Pseudohastigerina naguewichiensis Myatliuk 1950 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 | . |
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Species Pseudohastigerina naguewichiensis Myatliuk 1950 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Smooth, normal perforate; in adult
stage wall becomes thickened (gametogenetic calcite?)
and openings to pores are enlarged, giving appearance
of a coarsely perforate wall.
Test morphology: Test small, planispiral, much
compressed, tightly coiled, involute, circular to oval in
outline, slightly lobulate, chambers globular; in umbilical
view 6-8 chambers in ultimate whorl, increasing very
slowly in size, circular to oval in outline, sutures slightly
depressed, straight to slightly curved, umbilicus circular
in shape, inner coil of chambers may be partly visible;
in edge view chambers globular, slightly oval to nearly
circular in outline, primary aperture a moderately high
arch bordered by a thickened prominent lip, test compressed with a rounded periphery, peripheral margin
perforate, some pores closed off by thickened wall.
Size: Maximum diameter of holotype 0.20 mm,
thickness 0.09 mm. |
| Discussion / Comments: |
Toumarkine & Luterbacher (1985):
This very small species (diameter 0.2 mm) differs from P. micra by its smaller size, the numerous chambers in the last whorl (often 8), the straighter sutures and rounder periphery.
P. naguewichiensis and P. barbadoensis (Fig. 21.17) are very close. P. naguewichiensis has possibly a more lobate equatorial outline and is less tightly coiled than P. barbadoensis. As the two species have the same stratigraphic range, we include P. barbadoensis in the variability of P. naguewichiensis.
Van Eijden & Smit (1991):
Remarks. This species occurs only rarely outside of the <125-ìm fraction, usually in the lower Oligocene.
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
Pseudohastigerina
naguewichiensis is characterized by its small size, much
compressed test, circular in umbilical view; globular
chambers which increase very slowly in size, and the
appearance of a coarsely perforate test in adult tests.
DISCUSSION.-
Blow (1979) regarded Pseudohastigerina
barbadoensis Blow as a subspecies of P.
naguewichiensis (Myatliuk) and separated the two
morphotypes on the basis of more embracing chambers
and more common "pore pits" in P. barbadoensis. The
"pore pits" are enlarged openings to pores that are located
at the base of a thickened wall in adult specimens. They
are probably the result of the individual maintaining
access to pores during deposition of this outer layer,
which may be due to deposition of gametogenetic calcite
or a calcite crust in the terminal stage of the life cycle.
Less heavily encrusted individuals do not exhibit as
many enlarged openings to the pores and the chambers
are smooth with cylindrical pore openings. The degree
to which chambers embrace one another would seem to
fall within a normal range of variation for a species and
it is difficult to separate two morphotypes dn this basis
alone. For this reason we treat P. barbadoensis as a junior
synonym of P. naguewichiensis.
PHYLOGENETIC RELATIONSHIPS.-
Pseudohastigerina
naguewichiensis evolved from P. micra by
a decrease in size of the test, an increase in the number
of chambers in the final whorl, and a decrease in the
rate of chamber size increase in the ultimate whorl. The
thickening of the wall in the terminal adult stage may
indicate a change in its habitat in the water column.
STRATIGRAPHIC RANGE.-
Zone E15 to O1.
GEOGRAPHIC DISTRIBUTION.-
Global in low to mid latitudes.
STABLE ISOTOPE PALEOBIOLOGY.-
Poore and
Matthews (1984) recorded relatively negative oxygen
isotopes for this species indicating a surface water habitat
like other Pseudohastigerina. |
| Systematics: |
15
Classis Foraminifera
Genus Pseudohastigerina
Species Pseudohastigerina naguewichiensis
22
32
Ordo Foraminiferida
Familia Hantkeninidae
Genus Pseudohastigerina
Species Pseudohastigerina naguewichiensis
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Hedbergellidae
Genus Pseudohastigerina
Species Pseudohastigerina naguewichiensis
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| Synonym list: |
Toumarkine & Luterbacher (1985):
Van Eijden & Smit (1991):
Spezzaferri & Silva (1990):
Pearson et al. (2006):
1969 Pseudohastigerina naguewichiensis Myatliuk. - Blow : p.377 pl. 53; fig. 2, 3 [Oligocene Zone P1 8, Red Bluff
Clay type locality, Mississippi (originally stated as
Alabama)]
1969 Pseudohastigerina barbadoensis Blow. - Blow : p.409 pl. 53, fig.
7-9 (fig. 7, 8 holotype; fig. 9 paratype)[Oligocene Zone P19, Cipero Fm., southern Trinidad];
pl. 54, fig. 1-3, paratypes [Oligocene Zone P19, Cipero Fm., southern Trinidad]
1979 Pseudohastigerina naguewichiensis barbadoensis Blow. - Blow : p.1190 pl. 53, fig. 7-9;
pl. 54, fig. 1-3 (reproduction of Blow, 1969, pl. 53, fig. 7-9; pl. 54, fig. 1-3);
pl. 246, fig. 2, 6 [Oligocene Zone Pl8, DSDP, Site 14, South Atlantic Ocean];
pl. 246, fig. 7 [Oligocene Zone P18, base of Red Bluff Clay type locality, Mississippi]
1985 Pseudohastigerina naguewichiensis Myatliuk. - Toumarkine & Luterbacher : p.119 fig. 21.10a, b (reillustration of holotype);
fig. 21.ll, 12 [lower Oligocene Marnes a Foraminiferes, Vacherie, Haute-Savoie, France]; fig. 21.13-16 (13, 16 reillustration of Toumarkine, 1975; pl 3; figs. 13, 14 identified as
Pseudohastigerina barbadoensis Blow) [Oligocene Zone PI 8, DSDP Site 313, Central Pacific Ocean]
1991 Pseudohastigerina naguewichiensis Myatliuk. - Spezzaferri & Premoli Silva : p.257 pl. 14; fig. 1a-2c, 5a-c [Oligocene Zone P 19, DSDP Hole 538A, Gulf of
Mexico]
1991 Pseudohastigerina barbadoensis Blow. - Spezzaferri & Premoli Silva : p.257 pl. 13; fig. 3a-b [Oligocene Zone P19, DSDP Hole 538A, Gulf
of Mexico]
1994 Pseudohastigerina barbadoensis Blow. - Nishi & Chaproniere : p.259 pl. 1; fig. 28, 29 [upper Eocene, ODP Hole 841B, Tonga Trench,
South Pacific Ocean]
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| Specimen: |
VNIGRI collections, St. Petersburg, Inventory number: 2321
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| References: |
Myatliuk,E.V. (1950):
The stratigrahy of the flysch deposits of the northern Carpathian Mountains according to the foraminiferal faunas.
In: Microfauna of the USSR, Trudy VNIGRI, new series Vol. 51 p. 225-287
Subbotina,N.N. (1953):
Iskopaemye foraminifery SSSR (Globigerinidy, Khantkenininidy i Globorotaliidy) . Trudy Vsesoyznogo Nauchno-Issledovatel'skogo Geologo-razvedochnogo Instituta (VNIGRI) Vol. 76 p. 296
Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422
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
Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34
Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp
Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154
Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263
Spezzaferri,S. and Premoli Silva,I. (1991):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263
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
Nishi,H.. and Chaproniere,G.C.H. (1994):
Eocene-Oligocene subtropical planktonic foraminifers at Site 841.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 135 Eds: Hawkins, J..Parson, L..Allan, J..others p. 245-266
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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