Globoconusa daubjergensis


Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae -> Globoconusa -> Globoconusa daubjergensis
Sister taxa: G. victori, G. daubjergensis, G. sp.

Taxonomy

Citation: Globoconusa daubjergensis (Bronnimann 1953)
Rank: Species
Basionym: Globigerina daubjergensis
Synonyms:
Taxonomic discussion: The morphology of G. daubjergensis has been described in detail by several authors (Bronnimann, 1953; Loeblich and Tappan, 1957a; Troelsen, 1957; Blow, 1979). Troelsen (1957:120) recognized two forms as end-member morphologic variants of Globigerina daubjergensis Bronnimann, noting that the two variants "grade imperceptibly into each other." One of these contains four chambers in each whorl, whereas the other is a three-chambered form (Eoglobigerina trifolia Morozova, 1961, Globigerina tripartita Morozova et al., 1967, and Globastica sp. Type 1 of Blow, 1979). Blow (1979:1244) suggested that the three-chambered form "is one of three later differentiates from the basic Globastica daubjergeHSW-morphotype." Close examination of lowermost Paleocene sequences, however, suggests that the first appearance of the three-chambered morphotype preceded that of the four-chambered morphotype (D'Hondt and Keller, 1991).
Some specimens assigned to the three-chambered morphotype appear morphologically intermediate between Guembelitria cretacea and Globoconusa daubjergensis (Plate 63: Figures 7-9). The existence of such intermediate forms in lowermost Paleocene sediments has often been interpreted to demonstrate the evolution of G. daubjergensis from G. cretacea (Olsson, 1970, 1982; Premoli Silva, 1977; Smit, 1977, 1982; Li and Radford, 1991; Liu and Olsson, 1992).
Blow (1979:1235) suggested that G. daubjergensis, G. daubjergensis gigantea, and G. kozlowskii should probably be considered as only subspecifically related. Bang (1969) proposed the subspecies designation Globoconusa daubjergensis gigantea for morphotypes of G. daubjergensis that are marked by an umbilical bulla and secondary bullae in intercameral sutures. The holotype illustration of Globigerina kozlowskii Brotzen and Pozaryska (1961) has a higher initial spire and tighter coiling mode than the holotype of G. daubjergensis. Nonetheless, the former falls within the range of morphologic variability of the latter. Hence, G. kozlowskii is a junior synonym of G. daubjergensis.
Recrystallization renders the holotype of Postrugoglobigerina praedaubjergensis Salaj difficult to unambiguously identify (Salaj, 1986, pl. 3: fig. 7); however, Salaj (1986) considered Postrugoglobigerina praedaubjergensis immediately ancestral to G. daubjergensis, and the only other illustrated specimen assigned to P. praedaubjergensis is a Globoconusa daubjergensis specimen (Salaj, 1986, pl. 3: figs. 8, 9). [Olsson et al. 1999]

Catalog entries: Globigerina daubjergensis, Globigerina (Eoglobigerina) trifolia, Globoconusa conusa, Globigerina kozlowskii, Globoconusa tripartita, Globoconusa daubjergensis gigantea

Type images:

Distinguishing features: Test tiny, low to high trochospire of 2-2½ whorls; each whorl with 3-4 inflated, subglobular chambers. Aperture umbilical, a very small, low arch. Sometimes small supplementary apertures on spiral side.

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

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Highperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Pore moundsshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Globoconusa daubjergensis was abundant in high-latitude and near-shore planktonic foraminiferal assemblages (Troelsen, 1957; Keller, 1989; Premoli Silva and Boersma, 1989; Liu and Olsson, 1992). It was rare in low-latitude open-marine environments ( Premoli Silva and Boersma, 1989; D'Hondt and Keller, 1991; Liu and Olsson, 1992) (Figure 32). [Olsson et al. 1999]

Isotope paleobiology: Although its abundance in near-shore sequences indicates a near-surface planktic habitat (Troelsen, 1957; Keller, 1989; Liu and Olsson, 1992), its oxygen isotopic signature and open-marine abundance patterns suggest a preference for relatively cool water masses ( Premoli Silva and Boersma, 1989; D'Hondt and Keller, 1991; Liu and Olsson, 1992; D'Hondt and Zachos, 1993). [Olsson et al. 1999]

Phylogenetic relations: Globoconusa daubjergensis is considered to be a direct descendent of Guembelitria cretacea (Bang, 1969; Olsson, 1970, 1982; Premoli Silva, 1977; Smit, 1977, 1982; Li and Radford, 1991; Liu and Olsson, 1992). [Olsson et al. 1999]

Most likely ancestor: benthic ancestor - at confidence level 3 (out of 5). Data source: Olsson et al. 1999 fig6, Koutsoukos 2014, fig16.
Likely descendants: Globoconusa victori;

Biostratigraphic distribution

Geological Range:
Notes: Basal Zone Pa to Zone Pic. [Olsson et al. 1999]
Last occurrence (top): within P1c subzone (62.60-63.90Ma, top in Danian stage). Data source: Olsson et al. 1999
First occurrence (base): within Pa zone (65.72-66.00Ma, base in Danian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 81

References:

Bang, I. (1969). Planktonic foraminifera and biostratigraphy of the type Danian. In, Brönnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E.J. Brill, Leiden 58-65. gs

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Brönnimann, P. (1953). Note on planktonic foraminifera from Danian localities of Jutland, Denmark. Eclogae Geologicae Helvetiae. 45: 339-341. gs V O

Brotzen, F. & Pozaryska, K. (1961). Foraminiferes du Paleocene et de l'Eocene inferieur en Pologne septentrionale; remarques paleogeographiques. Revue de Micropaléontologie. 4: 155-166. gs

Keller, G. (1993). The Cretaceous-Tertiary Boundary Transition in the Antarctic Ocean and Its Global Implications. Marine Micropaleontology. 21: 1-45. gs

Khalilov, D. M. (1956). 0 pelagicheskoy faune foraminifer Paleogenovykh otlozheniy Azerbaydzhana [Pelagic Foraminifera of the Paleogene Deposits of the Azerbaizhan SSR]. Trudy Instituta Geologii, Akademiya Nauk Azerbaidzhanskoi SSR. 17: 234-255. gs

Liu, C. & Olsson, R. K. (1992). Evolutionary radiation of microperforate planktonic foraminifera following the K/T mass extinction event. Journal of Foraminiferal Research. 22: 328-346. gs

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 173-198. gs V O

Morozova, V. G. (1961). Datsko-Montskie planktonnye foraminifery yuga SSSR [Danian-Montian Planktonic Foraminifera of the Southern USSR]. Paleontologicheskiy Zhurnal. 2(Aug-19): -. gs

Morozova, V. G., Kozhevnikova, G. E. & Kuryleva, A. M. (1967). Datsko-Paleotsenovye Raznofatsial'nye Otlozheniya Kopet-Daga I. Metody Ikh korrelyatsii po foraminiferam [Danian-Paleocene heterofacial deposits of Kopet-Dag and methods of their correlation according to the foraminifers]. Trudy Geologicheskiy Institut Akademiya Nauk SSSR. 157: 1-208. gs

Olsson, R. K. (1970). Paleocene planktonic foraminiferal biostratigraphy and paleozoogeography of New Jersey. Journal of Paleontology. 44(4): 589-604. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs

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


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Globoconusa daubjergensis compiled by the pforams@mikrotax project team viewed: 15-5-2021

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