Jenkinsina triseriata


Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae -> Jenkinsina -> Jenkinsina triseriata
Sister taxa: J. triseriata, J. columbiana, J. sp.

Taxonomy

Citation: Jenkinsina triseriata (Terquem 1882)
Rank: Species
Basionym: Guembelitria triseriata
Synonyms:
Taxonomic discussion:

Following Jenkins and others (1998), Guembelina stavensis Bandy is here considered as a junior synonym of J. triseriata which extends its known stratigraphic range beyond the Eocene occurrences noted by Huber and others (2006) into the Oligocene. Jenkins (1978b) also described Jenkinsina samwelli, which occurs only in New Zealand and the Southern Hemisphere. After study of the figured specimens, we assign the holotypes and all paratypes on plate 1 to Jenkinsina triseriata, with the exception of the paratype specimen on fig. 7, which is considered to be J. columbiana. See Huber and others (2006) for more remarks on this species. [Premec Fucek et al. 2018]

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 11 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. [Huber et al. 2006]

Catalog entries: Textilaria triseriata, Guembelitria oveyi, Guembelitria stavensis, Guembelitria samwelli

Type images:

Distinguishing features: Like J. columbiana but larger; with 5 vs. 3-4 chamber whorls; lower apical angle. 

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Wall type: Microperforate, smooth to finely pustulose, lacking pore mounds. [Premec Fucek et al. 2018]

Morphology: Test small, elongate, triangular with an apical angle from 40-50°; periphery lobulate, chambers globular and inflated, up to ١٥ forming the triserial test in about five whorls, slightly twisted about the coiling axis, increasing slowly in size; sutures depressed, 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. [Premec Fucek et al. 2018]

Size: Maximum length 0.18 mm, maximum breadth 0.10 mm. [Premec Fucek et al. 2018]

Character matrix

test outline:Triangularchamber arrangement:Triserialedge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:N/Acoiling axis:N/Aperiphery:N/Aaperture border:Thick lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:N/Aumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-3.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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 (1991) suggested that this species is an indicator of upwelling. [Huber et al., 2006]

Isotope paleobiology: No data are available. [Premec Fucek et al. 2018]

Phylogenetic relations: Evolved from J. columbiana during the early Eocene. [Premec Fucek et al. 2018]

Most likely ancestor: Jenkinsina columbiana - at confidence level 3 (out of 5). Data source: Huber et al 2006; Premec Fucek et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: Upper lower Eocene (Zone E7) through upper Oligocene (Zone O5). McGowran (2009, fig. 6) uses the HO of J. triseriata as a secondary bioevent to recognize the base of Zone O2 in southern Australia. [Premec Fucek et al. 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Premec Fucek et al. 2018
First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Huber et al 2006

Plot of occurrence data:

Primary source for this page: Premec Fucek et al. 2018 - Olig Atlas chap.17 p.476; Huber et al. 2006 - Eocene Atlas, chap. 16, p. 469

References:

Ansary, S. E. (1955). Report on the foraminiferal fauna from the Upper Eocene of Egypt. Publications de l'Institut du Désert d'Egypte. 6: 1-160. gs

Bandy, O. L. (1949). Eocene and Oligocene foraminifera from Little Stave Creek, Clarke County, Alabama. Bulletins of American Paleontology. 32(131): 1-210. gs

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. gs V O

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 16): 461-508. gs V O

Jenkins, D. G. & Srinivasan, M. S. (1986). Cenozoic planktonic foraminifera from the equator to the sub-antarctic of the Southwest Pacific. Initial Reports of the Deep Sea Drilling Project. 90: 795-834. gs V O

Jenkins, D. G. (1974). Paleogene planktonic foraminifera of New Zealand and the Austral Region. Journal of Foraminiferal Research. 4(4): 155-170. gs

Jenkins, D. G. (1978). Guembelitria samwelli Jenkins, a new species from the Oligocene of the Southern Hemishere. Journal of Foraminiferal Research. 8(2): 132-137. gs

Jenkins, D. G., Whittaker, J. E. & Curry, D. (1998). Palaeogene triserial planktonic foraminifera. Journal of Micropalaeontology. 17: 61-70. gs

Le Calvez, Y. (1970). Contribution a l’étude des foraminifères paléogènes du Bassin de Paris. CNRS, Paris. 1-326. gs

Li, Q. & Radford, S. S. (1991). Evolution and biogeography of Paleogene microperforate planktonic foraminifera. Palaeogeography Palaeoclimatology Palaeoecology. 83: 87-115. gs

Li, Q. & Radford, S. S. (1992). Morphology and affinity of the planktonic foraminifer Cassigerinelloita amekiensis Stolk and reclassification of Cassigerinelloita Stolk. Proceedings of the Ocean Drilling Program, Scientific Results. 120: 595-602. gs

Li, Q., Radford, S. S. & Banner, F. T. (1992). Distribution of microperforate tenuitellid planktonic foraminifers in Holes 747A and 749B, Kerguelen Plateau. Proceedings of the Ocean Drilling Program, Scientific Results. 120: 569-594. gs V O

Malumian, N., Jannou, G. & Náñez, C. (2009). Serial planktonic foraminifera from the Paleogene of the Tierra del Fuego Island, South America. Journal of Foraminiferal Research. 39: 316-321. gs

McGowran, B. J. & Beecroft, A. (1985). Guembelitria in the early Tertiary of southern Australia and its palaeoceanographic significance. In, Lindsay, J. M. (ed.) Stratigraphy, Palaeontology and Malacology, Papers in Honour of N.H. Ludbrook. South Australian Dept Mines & Energy, Special Publication, v. 5, 247-261. gs

McGowran, B. J. (2009). The Australo-Antarctic Gulf and the Auversian facies shift, in Koeberl, C., and Montanari, A. (eds.), The Late Eocene Earth--Hothouse, Icehouse and Impacts;. Geological Society of America, Special Papers. 452: 215-240. gs

Nocchi, M., Amici, E. & Premoli Silva, I. (1991). Planktonic foraminiferal biostratigraphy and paleoenvironmental interpretation of Paleogene faunas from the subantarctic transect, Leg 114. Proceedings of the Ocean Drilling Program, Scientific Results. 114: 233-273. gs

Premec Fucek, V., Hernitz Kucenjak, M. & Huber, B. T. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Chiloguembelina and Jenkinsina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 17): 459-480. gs V O

Stott, L. D. & Kennett, J. P. (1990). The Paleoceanographic and Paleoclimatic signature of the Cretaceous/Paleogene boundary in the Antarctic: Stable isotopic results from ODP Leg 113. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 829-848. gs

Terquem, O. (1882). Les foraminiferes de l’Eocene des environs de Paris. Mémoires de la Société Géologique de France. 2(3): 1-193. gs V O


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Jenkinsina triseriata compiled by the pforams@mikrotax project team viewed: 8-3-2021

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