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Species Acarinina pseudotopilensis Subbotina 1953


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Densely muricate, nonspinose, normal perforate. 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 cuneatel 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. Size: Diameter: 0.35-0.55 mm; thickness: 0.25-0.35 mm (Subbotina, 1953, p. 229); up to 0.46 mm (Berggren, 1 960a, p. 94).
Discussion / Comments:
Van Eijden & Smit (1991):
Remarks. See A. coalingensis (Cushman and Hanna, 1927).
Pearson et al. (2006):
DISTINGUISHING FEATURES.- 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. 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 betwen Acarinina wilcoxensis and A. quetra. Blow (1 979) indicated a range from Zone P6 to P l0 (=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 topseudotopilensis 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. STRATIGRAPHIC RANGE.- Uppermost Paleocene / basal Eocene (uppermost Zone P5 or Zone El) to lower Eocene Zone E7. PHYLOGENETIC RELATIONSHIPS.- 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. 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). STABLE ISOTOPE PALEOBIOL0GY.- Boersma and others (1987)record this species with relatively negative ò18O indicating a shallow water habitat like other acarininids.
Systematics:

32
 Familia Globorotaliidae
  Genus Acarinina
   Species Acarinina pseudotopilensis

35
  Ordo Foraminiferida
   Superfamilia Globigerinaceae
    Familia Truncorotaloididae
     Genus Acarinina
      Species Acarinina pseudotopilensis
Synonym list:
Van Eijden & Smit (1991):
1953 Acarinina pseudotopilensis Subbotina. - Subbotina : p.227 pl. 21, figs. 8-9; pl. 22, figs. 1-3
1991 Acarinina pseudotopilensis Subbotina. - Van Eijden & Smit : p.112
Pearson et al. (2006):
1953 Acarinina pseudotopilensis Subbotina. - Subbotina : pl. 21, fig. Xa-c (holotype) and 9a-c [Zone of conical globorotaliids, Green Fm., Kuban River section, North Caucasus]; pl. 22, figs. 1 a-3c [Zone of conical globorotaliids, Foraminiferal Beds, near Nal'chik, North Caucasus]
1960 Globorotalia pseudotopilensis Subbotina. - Reyment : p. 81, 82 pl. 15, fig. 14a-c [uppermost Paleocene, llaro II Borehole, Nigeria]; pl. 1 5, fig. 15- 17; pl. 16, fig. l a, b [lower Eocene, Otta Borehole, Nigeria]
1960 Globorotalia pseudotopilensis Subbotina. - Berggren : p. 94-96 pl. 11, fig. 4a-c [lower Eocene, east coast island of Fehmarn, north-west Germany]; pl. 12, fig. la-c [Zone NP11-12, lower Eocene, Rogle Klint, Jutland, Denmark]
1962 Globorotalia (Acarinina) pseudotopilensis Subbotina. - Hillebrandt : p. 143-144 pl. 14; fig. 1a-c [Zone G, Reichenhall-Salzburg Basin, Germany]
1963 Turborotalia pseudotopilensis Subbotina. - Gohrbrandt : p. 66-67 pl. 3; fig. 13-15 [Zone F, lower Eocene, near Salzburg, Austria]
1971 Truncorotaloides pseudotopilensis Subbotina. - Jenkins : p.135 text-fig. 382-387 [Globorotalia wilcoxensis Zone, Middle Waipara River section, Waipawan Stage, North Island, New Zealand]
1972 Turborotalia (Acarinina) pseudotopilensis Subbotina. - Samuel et al. : p.189 pl. 69; fig. 1a-c [lower Eocene G. subbotinae Zone, Hradisko, Hungary]
1975 Globorotalia pseudotopilensis Subbotina. - Stainforth et al. : p.217 text-fig. 78.1a-2c (reillustrations from literature), 78.3-6 [lower Eocene, North Caucasus]
1975 Globorotalia pseudotopilensis Subbotina. - Luterbacher : p.65 pl. 3; fig. 4-9 [Sample 599; G. formosa formosa Zone, lower Eocene, Possagno Section, northern Italy]
1977 Acarinina pseudotopilensis Subbotina. - Berggren : p.250 chart no. 10 (reillustrations from the literature)
1979 Globorotalia (Acarinina) pseudotopilensis Subbotina. - Blow : p. 955-958 pl. 1 10, fig. 2-9 [Zone P6, DSDP Site 47, Shatsky Rise, northwest Pacific Ocean]; pl. 113, fig. 1-6 [Zone P7, Sample RS.80, Kilwa area, Tanzania]; pl. 132, fig. 1-3a [Zone P8b, DSDP Site 47, Shatsky Rise, northwest Pacific Ocean]
1985 Acarinina pseudotopilensis Subbotina. - Snyder & Waters : p.446 pl. 6; fig. 17-19 [Zone P7, DSDP Site 549, north-east Atlantic Ocean]
1988 Acarinina pseudotopilensis Subbotina. - Krasheninnikov et al. : p.95 pl. 9, fig. 1, 2 [Globorotalia subbotinae Zone, DSDP Site 43, Campbell Plateau, south-west Pacific Ocean]; pl. 20: figs. 5, 6 [Globorotalia subbotinae Zone, Koryakskoe Hills, Kamchatka, Bering Sea]
non 1993 Acarinina pseudotopilensis Subbotina. - Pearson et al. : p.124 pl. 1; fig. 13-15 [Zones P1 1-12, DSDP Site 523, South Atlantic Occan]; (=Acarinina mcgowrani)
? 1995 Acarinina pseudotopilensis Subbotina. - Lu & Keller : p.102 pl. 2; fig. 16, 17 [lower Eocene, Zone P6b, DSDP 577/916,53-55 cm; Shatsky Rise, north-west Pacific Ocean]
2000 Acarinina pseudotopilensis Subbotina. - Warraich et al. : p.193 fig. 18.15-17 [Zone P7, Dungan Fm., Rakhi Nala River section, Sulaiman Range, Pakistan]
2006 Acarinina pseudotopilensis Subbotina. - Pearson et al. : p.307 pl. 9.18; fig. 1-16 (Plate 9.18: figs. 1-3: reillustration of holotype of Acarinina pseudotopilensis Subbotina)
Was used in synonym list of:
Acarinina mcgowrani Wade & Pearson 2006
Specimen:
VNIGRI collections, St. Petersburg, Inventory number: No. 4123
References:

Subbotina,N.N. (1953):
Iskopaemye foraminifery SSSR (Globigerinidy, Khantkenininidy i Globorotaliidy) . Trudy Vsesoyznogo Nauchno-Issledovatel'skogo Geologo-razvedochnogo Instituta (VNIGRI) Vol. 76 p. 296

Subbotina,N.N. (1953):
Fossil foraminifera of the USSR. Globigerinidae, Hantkeninidae and Globorotaliidae [in Russian] . Trudy Vsesoyuznogo Neftyanogo Nauchno-Isledovatelskogo Geologo-Razvedochnogo Instituta (VNIGRI), Novaya Seriya Vol. 76 p. 1-296

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

Reyment,R.A. (1960):
Notes on some Globigerinidae, Globotruncanidae and Globorotaliidae from the upper Cretaceous and lower Tertiary of western Nigeria . Records of the Geological Survey of Nigeria p. 68-86

Hillebrandt,v.A.. (1962):
Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg . Bayerische Akademie Wissenschaft, Mathematischen-Naturwissenschaften Klasse Vol. 108 p. 188 p.

Gohrbrandt,K.H.A. (1963):
Zur Gliederung des Paleogen im Helvetikum nördlich von Salzburg nach planktonischen Foraminiferen . Geologische Gesellschaft Wien, Mitteilungen Vol. 56

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

Samuel,O..; Borza,K.. and Kohler,E.. (1972):
Microfauna and lithostratigraphy of the Paleogene and adjacent Cretaceous of the Middle Vah Valley (West Carpathian) . Geologicky ustav Dionyza Stura, Bratislava p. 246

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

Stainforth,R.M.; Lamb,J.L.; Luterbacher,H.P.; Beard,J.H. and Jeffords,R.M. (1975):
Cenozoic planktonic foraminiferal zonation and characteristics of index forms . Paleontological ContributionsArticle 62 p. 425

Berggren,W.A. (1977):
Atlas of Paleogene planktonic foraminifera. Some species of the genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides.
In: Oceanic Micropaleontology Eds: Ramsay, A.T.S. p. 205-299

Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp

Snyder,S.W. and Waters,V.J. (1985):
Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur region.
In: Deep Sea Drilling Project Vol. 80

Krasheninnikov,V.A.; Serova,M.Y.A.. and Basov,I.A. (1988):
Stratigrafiya I planktonnyic foraminiferyi paleogena: vyisokikh shirot Tikhogo okeana . Akademiya Nauk SSSR, Trudy Vol. 429 p. 120

Van Eijden,A.J.M. and Smit,J. (1991):
Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 121 Eds: Weissel, J.Peirce, J.Taylor, E.Alt, J. p. 77-123

Pearson,P.N.; Shackleton,N.J. and Hall,M.A. (1993):
The Stable Isotope Paleoecology of Middle Eocene Planktonic Foraminifera and Multi-species integrated Isotope Stratigraphy . Journal of Foraminiferal Research Vol. 23 p. 123-140

Lu,G. and Keller,G. (1995):
Planktic Foraminiferal Faunal Turnovers in the Subtropical Pacific during the Late Paleocene to Early Eocene . Journal of Foraminiferal Research Vol. 25 p. 97-116

Warraich,M.Y..; Ogasawara,K.. and Nishi,H.. (2000):
Late Paleocene to early Eocene planktonic foraminiferal biostratigraphy of the Dungan Formation, Sulaiman Range, Central Pakistan . Paleontological Research Vol. 4 p. 275-301

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
Anonymous: Unedited TaxonConcept data
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