Globoturborotalita nepenthes


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita nepenthes
Sister taxa: G. tenella, G. rubescens, G. decoraperta, G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi, G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides, G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, G. martini, G. ouachitaensis, G. sp.,

Taxonomy

Citation: Globoturborotalita nepenthes (Todd 1957)
Rank: species
Basionym: Globigerina nepenthes
Synonyms:

Glohigerina (Zeaglohigerina) nepenthes

Variants:

Catalog entries: Globigerina nepenthes, Globigerina picassiana, Globigerina nepenthes delicatula

Type images:

Distinguishing features: Like G. druryi but with protruding thumb-shaped final chamber

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


Diagnostic characters: Compactly coiled except for last-formed protuding chamber, low to high spire

Aperture: Broad arch at the umbilical edge of the final chamber bordered by thickened rim [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test compactly coiled except for the last-formed protruding chamber, low to high spire, chambers indistinct, slightly inflat- ed, four in the final whorl; sutures obscured on earlier chambers due to test thickening, radial to slightly curved on later chambers, slightly depressed. Surface cancellate with distinct pore pits and interpore ridges. Aperture a broad arch at the umbilical edge of the protruding final chamber, bordered by a thickened rim. [Kennett & Srinivasan 1983]

Character matrix

test outline:Ovatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Moderateperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on ∂13C lighter than species with symbionts; also with relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): D. R. M. Stewart unpublished data

Phylogenetic relations: Gg. (Zg.) nepenthes differs from its ancestor Gg. (Zg.) druryi primarily in its protruding thumb-shaped final chamber. The characteristic cancellate surface and apertural rim suggest its placement within the subgenus Zeaglobigerina. Gg. (Zg.) nepenthes exhibits a wide range of variation in size and shape of the final chamber, and test thickening, which resulted in the erection of several new species and subspecies such as Globigerina picassiana Perconig, 1968 and Globigerina nepenthes delicatula Bronnimann and Resig, 1971. They are here considered to be phenotypic variants of Gg. (Zg.) nepenthes. [Kennett & Srinivasan 1983]

Most likely ancestor: Globoturborotalita druryi - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, Hayashi et al. 2013 - however Aze et al. (2011) remove G. druryi from Globotuborotalita and derive G. nepenthes directly from G. woodi. .

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of PL1 [Atl.] zone (100% up, 4.4Ma, in Zanclean stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): at base of M11 zone (0% up, 11.6Ma, in Serravallian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.48

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Brönnimann, P. & Resig, J. (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Initial Reports of the Deep Sea Drilling Project. 7(2): 1235-1469. gs

Keller, B. M. & Poore, R. Z. (1980). Globigerinoides kennetti, a new Late Miocene to earliest Pliocene planktonic foraminifer from the Atlantic and Pacific oceans. Micropaleontology. 26(2): 189-192. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Perconig, E. (1968). Nuove specie di foraminiferi planctonici della Sezione di Carmona (Andalusia, Spagna). Committee Mediterranean Neogene Stratigraphy. 35(3): 219-232. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Todd, R. (1957). Smaller foraminifera, in Geology of Saipan, Mariana Islands, Pt. 3, Paleontology. U. S. Geological Survey, Professional Paper. 280-H: 265-320. gs


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Globoturborotalita nepenthes compiled by the pforams@mikrotax project team viewed: 17-10-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104155 Go to Archive.is to create a permanent copy of this page - citation notes



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