerina prolata Bolli. Samanta, 1973, p. 442, pl. 1, figs. 10–12, (lower Eocene, Zinda Pir, Rakhi Nala, Sulaiman Range, Pakistan).
Globigerina prolata Bolli. Krasheninnikov & Hoskins, 1973, p. 121, pl. 10, figs. 2–3, (lower Eocene, DSDP Hole 200A, Ita Mai Tai Guyot, western Pacific).
Globigerina lozanoi prolata Bolli. Blow, 1979, p. 856–858, pl. 145, fig. 1, (lower Eocene, Zone P9, Langley Fm., Jamaica); pl. 250, fig. 10, (topotype).
Globigerina prolata Bolli. Lu & Keller, 1993, p. 120, pl. 3, fig. 20, (lower Eocene, Kerguelen Plateau, S Indian Ocean).
Distinguishing features: Parent taxon (Alicantina): This taxon: Like A. lozanoi but test smaller with 4–5 chambers in the final whorl, looser coiling and a lower spire.
NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They are being edited as the site is developed and comments on them are especially welcome.
Description
Emended description: Morphology: Test small, low trochospiral, equatorial periphery moderately elongate, lobulate in outline; pe- ripheral margin rounded; in spiral view 4–4½ globular de-pressed, moderately embracing chambers in ultimate whorl, increasing rapidly in size, sutures radial or slightly curved, moderately depressed; in umbilical view 4½–5 globular, moderately embracing chambers, increasing moderately in size, sutures moderately depressed, straight; umbilicus a moderate sized opening, enclosed by surrounding chambers; aperture wide essentially intraumbilical, apparently slightly extraumbilical; in edge–view, chambers globular in shape, moderately embracing, aperture visible as a low arch. [Soldan et al. 2018] Wall type: Size:
Character matrix
test outline:
Lobate
chamber arrangement:
Trochospiral
edge view:
Inequally biconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Globular
coiling axis:
Low
periphery:
aperture border:
N/A
umb chbr shape:
Globular
umbilicus:
Narrow
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Moderately depressed
umb depth:
Deep
wall texture:
Cancellate
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Strongly depressed
final-whorl chambers:
4.0-5.0
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Similar species Geographic distributionWidely recorded at low and mid-latitudes in (sub)tropical assemblages [Soldan et al. 2018] Isotope paleobiology Phylogenetic relations
Probably evolved from a parasubbotinid-like taxon possessing a non-spinose wall texture in the early Eocene and is ancestral to Alicantina lozanoi. [Soldan et al. 2018]
Biostratigraphic distribution
Geological Range: Notes: Zone E4 (mid lower Eocene) to E8 (lower part of middle Eocene). Last occurrence (top): within E8 zone (43.85-45.72Ma, top in Lutetian stage). Data source: Soldan et al. 2018 First occurrence (base): within E4 zone (52.54-54.61Ma, base in Ypresian stage). Data source: Soldan et al. 2018
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Alicantina
Primary source for this page: Soldan et al. 2018 p.48-49
References:
Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 61-82. gsVO
Postuma, J. A. (1962). Manual of planktonic foraminifera. Bataafse Internationale Petroleum Maatschappij N.V The Hague. -. gs
Soldan, D., Petrizzo, M. R. & Premoli Silva, I. (2018). Alicantina, a new Eocene planktonic foraminiferal genus for the lozanoi group. Journal of Foraminiferal Research. 38(1): 41-52. gs
Alicantina prolata compiled by the pforams@mikrotax project teamviewed: 6-2-2023
Postuma 1963 prolata.JPG
Postuma 1963 prolata ts.JPG
Postuma 1963 prolata.JPG
Postuma 1963 prolata ts.JPG
holotype: G. prolata
holotype: G. prolata
