pforams@mikrotax - Globoconusa

Citation: Globoconusa Khalilov, 1956

Type species: Globoconusa conusa Khalilov, 1956 = Globigerina daubjergensis Bronnimann, 1953.

Taxonomic discussion: Globoconusa conusa Khalilov, 1956, is widely considered to be a junior synonym of Globigerina daubjergensis Bronnimann, 1953 (Loeblich and Tappan, 1964, 1988; Khalilov, 1967; Morozova et al., 1967, Olsson, 1970; Premoli Silva, 1977; Hofker, 1978; Smit, 1982; Toumarkine and Luterbacher, 1985; Brinkhuis and Zachariasse, 1988; Stott and Kennett, 1990; D'Hondt and Keller, 1991; Huber, 1991b; Li and Radford, 1991; Liu and Olsson, 1992; Olsson et al., 1992). A different opinion was held by Blow (1979), who noted that Khalilov's (1956:249) type description of Globoconusa conusa differs from the holotype of G. daubjergensis in some respects (i.e., the test of G. conusa was originally described as "strongly thickened" and "covered with small, dense pits"). On this basis, Blow (1979) created the generic designation Globastica for Globigerina daubjergensis and related forms. [Olsson et al. 1999]

Distinguishing features:
Parent taxon (Guembelitriidae): Tests triserial, trochospiral, or nearly triserial in initial whorl becoming biserial. Chambers usually globular or subglobular, increasing gradually in size. Aperture usually a loop-shaped arch, often slightly infolded on one side, marked by a fine lip.
This taxon: 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.

Description

Biogeography and Palaeobiology

Most likely ancestor: Woodringina - at confidence level 3 (out of 5). Data source: Olsson et al. 1999.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of P1c subzone (100% up, 62.6Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Pa zone (65.72-66.00Ma, base in Danian stage). Data source: Total of ranges of species in this database

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 80

References:

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

Brinkhuis, H. & Zachariasse, W. (1988). Dinoflagellate cysts, sea level changes and planktonic foraminifers across the Cretaceous-Tertiary boundary at El Haria, northwest Tunisia. Marine Micropaleontology. 13(2): 153-191. gs

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

D'Hondt, S. & Keller, G. (1991). Some patterns of planktic foraminiferal assemblage turnover at the Cretaceous-Tertiary boundary. Marine Micropaleontology. 17: 77-118. gs

Hofker, J. (1978). Analysis of a large succession of samples through the Upper Maastrichtian and Lower Tertiary of Drill Hole 47.2, Shatsky Rise, Pacific, Deep Sea Drilling Project. Journal of Foraminiferal Research. 8(1): 46-75. 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

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 O

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

Khalilov, D. M. (1967). Mikrofauna i stratigraphfiya Paleogenovykh otlozheniy Azerbaydzhana, Chast' 2 [Microfauna and stratigraphy of the Paleogene deposits of Azerbaydzhan, Part II]. Instituta Geologii im Akademika I.M. Gubkina, Akademiya Nauk Azerbaydzhanskoy SSR, Baku. 1-216. gs

Li, Q. & Radford, S. S. (1991). Evolution and biogeography of Paleogene microperforate planktonic foraminifera. Palaeogeography Palaeoclimatology Palaeoecology. 83: 87-115. 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. (1964b). Sarcodina, Chiefly "Thecamoebians" and Foraminiferida. In, Moore, R. C. (ed.) Treatise on Invertebrate Paleontology, Protista 2, pt. C. University of Kansas Press, Lawrence 1-900. 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 O

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. & Liu, C. (1992). Wall Texture Classification of planktonic foraminifera genera in the Lower Danian. Journal of Foraminiferal Research. 22(3): 195-213. gs

Premoli Silva, I. (1977). Upper Cretaceous-Paleocene magnetic stratigraphy at Gubbio, Italy; II. Biostratigraphy. Geological Society of America, Bulletin. 88: 371-374. gs

Smit, J. (1982). Extinction and Evolution of planktonic foraminifera after a major impact at the Cretaceous/Tertiary boundary. In, Silver, L. T. & Schultz, P. H. (eds) Geological Implications of Impacts of Large Asteroids and Comets on the Earth, Geological Society of America Special Paper 190. 329-352. gs

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

Toumarkine, M. & Luterbacher, H. (1985). Paleocene and Eocene planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge Univ. Press, Cambridge 87-154. gs

Daughter taxa (time control age-window is: 0-800Ma)
			Globoconusa victori Like G. daubjergensis but with a more compact trilobate test with a much larger highly inflated last chamber, and a flattened or somewhat depressed profile.
			Globoconusa daubjergensis 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.
			Globoconusa sp. Specimens which cannot be assigned to established species

Globoconusa

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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