Alicantina prolata


Classification: pf_cenozoic -> Truncorotaloididae -> Alicantina -> Alicantina prolata
Sister taxa: A. prolata, A. lozanoi,

Taxonomy

Citation: Alicantina prolata (Bolli 1957)
Rank: Species
Basionym: Globigerina prolata Bolli, 1957
Synonyms:

Catalog entries: Globigerina prolata

Type images:

Distinguishing features: 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


Diagnostic characters: Alicantina prolata differs from Alicantina lozanoi in having a smaller test size with 4–5 chambers in the final whorl, looser coiling and a lower spire.

Test 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]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:aperture border:N/A
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5┬Ám
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Widely recorded at low and mid-latitudes in (sub)tropical assemblages [Soldan et al. 2018]

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:

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. gs :: ::

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 :: ::


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Alicantina prolata compiled by the pforams@mikrotax project team viewed: 2-6-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104400 Go to Archive.is to create a permanent copy of this page - citation notes



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