pforams@mikrotax - Acarinina nitida

Acarinina nitida

Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina nitida
Sister taxa: << < A. mckannai, A. subsphaerica ⟩⟨ A. bullbrooki, A. punctocarinata, A. boudreauxi, A. rohri, A. topilensis, A. praetopilensis, A. mcgowrani, A. quetra, A. pseudotopilensis, A. wilcoxensis, A. esnaensis, A. primitiva, A. coalingensis, A. nitida, A. strabocella, A. sp.


Citation: Acarinina nitida (Martin 1943)
Rank: Species
Basionym: Globigerina nitida
Taxonomic discussion: This form is generally recognized to be a senior synonym of Acarinina acarinata (Subbotina), type species of the genus Acarinina (Stainforth et al., 1975; Luterbacher, 1975b; Berggren, 1977, who compared the holotype of nitida with topotypes of acarinata; Toumarkine
and Luterbacher, 1985). It is one of the earliest acarininids appearing together with A. subsphaerica at the base of Zone P4. Acarinina nitida represents an intermediate stage between the weakly muricate A. strabocella and the more strongly muricate upper Paleocene acarininids. Subbotina (1953) considered that acarinata ranged up to the base of her zone of conical globorotaliids (= P6a/b boundary of this work). Our observations agree more closely with Blow (1979), who indicated its LAD occurs in his Zone P5 or possibly lower P6.
The holotype of Acarinina intermedia Subbotina, 1953 (Plate 12: Figures 4-6), is a poorly preserved specimen with a missing ultimate chamber and an obscured umbilicus. The general morphology of this specimen shows four chambers in the ultimate whorl and heavily muricate umbilical shoulders suggesting a linkage to nitida. Acarinina nitida has also been previously identified under different names (see synonomy) by Weiss (1955), Bolli (1957a), and Loeblich and Tappan (1957a). [Olsson et al. 1999]

Catalog entries: Globigerina nitida, Acarinina acarinata, Acarinina intermedia, Globigerina stonei

Type images:

Distinguishing features:
Parent taxon (Acarinina): Moderate to low trochospire; chambers ovoid, usually 4-6 in final whorl.
Wall muricate with pustules on umbilical shoulders;

This taxon: Test compact, small, trochospiral, with 4 (rarely 5) rounded, tightly packed, radially compressd and axially elongate chambers; early whorls raised above surface of last whorl; moderately muricate, particularly on umbilical side.

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.


Emended description:


Wall type:


Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Moderately muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Similar species

Geographic distribution
This form is geographically widespread in (sub)tropical regions and has been reported from high southern latitudes on the Kerguelen Plateau (Huber, 1991b) and Maud Rise, Weddell Sea (Stott and Kennett, 1990) at 62° S and 65° S, respectively. [Olsson et al. 1999]
Aze et al. 2011 summary: Low to high southern latitudes; based on Olsson et al. (1999)

Isotope paleobiology
Acarinina nitida has ∂18O values similar to co-existing morozovellids, such as M. velascoensis and M. subbotinae, and shows a slight negative size-trend in ∂18O (D'Hondt et al., 1994). The ∂13C of A. nitida is much more positive than that of Subbotina and is similar to that of Morozovella (D'Hondt et al., 1994). [Olsson et al. 1999]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy _13C and relatively light _18O. Sources cited by Aze et al. 2011 (appendix S3): D'hondt et al. (1994)

Phylogenetic relations
Acarinina nitida is related to unkeeled morozovellids with which the acarininids share a similar ornamentation consisting of deep funnel-shaped entrances to the pores, short, weakly developed muricae at the interpore ridges, deeply incised sutures, and a tendency toward slightly anguloconical chambers in the final whorl. Acarinina nitida is derived from A. strabocella from which it differs in having only four chambers in the final whorl, more involute coiling, and a more coarsely muricate surface texture. Bolli (1957a) and Blow (1979) suggested that Globorotalia whitei /A. acarinata, respectively, was the ancestor ofA. wilcoxensis and we concur. [Olsson et al. 1999]

Most likely ancestor: Acarinina strabocella - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, fig5a.
Likely descendants: Acarinina coalingensis; Acarinina esnaensis; Acarinina subsphaerica; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Zone P4a to lower Zone P4c. [Olsson et al. 1999]
Last occurrence (top): in upper part of P4c subzone (60% up, 57.4Ma, in Thanetian stage). Data source: Olsson et al. 1999
First occurrence (base): within P4a subzone (60.52-60.73Ma, base in Selandian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 48


Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

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 V O

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

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. 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: 173-198. gs V O

Martin, L. T. (1943). Eocene foraminifera from the type Lodo Formation, Fresno County, California. Stanford University Publications, Geological Sciences. 3(3): 1-35. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs

Soldan, D. M., Petrizzo, M. R., Silva, I. P. & Cau, A. (2011). Phylogenetic relationships and evolutionary history of the Paleogene genus through parsimony analysis. Journal of Foraminiferal Research. 41: 260-284. gs

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

Weiss, L. (1955a). Foraminifera from the Paleocene Pale Greda Formation of Peru. Journal of Paleontology. 29(1): 1-21. gs


Acarinina nitida compiled by the pforams@mikrotax project team viewed: 4-12-2022

Taxon Search:
Advanced Search

Short stable page link: Go to 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
Captcha Image
Powered by Commentics