Jenkinsina triseriata Terquem 1882 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 Jenkinsina triseriata Terquem 1882 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Microperforate, monolamellar,
finely pustulose, lacking pore mounds.
Test morphology: Test small, elongate with a low
apical angle (~35°); sutures depressed, periphery
lobulate; chambers triserial, inflated, spherical,
increasing slowly in size, may be arranged in parallel
rows or with a slight twist, 13-15 chambers forming the
test in about five whorls, umbilicus shallow; aperture a
semi-circular or low, interiomarginal arch open to the umbilicus and extending part to half-way up the final chamber face, bordered by a distinct lip. Size: Maximum length, 0.16 mm, maximum breadth 0.10 mm. |
| Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
Jenkinsina
triseriata differs from Jenkinsina columbiana (Howe)
by (1) its larger size; (2) having five rather than three or
four chamber whorls; and (3) its lower apical angle. It is
similar to Jenkinsina samwelli except for having (1) a
larger, more highly arched aperture; (2) a thicker
apertural lip; and (3) a greater twist to the coiling axis.
DISCUSSION.-
During a visit to study the Terquem
collection at the Musée National d'Histoire Naturelle in
Paris, Jenkins (in Jenkins and others, 1998) determined
that the figured syntype of J. triseriata is a specimen
with the last several chambers broken off, but he could
not find any other specimens of triseriata in remaining
sediments from the now inaccessible type locality at
Vaudancourt (Oise). A sequence at Liancourt St. Pierre
(Oise) that is ll km west of the type locality, but at the
same stratigraphic level, yielded an abundant population
of J. triseriata from which Jenkins and others (1998)
selected a neotype. SEM observations of the neotype
and other specimens from Liancourt revealed an absence
of pore mounds, which provided the basis for transfer
of triseriata from Guembelina into Jenkinsina (Jenkins and others, 1998).
Jenkins and others (1998) agreed with Le Calvez (1970) that Guembelina stavensis Bandy (1949) should be considered a junior synonym of J. triseriata. These authors also placed G. oveyi Ansary (1955) in synonymy under J. triseriata.
PHYLOGENETIC RELATIONSHIPS.-
Evolved from J. columbiana during the early Eocene.
STRATIGRAPHIC RANGE.-
Upper lower to middle
middle Eocene; -Zone E7 through E10. Because of its
small size and taxonomic confusion with other triserial
taxa, the lower latitude stratigraphic range of J. triseriata
has been poorly documented. At high latitudes J.
triseriata first occurs together with Cassigerinelloita
amekiensis at the base of Zone AE4 (Huber and
Quillévéré, 2005) and it last occurs in upper Zone AE7
(Huber, 1991; Li and others, 1992).
GEOGRAPHIC DISTRIBUTION-
Cosmopolitan (for
locations see Li and Radford, 1991). McGowran and
Beecroft (1985) suggested that J. triseriata was a cool water indicator based on its appearance at the same time
as larger, thermophilic benthic foraminifera disappeared
from the southern Australia margin (early middle Eocene). Li and Radford (1992) suggested that this species is an indicator of upwelling.
STABLE ISOTOPE PALEOBIOL0GY.-
No data are
available. |
| Systematics: |
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Guembelitriidae
Species Jenkinsina triseriata
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| Synonym list: |
Pearson et al. (2006):
1882 Textularia triseriata Terquem. - Terquem : p.145 pl. 15; fig. 10 [early-middle Eocene, Liancourt St. Pierre
(Oise), Paris Basin, France]
1949 Guembelitria stavensis Bandy. - Bandy : p.124 pl. 24; fig. 5 [middle Eocene, Little Stave Creek, Clairborne
Group, Tallahatta
Fm., Jackson, Alabama]
1955 Guembelina oveyi Ansary. - Ansary : p.79 pl. 2; fig. 31 [upper
Eocene, Scarp Limestone, Wadi Tayiba, Egypt]
1990 Chiloguembelitria sp. ?. - Stott & Kennett : p.559 pl. 5; fig. 9 [middle Eocene, ODP Site 689, Maud Rise,
Antarctica]
1991 Guembelitria columbiana Howe. - Huber : p.440 pl. 10; fig. 1 [middle Eocene, ODP Site 738, Kerguelen Plateau,
southern Indian Ocean]
1992 Jenkinsina triseriata Terquem. - Li & Radford : p.598 pl. 2; fig. 10-11 [middle Eocene, ODP Site
749, Kerguelen Plateau, southern Indian Ocean]
1998 Jenkinsina triseriata Terquem. - Jenkins et al. : p.66 pl. 2; fig. 1-5, 8-10 [lower Eocene, Wittering
Fm., Selsey, S. England]
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| Specimen: |
Natural History Museum, London, Inventory number: PF 52918
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| References: |
Terquem,O. (1882):
Les Foraminifères de l’Éocène des environs de Paris . Mémoire de la Société Géologique de France p. 1-17
Bandy,O.L. (1949):
Eocene and Oligocene foraminifera from Little Stave Creek, Clarke County, Alabama . Bulletins of American paleontology Vol. 32 p. 1-211
Ansary,S.E.. (1955):
Report on the foraminiferal fauna from the Upper Eocene of Egypt . Publications de l'Institut du Desert d'Egypte Vol. 6 p. 1-160
Stott,L.D. and Kennett,J.P. (1990):
Antarctic Paleogene planktonic foraminifer biostratigraphy: ODP Leg 113, Sites 689 and 690.
In: Proceedings of the Ocean Drilling Program Vol. 113 p. 549-569
Huber,B.T. (1991):
Paleogene and early Neogene planktonic foraminifer biostratigraphy of Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 119 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 427-449
Li,Q. and Radford,S.S.. (1992):
Morphology and affinity of the planktonic foraminifer Cassigerinelloita amekiensis Stolk and reclassification of Cassigerinelloita Stolk.
In: Proceedings of the Ocean Drilling Program, Scientific Results, Ocean Drilling Program Vol. 120 Eds: Wise, J.S.W..Schlich, R..and others p. 595-602
Jenkins,D.G.; Whittaker,J.E. and Curry,D. (1998):
Palaeogene triserial planktonic foraminifera . Journal of Mircopalaeontology Vol. 17 p. 61-70
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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