Acarinina mckannai


Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina mckannai
Sister taxa: A. medizzai, A. collactea, A. pentacamerata, A. aspensis, A. interposita, A. echinata, A. pseudosubsphaerica, A. alticonica, A. soldadoensis, A. cuneicamerata, A. angulosa, A. africana, A. sibaiyaensis, A. esnehensis, 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, > >>

Taxonomy

Citation: Acarinina mckannai (White 1928)
Rank: Species
Basionym: Globigerina mckannai
Synonyms:
Taxonomic discussion: Acarinina mckannai is one of the most common and broadly distributed upper Paleocene acarininids and is easily recognized by its large, globular, muricate test with generally 5 to 6 chambers in the final whorl. This species is closely allied with A. subsphaerica, and, indeed, complete intergradation exists between them in spire height, umbilical size, and the number of chambers in the final whorl. Shutskaya (1958, 1970a) figured a large number of specimens as A. subsphaerica, some of which are clearly referable to A. mckannai due to their low spire height. [Olsson et al. 1999]

Catalog entries: Globigerina mckannai

Type images:

Distinguishing features: Large; 4½-6 chambers in final whorl; moderate to low spired, final chamber often curving partly over the umbilicus; umbilical surface strongly muricate; peripheral margin rounded with chambers elongate parallel to the coiling axis and in the direction of coiling; umbilicus deep and large.

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: Large, 4.5 to 6 chambers in final whorl, moderate to low spired, final chamber often curving partly over the umbilicus in high-spired variants; strongly muricate on the umbilical surface with deep, funnel-shaped entrances to the pores over the rest of the test; chambers slowly increasing in size in the final whorl; peripheral margin rounded with chambers elongate parallel to the coiling axis as well as elongate in the direction of coiling; sutures deep, straight, and incised on the umbilical surface, gently depressed on the spiral side and slightly curved; umbilicus deep and large; aperture interiomarginal, umbilical-extraumbilical without a lip. [Olsson et al. 1999]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Moderately muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.5-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Acarinina mckannai is a broadly distributed species in the tropical to subtropical oceans. Specimens have been reported from the high southern latitudes (Huber, 1991b), although these are neither as coarsely muricate nor as inflated as typical low-latitude representatives of the species (Figure 19). [Olsson et al. 1999]
Aze et al. 2011 summary: Low latitudes; based on Olsson et al. (1999)

Isotope paleobiology: Acarinina mckannai has ∂18O slightly more negative than coexisting morozovellids, such as M. velascoensis, and shows no size related trends in ∂18O (Shackleton et al., 1985). The ∂13C of A. mckannai is much more positive than that of Subbotina and is similar to, or slightly more negative than, that of Morozovella and Igorina (Shackleton et al., 1985). [Olsson et al. 1999]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Shackleton et al. (1985)

Phylogenetic relations: Acarinina mckannai evolved from A. subsphaerica by a reduction in spire height and an increase in whorl expansion rate. These taxa are the first acarininds to acquire a coarsely pustulose (muricate) ornamentation on the umbilical surface. Acarinina subsphaerica appears before A. mckannai in our material and retains the slightly anguloconic test shape of A. nitida, suggesting that A. subsphaerica is more primitive than A. mckannai. [Olsson et al. 1999]

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

Biostratigraphic distribution

Geological Range:
Notes: Zone P4a to lower Zone P4c. [Olsson et al. 1999]
Last occurrence (top): in lower part of P4c subzone (30% up, 57.6Ma, in Thanetian stage). Data source: Olsson et al. 1999
First occurrence (base): in lower part of P4b subzone (30% up, 59.7Ma, 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

References:

Belford, D. J. (1984). Tertiary foraminifera and age of sediments, Ok Tedi-Wabag, Papua New Guinea. Bureau of Mineral Resources, Australia, Bulletin. 216: 1-52. gs :: ::

Bolli, H. M. & Cita, M. B. (1960). Globigerine e Globorotalie del Paleocene di Paderno d'Adda (Italia). Rivista Italiana di Paleontologia e Stratigrafia. LXVI(3): 1-42. 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 :: ::

Hillebrandt, A. , von (1962). Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg. Abhandlungen Bayerischen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse, Neue Folge. 108: 1-182. gs :: ::

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. gs :: ::

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs :: ::

Krasheninnikov, V. A. & Hoskins, R. H. (1973). Late Cretaceous, Paleogene and Neogene Planktonic Foraminifera. Initial Reports of the Deep Sea Drilling Project. 20: 105-203. 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 :: ::

Lu, G. & Keller, G. (1993). The Paleocene-Eocene transition in the Antarctic Indian Ocean: Inference from planktic foraminifera. Marine Micropaleontology. 21: 101-142. gs :: ::

Morozova, V. G. (1957). On the Foraminiferal superfamily Globigerinidea, nov. and some of its representatives (in Russian). Doklady Akademii Nauk SSSR. 114(5): 1109-1112. 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 :: ::

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. 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 :: ::

Soldan, D. M., Petrizzo, M. R. & Silva, I. P. (2014). Pearsonites, a new Paleogene planktonic foraminiferal genus for the broedermanni lineage. Journal of Foraminiferal Research. 44: 17-27. gs :: ::

Toumarkine, M. & Luterbacher, H. (1985). Paleocene and Eocene planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge Univ. Press, Cambridge 87-154. gs :: ::

White, M. P. (1928). Some Index Foraminifera of the Tampico Embayment Area of Mexico. Journal of Paleontology. 2(3): 177-215. gs :: ::


logo

Acarinina mckannai compiled by the pforams@mikrotax project team viewed: 6-6-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=100017 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