Pseudohastigerina naguewichiensis Myatliuk 1950 (TaxonConcept

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Species Pseudohastigerina naguewichiensis Myatliuk 1950

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

Synonym list:

Toumarkine & Luterbacher (1985):

1950 Globigerinella naguewichiensis Myatliuk. - Myatliuk : p.281 pl 4 figs 4a-b (type reference)

1969 Pseudohastigerina barbadoensis Blow. - Blow : p.409 pl 53 figs 7-9

1985 Pseudohastigerina naguewichiensis Myatliuk. - Toumarkine & Luterbacher : p.119 figs 21.10-16

Van Eijden & Smit (1991):

1950 Globigerinella naguewichiensis Myatliuk. - Myatliuk : p.281 pl. 4, figs. 4a-b

1991 Pseudohastigerina naguewichiensis Myatliuk. - Van Eijden & Smit : p.115

Spezzaferri & Silva (1990):

1950 Globigerinella naguewichiensis Myatliuk. - Myatliuk :

1985 Globigerinella naguewichiensis Myatliuk. - Toumarkine & Luterbacher : fig. 21 (10-16)

1990 Pseudohastigerina naguewichiensis Myatliuk. - Spezzaferri & Silva : p.255 pl. XIV; fig. 1a-c, 2a-b, 5a-c

Pearson et al. (2006):

1950 Globigerinella naguewichiensis Myatliuk. - Myatliuk : p.281 pl. 4; fig. a, b [Oligocene, Chechva River, Lopanetskie layer, western Ukraine]

1953 Globigerinella naguewichiensis Myatliuk. - Subbotina : p.124 pl. 13; fig. 18a, b [reillustration of holotype]

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]

1975 Pseudohastigerina barbadoensis Blow. - Toumarkine : p.746 pl. 3; fig. 13, 14 [Oligocene Zone P18, DSDP Site 313, Central Pacific Ocean]

1979 Pseudohastigerina naguewichiensis Myatliuk. - Blow : p.1189 pl. 53; fig. 2, 3 (reproduction of Blow, 1969, pl., 53: figs. 2, 3)

1979 Pseudohastigerina naguewichiensis naguewichiensis Myatliuk. - Blow : p.1189 pl. 246; fig. 1 [Oligocene Zone Pl8, DSDP Site 14, South Atlantic Ocean], fig. 3, 4 [Oligocene Zone P18, base of Red Bluff Clay, type locality, Mississippi]

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]

2006 Pseudohastigerina naguewichiensis Myatliuk. - Pearson et al. : p.425 pl. 14.3; fig. 1-10

Quilty (1976):

1950 Pseudohastigerina naguewichiensis Myatliuk. - Myatliuk : p.281 pl. 4, figs. 4a-b

1976 Pseudohastigerina naguewichiensis Myatliuk. - Quilty : p.703 pl. 19, fig. 7

Specimen:

VNIGRI collections, St. Petersburg, Inventory number: 2321

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

Anonymous: Unedited TaxonConcept data

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