Acarinina topilensis Cushman 1925 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 | . |
Notice: This catalogue page may contain unedited data.
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Species Acarinina topilensis Cushman 1925 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Strongly muricate, nonspinose,
normal perforate.
Test morphology: Subquadrate, lobulate
peripheral outline; 3 1/2-4 1/2 chambers on umbilical side,
increasing rapidly in size, laterally angulate, ante- and
penultimate chamber(s) strongly flattened along
peripheral margin giving distinctly cuneate or mitriform
shape; sutures strongly incised, radial and straight to
weakly curved depending on degree of compression of
adjacent chambers resulting in disjunctlincised chamber
separation; umbilicus narrow, deep; aperture a raised,
umbilical-extraumbilical arch bordered by a thin lip;
approximately 10 chambers in 2-2 1/2 whorls on spiral
side; chambers elongate, lunate/semicircular, last
chamber often wedge shaped/cuneate; sutures curved,
depressed; peripheral margin marked by concentration
of (on some individuals large, blunt) muricae;
"supplementary" apertures, bordered by raised rims,
visible along spiral suture margin(s); planoconvex in
edge view; early chambers of last whorl subrounded to
subacute, (pen)ultimate chambers strongly
anguloconical.
Size: Maximum diameter of holotype 0.34 mm,
thickness 0.24 mm. |
| Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
Distinguished by
its distinctly inflated, anguloconical, 'truncorotaloid'
chambers and strongly compressed, angulate and
disjunct (ante)penultimate chamber(s) rimmed by thick,
blunt circum-cameral muricocarinae and sutural
"supplementary" apertures on spiral side.
DISCUSSION.-
Originally described from the middle
Eocene of Mexico, this taxon has since been shown to
have an essentially global (sub)tropical distribution. With
its distinctly angulo-conical test, disjunct
(ante)penultimate chamber margins, wedgelcuneate
shaped and strongly muricate terminal chamber(s),
"supplementary" apertures along spiral sutural margins
and relatively short stratigraphic range, it is one of the
most distinctive middle Eocene taxa.
The main question regarding this taxon is its
ancestry which bears in turn upon the limits of variability
and stratigraphic range of possible ancestral
morphotypes. Blow (1979, p. 1043-1045) created the
taxon G. (T.) topilensis praetopilensis (said to have
evolved from Acarinina pseudotopilensis) and viewed
it as directly ancestral to topilensis. Differentiation was
made primarily on the basis of the more involute coiling
pattern, smaller umbilicus, less well developed murical
ornament along the peripheral margin of the later
chambers, and less well developed/pronounced chamber
separation in the (ante)penultimate chambers.
Pearson (1990) and Pearson and others (1993,
p. 124) viewed the evolution of this taxon in a similar
fashion except that pseudotopilensis, rather than Blow's
praetopilensis, was viewed as the direct ancestor of
topilensis. Reference to Pearson and others (1993, pl. 1,
figs. 13- 15) shows that their concept of pseudotopilensis
is closer to Blow's (1979, pl. 178, figs. 6-9; pl. 169, figs.
1-7, 9, and, in particular, 8 [=holotype] praetopilensis
andlor Acarinina mcgowrani n. sp., are distinctly
different from Subbotina's (1953, pl. 21, figs. 8a-c
[=holotype], 9a-c; pl. 22, figs. la-2c) pseudotopilensis
from the Zone of conical globorotaliids (=Zones P6b-8
of Berggren and others, 1995). Pearson (1990) made
the observation that the strongly anguloconical
(truncorotaloid) character of the last chamber arises only
in fully adult specimens (being absent in smaller size
fractions) so that when the last chamber is lost or broken
this taxon is indistingushable from 'pseudotopilensis".
(We would agree except that we believe it is with
praetopilensis that differentiation should be made.) The
taxon pseudotopilensis has its FAD in Zone El and does
not range into stratigraphic levels as high as Zones P1 1-12 (=E9-1 I) from which "pseudotopilensis" of Pearson
and others (1993) was illustrated.
PHYLOGENETIC RELATIONSHIPS.-
Evolved from
Acarininapraetopilensis in E1 0 and gave rise to A. rohri.
STRATIGRAPHIC RANGE.-
Zone E1 0 to mid Zone
E12.
GEOGRAPHIC DISTRIBUTION.-
Widely distributed
in the Caribbean, North and South Atlantic, Indo-Pacific
and Tethyan/Mediterranean regions; rare in North
Caucasus sections.
STABLE ISOTOPE PALEOBIOLOGY-
Oxygen and
carbon isotope evidence suggests a mixed layer habitat
(Pearson and others, 2001). Boron isotope data (Pearson
and Palmer, 1999) supports this interpretation. |
| Systematics: |
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Truncorotaloididae
Genus Acarinina
Species Acarinina topilensis
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| Synonym list: |
Pearson et al. (2006):
1925 Globigerina topilensis Cushman. - Cushman : p.7 pl. 1; fig. 9a-c [middle Eocene, Tantoyuca Fm., Vera Cruz, Mexico]
1939 Globigerina topilensis Cushman. - Howe : p.84 pl. 12; fig. 1-3 [middle Eocene, Claiborne
1 Cook Mountain Fm., Louisiana]
1955 Globigerina topilensis Cushman. - Weiss : p. 309, 310 pl. 2; fig. 16, 17 [middle Eocene, Chira Fm., Verdun-
Chira Group, north-west Peru]
1957 Truncorotaloides topilensis Cushman. - Bolli : p.170 pl. 39; fig. 13-16b [middle Eocene Porliculasphaera
mexicana Zone, Navet Fm., Trinidad]
1959 Globigerina topilensis Cushman. - Hamilton & Rex : p.792 pl. 252; fig. 17, 21 [middle Eocene, Sylvania
Guyot, Marshall Islands, west Pacific Ocean]
1962 Truncorotaloides topilensis Cushman. - Saito : p. 215-216 pl. 33; fig. 8a-c [middle Eocene, Haha-Jima, Bonin
Islands, western Pacific Ocean]
1962 Globorotalia topilensis Cushman. - Aubert : p. 60-61 pl. 4; fig. 5a-c [middle Eocene, Sidi-Ameur-el-Hadi,
Northern Morocco]
1971 Truncorotaloides topilensis Cushman. - Jenkins : p.136 text-fig. 388-391 [middle Eocene
Globigerapsis index Zone, Hampden Beach section, South
Island, New Zealand]
1975 Truncorotaloides topilensis Cushman. - Toumarkine : p.738 pl. 743; fig. 12 [middle Eocene
Globorotalia lehneri Zone, DSDP Site 3 13, South Atlantic
Ocean]
1975 Truncorotaloides topilensis Cushman. - Stainforth et al. : p.234 text-fig. 91.1a-4 (reillustration of Bolli, 1957b, pl. 39: figs. 13-16c)
1983 Truncorotaloides topilensis Cushman. - Pujol : p.642 pl. 5; fig. 10-11 [middle Eocene Zone Pll-12, DSDP Hole 516F,
Rio Grande Rise, South Atlantic Ocean]
1985 Truncorotaloides topilensis Cushman. - Snyder & Waters : p.443 pl. 5; fig. 13-15 [middle Eocene Zone
P1 3, DSDP Hole 548A, north-east Atlantic Ocean]
1985 Truncorotaloides libyaensis El Khoudary. - Toumarkine & Luterbacher : p.132 fig. 32.4-6 (reillustration of type series);
33.8-9 [middle Eocene, Beni Mazar, Nile Valley,
Egypt, from Boukhary, Toumarkine and Khalifa, 1982]
1991 Truncorotaloides topilensis Cushman. - Miller et al. : [upper Eocene Zone P1 5
(reworked), DSDP Site 612, New Jersey continental slope,
north-west Atlantic Ocean]
2006 Acarinina topilensis Cushman. - Pearson et al. : p.315 pl. 9.22; fig. 1-16 (PI. 9.22, Figs. 1-3: new SEMs of holotype of
Globigerina topilensis Cushman)
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| Specimen: |
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM CC 4335
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| References: |
Cushman,J.A. (1925):
An Eocene fauna from the Moctezuma River, Mexico. . Bull. Am. Assoc. Petrol. Geol. Vol. 9 p. 298-303
Howe,H.V. (1939):
Louisiana Cook Mountain Eocene Foraminifera. Louisiana Dep. Cons. . Geol. Surv. Bull. Vol. 14 p. 1-122
Weiss,L. (1955):
Foraminifera from the Paleocene Pale Greda Formation of Peru . Journal of Paleontology Vol. 29 p. 1-21
Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172
Hamilton,E.L. and Rex,R.W. (1959):
Lower Eocene phosphatized Globigerina ooze from Sylvania buyot. . U. S. Geological Survey Professional Paper p. 785-798
Bermudez,P.J. (1961):
Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleocene-Reciente).
In: Boletino Geologia (Venezuela), Special Publicacion Vol. 3
Aubert,J.. (1962):
Les Globorotalia de la region prerifaine (Maroc septentrional) . Notes et Memoires du Service Geologique Maroc Vol. 22 p. 1-156
Saito,T. (1962):
Eocene planktonic foraminifera from Hahajima (Hillsborough Island) . Trans. Proc. Paleontol. Soc. Japan, news series Vol. 45 p. 209-225
Samanta,B.K. (1970):
Middle Eocene Planktonic Foraminifera from Lakhpat, Cutch, Western India . Micropaleontology Vol. 16
Jenkins,D.G. (1971):
New Zealand Cenozoic Planktonic Foraminifera . New Zealand Geological Survey Paleontological Bulletin Vol. 42
Postuma,J.A. (1971):
Manual of Planktonic Foraminifera. p. 422 pp
Samuel,O.. (1972):
New species of planktonic foraminifers from the Paleogene of the west Carpathian in Slovakia (Czechoslovakia) . Zbornik Geologick"ck Vied Západné Karpaty Vol. 17 p. 165-221
Toumarkine,M. (1975):
Middle and Late Eocene planktonic foraminifera from the northwestern Pacific, Leg 32 of the Deep Sea Drilling Project.
In: Initial Reports of the Deep Sea Drilling Project Vol. 32 Eds: Larson, R.L.Moberly, R. p. 735-751
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
El Khoudary,R.H.. (1977):
Truncatulinoides libyaensis, a new planktonic foraminifer from Jabal Al Akhdar (Libya) . Revista Espanol de Micropaleontologia Vol. 9 p. 327-336
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
Pujol,C. (1983):
Cenozoic Planktonic Foraminiferal Biostratigraphy of the Southwestern Atlantic (Rio Grande Rise): Deep Sea Drilling Project Leg 72.
In: Initial Reports of the Deep Sea Drilling Project Vol. 72 Eds: Barker, P.F.Johnson, D.A. p. 623-673
Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154
Snyder,S.W. and Waters,V.J. (1985):
Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur region.
In: Deep Sea Drilling Project Vol. 80
Miller,K.G.; Berggren,W.A.; Zhang,J.. and Palmer-Julson,A.A.. (1991):
Biostratigraphy and Isotope Stratigraphy of Upper Eocene microtektites at Site 61 2: How many impacts? . Palaios Vol. 6 p. 17-38
Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
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