pforams@mikrotax - Acarinina mckannai

Citation: Acarinina mckannai (White 1928)

Synonyms:

Globigerina mckannai White, 1928:194, pl. 27: fig. 16a-c [Velasco Fm., Mexico].—Loeblich and Tappan, 1957a: 181, pl. 47: fig. 7a-c [Zone P4, Salt Mountain Fm., Alabama], pl. 53: figs. la-2c [Zone P4, Vincentown Fm., New Jersey], pl. 57: fig. 8a-c [Zone P4, Aquia Fm., Virginia], pl. 62: figs. 5a-6c [Zone P4, Velasco Fm,, Tamaulipas, Mexico], pl. 62: fig. 7a-c [designated lectotype, Columbia University No. 19878, Velasco Fm., Mexico],
Globorotalia mckannai (White).—Bolli, 1957a:79, pl. 19: figs. 16-18 [Globorotalia pseudomenardii Zone, lower Lizard Springs Fm., Trinidad],—Bolli and Cita, 1960:383, pl. 33: fig. 6a-c [Globorotalia velascoensis Zone, Pademo d'Adda, northern Italy].
Globorotalia (Acarinina) mckannai (White).—Hillebrandt, 1962:140, pl. 14: figs. 8a-10c [Zone F = Globorotalia velascoensis Zone, Reichenhall-Salzburg Basin, Austro-German border],—Jenkins, 1971:82, pl. 3: figs. 89-93 [Waipawan Stage, Middle Waipara River section, New Zealand],
Acarinina mckannai (White).—Krasheninnikov and Hoskins, 1973:116, pl. 2: figs. 6-8 [Globorotalia velascoensis Zone, DSDP Site 199/8; Caroline Abyssal Plain, eastern Equatorial Pacific Ocean].—Toumarkine and Luterbacher, 1985:116, text-fig. 18 [3a-c. reillustration of Bolli, 1957a, pl. 19: figs. 16-18; 5a-c, reillustration of holotype from White, 1928; 6a-c, specimen from northern Caucasus illustrated by Shutskaya, 1958] [in part, not 4a-c, reillustration of holotype of Globogerina subsphaerica Subbotina].—Lu and Keller, 1993:118, pl. 2: figs. 14-16 [Zone AP4, upper Paleocene, ODP Hole 738C/11R/CC; Kerguelen Plateau, southern Indian Ocean],
Muricoglobigerina mckannai (White).—Belford, 1984:13, pl. 22: fig. 408 [upper Paleocene, WABAG Sheet area, Papua, New Guinea].—Stott and Kennett, 1990:559, pl. 3: figs. 7, 8 [Zone AP6, ODP Hole 690B/17H/5: 36-40 cm; Maud Rise, Wedell Sea, Southern Ocean].
Acarinina praecursoria Morozova.—Huber, 1991b:439, pl. 1: figs. 3-5 [Zone AP5, ODP Hole 738C/16R: 332.15 mbsf; Kerguelen Plateau, southern Indian Ocean]. [Not Morozova, 1957.] [Olsson et al. 1999]

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]

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: 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.

Description

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]

Biogeography and Palaeobiology

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)

Acarinina mckannai has δ18O slightly more negative than coexisting morozovellids, such as M. velascoensis, and shows no size related trends in δ18O (Shackleton et al., 1985). The δ13C 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 _¹³C and relatively light _¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Shackleton et al. (1985)

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]

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

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. Australia Bureau of Mineral Resources Geology and Geophysics, 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. 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. (85): 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

test outline:	Circular	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Inflated	umbilicus:	Wide	periph margin shape:	Moderately rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Moderately muricate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	4.5-6	N.B. These characters are used for advanced search. N/A - not applicable

Acarinina mckannai

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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