pforams@mikrotax - Eoglobigerina edita

Citation: Eoglobigerina edita (Subbotina 1953)

Synonyms:

Globigerina edita Subbotina, 1953:62, pl. 2: fig. la-c [Zone of rotaliform Globorotalia (Danian Stage), Kuban River section, northern Caucasus].—Fox and Olsson, 1969:1398, pl. 168: figs. 1-4 [lower Paleocene, Cannonball Fm., North Dakota]. —Shutskaya, 1970b, pl. 18: fig. 14a-c [middle subzone of Globigerina trivialis -Globoconusa conusa -Globorotalia compressa Zone, Malyi Balkhan Ridge, western Turkmenia] [in part, not pl. 18: fig. 12a-c].
Globigerina edita Subbotina var. polycamera Khalilov, 1956:235, pl. 1: fig. l a - c [Danian Stage, Akhchakuima, northeastern Azerbaizhan]. —Shutskaya, 1970a:119, pl. 18: fig. lla-c [middle subzone of Globogerina trivialis Globoconusa daubjergensis -Globorotalia compressa Zone, Khazin-Don River section, northern Caucasus].
Globigerina (Eoglobigerina) hemisphaerica Morozova, 1961:11, pl. 1: fig. 4 [Zone Dnl II, lower substage of Danian Stage, Tarkhankut Peninsula, Crimea].
Globigerina (Eoglobigerina )pentagona Morozova, 1961:13, pl. 1:fig.3 [Zone Dnl I, lower substage of Danian Stage, Tarkhankut Peninsula, Crimea].
Globigerina (Eoglobigerina) tetragona Morozova, 1961:13, pl. 1: fig. 2 [Zone Dnl I, lower substage of Danian Stage, pre-Caspian Basin, Novouzensk].
Globigerina (Eoglobigerina) theodosica Morozova, 1961:11, pl. 1:fig.6 [Zone Dnl I, lower substage of Danian Stage, Tarkhankut Peninsula, Crimea]. Globorotalia (Globorotalia) edita (Subbotina).—Hillebrandt, 1962:130, pl. 11:figs. 14, 15 [Zone A, lower Paleocene, Reichenhall-Salzburg Basin, Austro-German border].
Eoglobigerina edita edita (Subbotina).—Blow, 1979:1210, pl. 61: figs. 2, 3, pl. 66: fig. 1 [Zone Pa, DSDP Hole 47.2/11/3: 148-150 cm], pl. 69: fig. 6 [Zone PI, DSDP Hole 47.2/11/3: 0-5 cm], pl. 72: figs. 6, 8 [Zone PI, DSDP Hole 47.2/11 /3: fig. 6, 148-150 c m; fig. 8, top section; Shatsky Rise, northwestern Pacific Ocean], pl. 79: fig. 3 [Zone P2, DSDP Hole 20C/6/4: 72-74 cm; Brazil Basin, South Atlantic Ocean].
Eoglobigerina edita (Subbotina).—Hemleben, Muhlen, Olsson, and Berggren, 1991:126, pl. 7: fig. 4-6 [Zone Pa, Clayton Basal Sands, Millers Ferry, Alabama].—Berggren, 1992:562, pl. 1: figs. 5, 6 [Zone Plb, ODP Hole 747A/19H/CC; Kerguelen Plateau, southern Indian Ocean],—Olsson, Hemleben, Berggren, and Liu, 1992:197, pl. 2: figs. 1-5, 7 [figs. 1-4, Zone Pa, Clayton Basal Sands; figs. 5, 7, Zone Pla, Pine Barren Mbr., Clayton Fm., Alabama].
Eoglobigerina edita polycamera Khalilov.—Olsson, Hemleben, Berggren, and Liu, 1992:197, pl. 2: fig. 6 [Zone Pla, Pine Barren Mbr., Clayton Fm., Millers Ferry, Alabama]. [Olsson et al. 1999]

Taxonomic discussion: A considerable variation in the height of the initial coil and the position of the aperture from an umbilical toward an extraumbilical position occurs in this species. Blow (1979) discussed the high degree of variability among early eoglobigerinids and the apparent fact that few morphotypes exhibit a consistent expression of morphologic characters. Thus, he cautioned that strict morphologic limits cannot be as rigidly applied to early eoglobigerinids as to the later, more stable morphospecies of globigerinacean genera. Blow also distinguished as a subspecies of edita the morphospecies
praeedita, which can be viewed as intermediate between eobulloides and edita. Eoglobigerina edita is an intermediate member of the eobulloides-edita -spiralis lineage, which terminated in Zone P2 (see also Pearson, 1993).
Examinations of the holotypes (Plate 8: Figures 13-18, Plate 9: Figures 1-6) of Eoglobigerina hemisphaerica Morozova, E. theodosica Morozova, E. tetragona Morozova, and E. pentagona Morozova suggest that these are junior synonyms of edita Subbotina. These Morozova species are all characterized by having a weakly cancellate test and an elevated initial whorl, which places them within the edita plexus. The difference between these morphotypes is the elevation of the spire (high in hemisphaerica and pentagona, lower in theodosica and tetragona) and the number of chambers in the ultimate whorl (5½ in hemisphaerica, 5 in theodosica, Axli in pentagona, 4 in tetragona). The 5½-chambered, finely cancellate holotype of hemisphaerica has a distinctly elevated spiral side; Morozova (1961) drew attention to the "stepped nature" of the antepenultimate and penultimate whorls, which was said to serve to distinguish hemisphaerica from edita. We regard this as being within the range of variation of E. edita. [Olsson et al. 1999]

Distinguishing features:
Parent taxon (Eoglobigerina): Low, trochospiral test, 4-6½ globular chambers in final whorl; umbilicus small and open to the apertures of surrounding chambers. Wall cancellate and spinose wall with spine holes along the ridges.
This taxon: Test small (<250µm) moderately elevated trochospire, 4½ to 5 (rarely up to 7) globular chambers in final whorl, increasing gradually in size; strongly lobulate peripheral margin. Aperture rounded, umbilical to slightly extraumbilical, with a narrow lip. Umbilicus small but open to the previous chambers. Weakly developed cancellate wall texture with numerous spine holes along the ridges.

Description

The species is characterized by a moderately high trochospiral test with 4½ to 5 (occasionally up to 7) globular chambers which increase gradually in size in the ultimate whorl, and a strongly lobulate peripheral margin. The aperture is a rounded umbilical to slightly extraumbilical aperture which is bordered by a narrow lip. The umbilicus is small but open to the previous chambers. The cancellate wall is weakly developed and spinose with numerous spine holes along the cancellate ridges. The overall size of the test is generally <250 µm. [Olsson et al. 1999]

Biogeography and Palaeobiology

Worldwide in high and low
latitudes (Figure 7). [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (1999)

No data. [Olsson et al. 1999]
Aze et al. 2011 ecogroup 3 - Open ocean thermocline; based on comparison with other species of the genus.

This species evolved from Eoglobigerina eobulloides near the base of Zone Pa by an increase in the number of chambers in the last whorl and a slowing of the rate of growth of these chambers. In addition, there is a trend towards an elevated initial spire. An increase in the degree of spinosity is also evident in the evolution of E. edita. [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Zone Pa to Zone Pic; ? P2. [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): in lower part of Pa zone (30% up, 65.9Ma, in Danian stage). Data source: Olsson et al. 1999

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 19

References:

Berggren, W. A. (1992). Paleogene planktonic foraminifer magnetobiostratigraphy of the southern Kerguelen Plateau (sites 747-749). Proceedings of the Ocean Drilling Program, Scientific Results. 120: 551-568. 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

Fox, S. K. & Olsson, R. K. (1969). Danian Planktonic Foraminifera from the Cannonball Formation, North Dakota. Journal of Paleontology. 43: 1397-1404. gs

Hemleben, C., Mohlen, D., Olsson, R. K. & Berggren, W. A. (1991). Surface texture and the first occurrence of spines in planktonic foraminfera from the early Tertiary. Geologisch Jarhbuch. 128: 117-146. gs

Hillebrandt, A. , von (1962). Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg. Abhandlungen Bayerischen Akademie der Wissenschaften. 108: 1-182. 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

Morozova, V. G. (1961). Datsko-Montskie planktonnye foraminifery yuga SSSR [Danian-Montian Planktonic Foraminifera of the Southern USSR]. Paleontologicheskiy Zhurnal. (2): 8-19. gs O

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

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

Shutskaya, E. K. (1970a). Morphologic groups and descriptions of species of Globigerina and Acarinina in the lower Paleogene of the Crimea, the Caucasus Foreland, and western Central Asia. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 69: 79-113. gs

Shutskaya, E. K. (1970b). Stratigrafiya, foraminifery i paleogeografiya nizhnego paleogena Kryma, predkavkaz'ya i zapadnoi chadsti srednei azii [Stratigraphy, Foraminifera and Paleogeography of the Lower Paleogene in the Crimea, Precaucasus and the Western Part of Central Asia]. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 70(1): 256-. gs

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Spiroconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Inflated	coiling axis:	High	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4.5-5	N.B. These characters are used for advanced search. N/A - not applicable

Eoglobigerina edita

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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