pforams@mikrotax - Acarinina pseudotopilensis

Citation: Acarinina pseudotopilensis Subbotina 1953

Basionym: Acarinina pseudotopilensis

Synonyms:

Globorotalia pseudotopilensis (Subbotina).—Reyment, 1960:81, 82, pl. 15: figs. 14a-c [uppermost Paleocene, Ilaro II Borehole, Nigeria]; pl. 15: 15-17, pl. 16: fig. 1a, b [lower Eocene, Otta Borehole, Nigeria].—Berggren 1960a:94-96, pl. 11: figs. 4a-c [lower Eocene, east coast island of Fehmarn, north-west Germany]; pl. 12: figs. 1a-c [Zone NP11-12, lower Eocene, Røgle Klint, Jutland, Denmark].—Stainforth and others, 1975:217, text-figs. 78: 1a-2c [reillustrations from literature], 78. 3-6 [lower Eocene, North Caucasus].—Luterbacher, 1975:65, pl. 3: figs. 4-9 [Sample 599; G. formosa formosa Zone, lower Eocene, Possagno Section, northern Italy].
Globorotalia (Acarinina) pseudotopilensis (Subbotina).— Hillebrandt, 1962:143-44, pl. 14: figs. 1a-c [Zone G, Reichenhall-Salzburg Basin, Germany].—Blow, 1979:955-958, pl. 110: figs. 2-9 [Zone P6, DSDP Site 47, Shatsky Rise, northwest Pacific Ocean]; pl. 113: figs. 1-6 [Zone P7, Sample RS.80, Kilwa area, Tanzania]; pl. 132: figs. 1-3a [Zone P8b, DSDP Site 47, Shatsky Rise, north-west Pacific Ocean].
Turborotalia pseudotopilensis (Subbotina).—Gohrbandt, 1963:66-67, pl. 3: figs. 13-15 [Zone F, lower Eocene, near Salzburg, Austria].
Truncorotaloides pseudotopilensis (Subbotina).—Jenkins, 1971:135, text-figs. 382-387 [Globorotalia wilcoxensis Zone, Middle Waipara River section, Waipawan Stage, North Island, New Zealand].
Turborotalia (Acarinina) pseudotopilensis (Subbotina).— Samuel and others, 1972:189, pl. 69: figs. 1a-c [lower Eocene G. subbotinae Zone, Hradisko, Hungary].
?Acarinina pseudotopilensis Subbotina.—Lu and Keller, 1995:102, pl. 2. figs. 16, 17 [lower Eocene, Zone P6b, DSDP 577/9/6, 53-55 cm; Shatsky Rise, north-west Pacific Ocean].
Not Acarinina pseudotopilensis Subbotina.—Pearson and others, 1993:124, pl. 1: figs. 13-15 [Zones P11-12, DSDP Site 523, South Atlantic Ocean] ( =Acarinina mcgowrani).

Taxonomic discussion: Acarinina pseudotopilensis was originally described from the Zone of compressed globorotaliids and Zone of conical globorotaliids (roughly equivalent to Zones P4-E6 of this study) in the northern Caucasus (Subbotina, 1953), although all illustrated specimens were from the Eocene part of this range. Test shape/geometry and ornament would seem to place this morphotype between Acarinina wilcoxensis and A. quetra. Blow (1979) indicated a range from Zone P6 to P10 (=E3-E8) but illustrated forms only from (his) Zones P6 to P8b (=Zones E3-E5) and it is in this (bio)stratigraphic interval that this form develops its characteristic morphology. We have not observed morphotypes referable to pseudotopilensis below upper Zone P5 in the course of our studies.
Blow (1979) considered that pseudotopilensis was the stem form of a lineage that led to Acarinina topilensis in the middle Eocene, and he named a new species, praetopilensis, for an intermediate morphology that first appears in Zone P9 (=E7 of this paper) and shows the beginnings of circum-cameral fusion of muricae that is more strongly developed in topilensis. [Berggren et al. 2006]

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: Like A. wilcoxensis but with triangular to wedge- or cuneate-shaped chambers in the final whorl, disjunct (separation of) chamber margins and more densely muricate wall.

Description

Distinguished from Acarinina esnaensis and A. wilcoxensis by its triangular to wedge- or cuneate-shaped chambers in the final whorl, disjunct (separation of) chamber margins and more densely muricate wall; from A. quetra by its less anguloconical test and lack of muricocarina. [Berggren et al. 2006]

Subquadrate to suboval, weakly lobulate outline; 4 inflated chambers in last whorl; umbilical sutures distinct, radial, depressed/incised, with result that chamber contact(s) are disjunct along peripheral margin in some individuals; chambers densely muricate (marked by blunt, triangular muricae), concentrated along periphery but not forming a muricocarina; umbilicus small, deep, in many individuals obscured by overhanging, rounded umbilical shoulder; aperture an umbilical-extraumbilical low arch, extending towards the peripheral margin, bordered in most individuals by a thin lip; 10-12 chambers on spiral side disposed in 2 to 3 whorls; early whorl(s) slightly elevated; chambers tangentially longer than radially broad, meeting at nearly right angles, increasing gradually in size, often assuming a subrectangular shape; final chamber strongly inflated in some individuals and assuming a markedly rectangular or even cuneate/trapezoidal shape; murical development highly variable but concentrated generally along the peripheral margin; discrete, sutural openings visible on some individuals (often obscured by muricae on overhanging edges of previous/adjacent chambers); plano-convex in edge view; spiral side slightly elevated); ventral (umbilical) margin(s) rounded to anguloconical. [Berggren et al. 2006]

Densely muricate, nonspinose, normal perforate. [Berggren et al. 2006]

Biogeography and Palaeobiology

Widely distributed in (sub)tropical regions (Caribbean, North and South Atlantic, Indo-Pacific Oceans, Tethyan region (East, West and North Africa, North Caucasus). [Berggren et al. 2006]
Aze et al. 2011 summary: Low latitudes; based on Berggren et al. (2006b)

Boersma and others (1987) record this species with relatively negative δ18O indicating a shallow water habitat like other acarininids. [Berggren et al. 2006]
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): Boersma et al. (1987)

Evolved from A. wilcoxensis shortly after the first appearance of that species in the latest Paleocene and was ancestral to A. quetra in the early Eocene and A. boudreauxi and A. mcgowrani in the later part of the early Eocene. [Berggren et al. 2006]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within E7a subzone (48.31-50.20Ma, top in Ypresian stage). Data source: Eocene Atlas
First occurrence (base): within E1 zone (55.81-55.96Ma, base in Ypresian stage). Data source: Eocene Atlas

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 305

References:

Berggren, W. A. (1960). Some planktonic foraminifera from the Lower Eocene (Ypresian) of Denmark and northwestern Germany. Stockholm Contributions in Geology. 5: 41-108. gs

Berggren, W. A. (1977a). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In, Ramsay, A. T. S. (ed.) Oceanic Micropaleontology. Academic Press, London 205-300. gs

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 9): 257-326. gs O

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

Gohrbandt, K. (1963). Zur Gliederung des Palaeogen im Helvetikum nordlich Salzburg nach planktonischen Foraminiferen. Mitteilungen der Geologischen Gesellschaft in Wien. 56(1): 63-. 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

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

Krasheninnikov, V. A., Serova, M. Y. & Basov, I. A. (1988). Stratigrafiya I planktonnyie foraminiferyi paleogena: vyisokikh shirot Tikhogo okeana. Trudy Geologicheskiy Institut Akademiya Nauk SSSR. 429: 1-120. gs

Lu, G. & Keller, G. (1995). Planktic foraminiferal faunal turnovers in the subtropical Pacific during the Late Paleocene to Early Eocene. Journal of Foraminiferal Research. 25: 97-116. gs

Luterbacher, H. P. (1975b). Planktonic Foraminifera of the Paleocene and Early Eocene, Possagno Section. Schweizerische Paläontologische Abhandlungen. 97: 57-67. gs

Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1993). Stable isotope paleoecology of middle Eocene planktonic foraminifera and multi-species isotope stratigraphy, DSDP Site 523, South Atlantic. Journal of Foraminiferal Research. 23: 123-140. gs

Reyment, R. A. (1960). Notes on some Globegerinidae, Globotruncanidae and Globorotalidae from the Upper Cretaceous and Lower Tertiary of western Nigeria. Records Geol. Survey Nigeria. 68-86. gs

Samuel, O., Borza, K. & Kohler, E. (1972). Microfauna and lithostratigraphy of the Paleogene and adjacent Cretaceous of the Middle Vah Valley (West Carpathian). Geologicky Ustav Dionyza Stura, Bratislava. 1-264. gs

Snyder, S. W. & Waters, V. J. (1985). Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur Region, Deep Sea Drilling Project Leg 80. Initial Reports of the Deep Sea Drilling Project. 80: 439-472. 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

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs O

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

Warraich, M. Y., Ogasawara, K. & Nishi, H. (2000). Late Paleocene to early Eocene planktic foraminiferal blostratigraphy of the Dungan Formation, Sulaiman Range, central Pakistan. Paleontological Research, Tokyo. 4(4): 275-301, 218 figures, 273 aendices. gs

test outline:	Subquadrate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	Low	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Coarsely muricate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4-4	N.B. These characters are used for advanced search. N/A - not applicable

Acarinina pseudotopilensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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