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Species Jenkinsina triseriata Terquem 1882 | ||||||
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| Diagnosis / Definition: | ||||||
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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. |
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| Discussion / Comments: | ||||||
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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. |
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| Systematics: | ||||||
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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]
2006 Jenkinsina triseriata Terquem. - Pearson et al. : p.467 pl. 16; fig. 1-4
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| Specimen: | ||||||
| Natural History Museum, London, Inventory number: PF 52918 |
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| References: | ||||||
Terquem,O. (1882): Bandy,O.L. (1949): Ansary,S.E.. (1955): Stott,L.D. and Kennett,J.P. (1990): Huber,B.T. (1991): Li,Q. and Radford,S.S.. (1992): Jenkins,D.G.; Whittaker,J.E. and Curry,D. (1998): Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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