Catalog entries: Globigerina aspensis, Acarinina pentacamerata acceleratoria, Globigerina colomi
Type images:Distinguishing features: Numerous (6-8; rarely 9-10) chambers in final whorl; large and widely open umbilicus
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.
Wall type: Normal perforate, non-spinose with coarse muricae. [Berggren et al. 2006]
Morphology: Low trochospiral, variable number of subglobular chambers (ranging from 6-8, rarely to 10) in last whorl; intercameral sutures radial, moderately depressed between weakly embracing chambers; umbilicus deep, wide as a result of relatively lax/evolute coiling, no circum-umbilical concentration of muricae; 2-2½ whorls on spiral side; intercameral sutures weakly recurved between early chambers, straight, radial between later chambers; rounded periphery in edge view with no evidence of circumperipheral concentration of muricae; aperture interiomarginal, umbilical-extraumbilical, extending to peripheral margin in last chamber. [Berggren et al. 2006]
Size: Dimensions of holotype unknown; this is, however, a relatively large form that can exceed 0.5 mm in maximum diameter. [Berggren et al. 2006]
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Inequally biconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Inflated | coiling axis: | Low | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Inflated | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Moderately muricate | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 6.0-10.0 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution: Widespread in (sub)tropical regions of the world; not reliably reported (to our knowledge) from austral or boreal regions. [Berggren et al. 2006]
Aze et al. 2011 summary: Low latitudes; based on Berggren et al. (2006b)
Isotope paleobiology: No data available. [Berggren et al. 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study
Phylogenetic relations: Bolli (1957b, p. 167) suggested derivation of aspensis from angulosa. Berggren (1964) and Blow (1979) suggested instead that it evolved from pentacamerata, a view which we uphold here. [Berggren et al. 2006]
Most likely ancestor: Acarinina pentacamerata - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Geological Range:
Notes: Confirmed occurrences only in the lower part of Zone E7. Our studies suggest that aspensis may prove to be a very useful biostratigraphic marker. Some previous authors, since Bolli (1957b, p. 167) have probably confused aspensis with cuneicamerata and hence suggested a much longer stratigraphic range, into the middle Eocene (see also Berggren 1977, p. 259 and Blow, 1979, p. 911). [Berggren et al. 2006]
Last occurrence (top): in mid part of E7a subzone (50% up, 49.3Ma, in Ypresian stage). Data source: Eocene Atlas
First occurrence (base): at base of E7a subzone (0% up, 50.2Ma, in Ypresian stage). Data source: Eocene Atlas
Plot of occurrence data:
Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 264
Berggren, W. A. (1964). The Maestrichtian, Danian and Montian stages and the Cretaceous-Tertiary boundary. Stockholm Contributions in Geology. 11(5): 103-176. gs Berggren, W. A. (1977a). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In, Ramsay, A. T. S. (ed.) Oceanic Micropaleontology. Academic Press, London 205-300. gs Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. 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 9): 257-326. gs V O Bermudez, P. J. (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Editorial Sucre, Caracas. 1119-1393. 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 Bolli, H. M. (1957a). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. 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: 155-172. gs V O Colom, G. (1954). Estudio de las biozonas con foraminiferos del Terciario de Alicante. Boletin del Instituto Geologico y Minero de Espana. 66: 1-279. gs Hillebrandt, A. , von (1976). Los foraminiferos planctonicos, nummulitidos y coccolitoforidos de la zona de Globorotalia palmerae del Cuisiense (Eoceno inferior) en el SE de Espana, (Provincias de Murcia y Alicante. Revista Española de Micropaleontología. 8(3): 323-394. 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 Lu, G. & Keller, G. (1995). Planktic foraminiferal faunal turnovers in the subtropical Pacific during the Late Paleocene to Early Eocene. Journal of Foraminiferal Research. 25: 97-116. gs Poag, C. W. & Commeau, J. A. (1995). Paleocene to middle Miocene planktic foraminifera of the southwestern Salisbury Embayment, Virginia and Maryland: Biostratigraphy, allostratigraphy, and sequence stratigraphy. Journal of Foraminiferal Research. 25: 134-155. gs Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs Samuel, O. & Salaj, J. (1968). Microbiostratigraphy and Foraminifera of the Slovak Carpathian Paleogene. Geologicky Ustav Dionyza Stura, Bratislava. 1-232. gsReferences:
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Acarinina aspensis compiled by the pforams@mikrotax project team viewed: 2-3-2021
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