pforams@mikrotax - Acarinina strabocella

Citation: Acarinina strabocella (Loeblich&Tappan 1957)

Basionym: Globorotalia strabocella

Synonyms:

Globorotalia angulata (White) var. praepentacamerata Shutskaya, 1956:94, 95, pl. 3: fig. 3 [Acarinina praepentacamarata Zone, Elburgan Fm., Khieu River section, northern Caucasus].
Globorotalia strabocella Loeblich and Tappan, 1957a: 195, pl. 61: fig. 6a-c [Nanafalia Fm., Alabama].
Globorotalia praepentacamerata Shutskaya.—Luterbacher, 1964:665, pl. 40: fig. 45 [Acarinina tadjikistanensis djanensis Zone, Elburgan Fm., Khieu River, northern Caucasus; topotype determined by Shutskaya].
Acarinina praepentacamerata (Shutskaya). —Shutskaya, 1970b: 118-120, pl. 21: figs. 8, 10 [Acarinina praepentacamerata Zone, Chaldzhin Fm., Malyi Balkhan, western Turkmenia], pl. 22: fig. 2 [lower subzone of Acarinina tadjikistanensis djanensis Zone, Lower Danatin Mbr., Malyi Balkhan Ridge, western Turkmenia],—Stott and Kennett, 1990:558, pl. 4: figs. 9, 10 [Zone A4, ODP Hole 689B/23X/1: 108-112 cm; Maud Rise, Weddell Sea, Southern Ocean].—Huber, 1991b:439, pl. 2: figs. 1,2 [Zone AP5, ODP Hole 738C/11R: 286.04 msbf; Kerguelen Plateau, southern Indian Ocean].
Globorotalia (Acarinina) strabocella Loeblich and Tappan.—Jenkins, 1971:84, pl. 4: figs. 102-104 [Globigerina triloculinoides Zone, lower Waipawan Stage, New Zealand].
Acarinina praeangulata (Blow).—Huber, 1991a:439, pl. 1, figs. 6, 7 [Zone AP4, ODP Hole 738C/16R: 332.15 mbsf; Kerguelen Plateau, southern Indian Ocean]. [Not Blow, 1979.] [Olsson et al. 1999]

Taxonomic discussion: Shutskaya (1956; see also 1970a, 1970b) described Globorotalia angulata var. praepentacamerata from the lower Paleocene of the northern Caucasus and showed that it had a wide distribution in the southwestern part of the former Soviet Union. Luterbacher (1964:665) suggested that Globorotalia strabocella Loeblich and Tappan may be a junior synonym. We agree with this assessment particularly inasmuch as comparison of our material with the holotype of G. strabocella at the NMNH shows them to be morphologically similar. In view of the fact that there is no original (type) material remaining of Shutskaya's taxon (nor of any other taxa that she described, for that matter, with rare exception), we prefer to use the name strabocella for this taxon because of the fact that there is well-preserved type material at a readily accessible museum (the NMNH in Washington), which aids in stabilizing the nomenclature.
Shutskaya (1970b: 118, 120, fig. 13) showed that A. praepentacamerata is restricted to the A. praepentacamerata Zone and the lower subzone of the overlying A. tadjikistanensis djanensis Zone in the southwestern part of the former Soviet Union [= Zone P3 (middle part) to ? P4 [lower part)]. This is similar to our observations. The forms referred to A. wilcoxensis strabocella from Zones P6-P8b by Blow (1979:970, pis.
114, 129, 132, 251) are considered unrelated to strabocella; they differ in their more evolute coiling, flatter spiral coil, and strongly muricate ornament. They represent a younger, more advanced acarininid morphology than that seen in A. strabocella. In fact, we view A. strabocella as representing the stem form of the acarininid radiation that occurred at the P3-P4 zonal transition. [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: Test nearly circular, 5-6 chambers in final whorl, weakly lobulate outline; axial periphery broadly rounded to subangular, chambers on umbilical side moderately convex, early whorls on spiral side elevated above later whorl(s); umbilicus usually broad and open exposing earlier whorls; entire test weakly muricate, aperture an interiomarginal, umbilical-extraumbilical slit.

Description

5-6 chambered, nearly circular test with weakly lobulate outline; axial periphery broadly rounded to subangular, chambers on umbilical side moderately convex, early whorls on spiral side elevated above later whorl(s); umbilicus usually broad and open exposing earlier whorls; test weakly pustulose (muricate) over the entire surface of the test, aperture an interiomarginal, umbilical-extraumbilical slit. [Olsson et al. 1999]

Biogeography and Palaeobiology

Northern middle latitudes to the Southern Ocean (Figure 21). [Olsson et al. 1999]
Aze et al. 2011 summary: Northern middle latitudes to the Southern Ocean; based on Olsson et al. (1999)

No data available. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts; based on comparison with other species of the genus.

The origin of the first Acarinina species is somewhat obscure. The wall surface ofA. strabocella is smooth with simple and coalescent pustules (Plate 5: Figure 1) that become more heavily developed on the older part of the test. The origin of this species may be linked with the moderately pustulose Morozovella praeangulata in the lower part of Zone P3 and may have diverged from early forms of this species. Alternatively, A. strabocella may have evolved from Praemurica inconstans by developing a tighter coil and a lower rate of chamber enlargement. In any case, A. strabocella represents the stem form of the acarininid radiation. Reduction of the number of chambers in the final whorl and the increased development of muricae are seen in the derivation of A. nitida from A strabocella. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Zone P3 (lower part) to Zone P4 (lower part). [Olsson et al. 1999]
Last occurrence (top): in lower part of P4 zone (30% up, 59.6Ma, in Selandian stage). Data source: Olsson et al. 1999
First occurrence (base): within P3 zone (60.73-62.29Ma, base in Danian stage). Data source: Olsson et al. 1999

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 50

References:

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

Huber, B. T. (1991d). Planktonic foraminifer biostratigraphy of Campanian-Maestrichtian sediments from ODP Leg 114, Sites 698 and 700, southern South Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 114: 281-297. gs

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

Luterbacher, H. P. (1964). Studies in some Globorotalia from the Paleocene and Lower Eocene of the Central Apennines. Eclogae Geologicae Helvetiae. 57: 631-730. gs O

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

Shutskaya, E. K. (1956). Стратиграфия нижних горизонтов палеогена Центрального Предкавказья по фораминиферам - Stratigraphy of the lower horizons of the Paleogene of the central Precaucasus according to the foraminifera. Maden Tetkik ve Arcana Enstitusu Yayinharindam (Mining Research and Exploration, Institute of Turkey Publ.).. 71(164): 3-119. gs

Shutskaya, E. K. (1970a). Morphologic groups and descriptions of species of Globigerina and Acarinina in the lower Paleogene of the Crimea, the Caucasus Foreland, and western Central Asia. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 69: 79-113. gs

Shutskaya, E. K. (1970b). Stratigrafiya, foraminifery i paleogeografiya nizhnego paleogena Kryma, predkavkaz'ya i zapadnoi chadsti srednei azii [Stratigraphy, Foraminifera and Paleogeography of the Lower Paleogene in the Crimea, Precaucasus and the Western Part of Central Asia]. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 70(1): 256-. 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

Stott, L. D. & Kennett, J. P. (1990). The Paleoceanographic and Paleoclimatic signature of the Cretaceous/Paleogene boundary in the Antarctic: Stable isotopic results from ODP Leg 113. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 829-848. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	Shallow	wall texture:	Moderately muricate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	5-6	N.B. These characters are used for advanced search. N/A - not applicable

Acarinina strabocella

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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