Acarinina pseudotopilensis


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Acarinina -> Acarinina pseudotopilensis
Sister taxa: << < A. coalingensis, A. collactea, A. cuneicamerata, A. echinata, A. esnaensis, A. esnehensis, A. interposita, A. mcgowrani, A. mckannai, A. medizzai, A. nitida, A. pentacamerata, A. praetopilensis, A. primitiva, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quetra, A. rohri, A. sibaiyaensis, A. soldadoensis, A. strabocella, A. subsphaerica, A. topilensis, A. wilcoxensis,

Taxonomy

Citation: Acarinina pseudotopilensis Subbotina 1953
Rank: Species
Basionym: Acarinina pseudotopilensis
Synonyms:
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]

Catalog entries: Acarinina pseudotopilensis;

Type images:

Short diagnosis: 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.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: 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]

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

Test morphology: 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]

Character matrix

test outline:Subquadratecoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Narrow
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Coarsely muricateaperture:Umbilicalaperture border:N/Aaccessory apertures:Sutural
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Broadly rounded
umb depth:Shallowdiameter mm:width mm:breadth mm:
final-whorl chambers:4.0-4.0

Biogeography and Palaeobiology


Geographic distribution: 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)

Isotope paleobiology: Boersma and others (1987) record this species with relatively negative ∂18O 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 δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): Boersma et al. (1987)

Phylogenetic relations: 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 E7 zone (45.72-50.20Ma, top in Lutetian stage). Data source: Eocene Atlas
First occurrence (base): within E1 zone (55.81-55.96Ma, base in Ypresian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 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(3): 41-108.

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

Berggren, W.A.; Pearson, P.N.; Huber, B.T. & Wade, B.S., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 257-326.

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, 1413 pp.

Gohrbandt, K., (1963). Zur Gliederung des Palaeogen im Helvetikum nordlich Salzburg nach planktonischen Foraminiferen. . Mitt Geol Ges, Wien, 56(1): 63.

Hillebrandt, A., (1962). Das paleozan und seine Foraminiferenfauna im Becken von Reichehall und Salzburg. Abhandlungen Bayerische Akademie der Wissenschaften Mathematisch Naturwissenschaftliche Klasse, 108: 1-182.

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

Krasheninnikov et al 1988 [sorry, not in our bibliography yet]

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.

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

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.

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.

Samuel, O.; Borza, K. & Kohler, E., (1972). Microfauna and lithostratigraphy of the Paleogene and adjacent Cretaceous of the Middle Vah Valley (West Carpathian)

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.

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

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

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, 4(4): 275-301, 18 figures, 3 appendices.


Acarinina pseudotopilensis compiled by the pforams@mikrotax project team viewed: 29-5-2017

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