Acarinina collactea


Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina collactea
Sister taxa: A. medizzai, A. collactea, A. pentacamerata, A. aspensis, A. interposita, A. echinata, A. pseudosubsphaerica, A. alticonica, A. soldadoensis, A. cuneicamerata, A. angulosa, A. africana, A. sibaiyaensis, A. esnehensis, A. mckannai, A. subsphaerica, > >>

Taxonomy

Citation: Acarinina collactea (Finlay 1939)
Rank: Species
Basionym: Globorotalia collactea
Synonyms:
Taxonomic discussion:

Berggren and others (2006) noted that this taxon is a particularly common form in mid-high latitude assemblages, but the extension of the range of Acarinina collactea into the upper Eocene was controversial. Acarinina collactea is the most common Oligocene acarininid. Here we extend the range of this taxon further to the upper Oligocene (Zone O7). Berggren and others (2006) restricted Acarinina collactea to exclusively dextrally coiled specimens (see their plate 9.8). We illustrate specimens with angular chambers and wide sutures that are consistent with Acarinina collactea although they are sinistrally coiled (Plate 13.1, Figs. 11-16). Jenkins (1965a) found 95% of specimens from the type locality to be dextrally coiled. [Wade & Kucenjak 2018]

This is one of the most distinct and ubiquitous components of middle Eocene planktonic foraminiferal assemblages. Distinguished by its small size and compact, densely muricate test with irregularly distributed minute “openings” on the spiral side, it is a familiar and particularly common form in mid-high latitude assemblages.  [Berggren et al. 2006]

This form has been thoroughly studied and documented by Jenkins (1965a) who re-examined Finlay’s original type material. Blow (1979, p. 920) noted that the suturally-located openings on the spiral side do not appear to be functional supplementary apertures and may owe their origin to the “stand off” effect of late stage calcification preventing smooth junction of adjacent chambers owing to the development of previously calcified muricae in the intervening space(s).
The form identified by Bolli (1957a) as Globorotalia spinuloinflata (Bandy) is a subangular variant of the generally more rounded collactea and included here in the synonomy of collactea. In the former Soviet Union collactea has been identified as Acarinina rotundimarginata Subbotina from the middle Eocene of the N. Caucasus. We specifically exclude from collactea the ovate, sinistrally coiled specimens identified by Bronnimann (1952) and Postuma (1971) from the lower Eocene (Zone P6b) of Trinidad. Acarinina collactea is generally subcircular in outline, dextrally coiled and restricted to stratigraphically younger levels. The possible extension of this taxon into upper Eocene levels in high latitudes remains controversial. [Berggren et al. 2006]

Catalog entries: Globorotalia collactea, Acarinina rotundimarginata,

Type images:

Distinguishing features: Small (~0.25-0.30 mm), 5-chambered and compact (involute) test.

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:

Acarinina collactea is characterized by its compact test, subangular chambers that increase slowly in size, and wide, incised sutures. It differs from Acarinina medizzai and A. echinata by its lower trochospire, wedge shaped and more angular chambers. [Wade & Kucenjak 2018]


Wall type: Moderately to coarsely muricate, normal perforate, nonspinose. [Wade & Kucenjak 2018]

Test morphology: Chambers arranged in a low to moderate trochospiral, test compact, typically 4½ -5 chambers in the final whorl, slowly increasing in size; peripheral outline weakly lobate; chambers on the umbilical side wedge-shaped or triangular with blunt and blocky muricae; sutures distinct, straight, radial and wide; umbilicus narrow, deep; umbilical-extraumbilical aperture; weakly convex to flat; on spiral side 10-12 sub-circular chambers in three whorls; sutures weakly incised, curved; rounded to subangular peripheral margin in edge view (modified after Berggren and others, 2006). [Wade & Kucenjak 2018]

Size: Maximum diameter of holotype 0.18 mm, thickness 0.13 mm. [Wade & Kucenjak 2018]

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Cosmopolitan distribution in the Eocene. Our Oligocene records are from the Adriatic Sea and western Indian Ocean. [Wade & Kucenjak 2018]

Isotope paleobiology: No data available. [Wade & Kucenjak 2018]
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): Pearson et al. (1993, 2001a)

Phylogenetic relations: Berggren and others (2006) tentatively suggested that Acarinina collactea evolved from Acarinina pentacamerata. Acarinina collactea probably gave rise to A. medizzai. [Wade & Kucenjak 2018]

Most likely ancestor: Acarinina pentacamerata - at confidence level 2 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Likely descendants: Acarinina medizzai;

Biostratigraphic distribution

Geological Range:
Notes: Zone E7 (Berggren and others, 2006) to Zone O7 (this study), possibly ranges into the Miocene. [Wade & Kucenjak 2018]
Last occurrence (top): within O7 zone (22.96-25.21Ma, top in Aquitanian stage). Data source: Wade & Kucenjak 2018
First occurrence (base): within E7a subzone (48.31-50.20Ma, base in Ypresian stage). Data source: Berggren et al. 2006

Plot of occurrence data:

Primary source for this page: Wade & Kucenjak 2018 - Olig Atlas chap.13 p.395; Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 276

References:

Bandy, O. L. (1949). Eocene and Oligocene foraminifera from Little Stave Creek, Clarke County, Alabama. Bulletin of American Paleontology. 32(131): 1-210. gs

Berggren, W. A. (1960). Some planktonic foraminifera from the Lower Eocene (Ypresian) of Denmark and northwestern Germany. Stockholm University, Contributions to Geology. 5: 41-108. gs

Berggren, W. A. (1969). Paleogene Biostratigraphy and Planktonic Foraminifera of Northwestern Europe. In, Brönnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E. J. Brill, Leiden 121-160. 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. (1992). Paleogene planktonic foraminifer magnetobiostratigraphy of the southern Kerguelen Plateau (sites 747-749). Proceedings of the Ocean Drilling Program, Scientific Results. 551-568. 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: 257-326. 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. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation 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: 61-82. 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

Brönnimann, P. (1952e). Trinidad Paleocene and lower Eocene Globigerinidae. Bulletin of American Paleontology. 34(143): 1-34. gs

Finlay, H. J. (1939b). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand. 69(1): 89-128. gs

Finlay, H. J. (1939c). New Zealand foraminifera: Key species in stratigraphy - no. 3. Transactions of the Royal Society of New Zealand. 69(3): 309-329. gs

Hornibrook, N. d. B. (1961). Tertiary Foraminifera from Oamaru District (N.Z.). Part 1 Systematics and distribution. New Zealand Geological Survey, Paleontological Bulletin. 34(1): 1-192. 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

Jenkins, D. G. & Srinivasan, M. S. (1986). Cenozoic planktonic foraminifera from the equator to the sub-antarctic of the Southwest Pacific. Initial Reports of the Deep Sea Drilling Project. 90: 795-834. gs

Jenkins, D. G. (1965a). A re-examination of Globorotalia collactea Finlay, 1939. New Zealand Journal of Geology and Geophysics. 8: 843-848. gs

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs

Jenkins, D. G. (1985). Southern mid-latitude Paleocene to Holocene planktic foraminifera. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 263-282. gs

Lu, G. & Keller, G. (1993). The Paleocene-Eocene transition in the Antarctic Indian Ocean: Inference from planktic foraminifera. Marine Micropaleontology. 21: 101-142. gs

McKeel, D. R. & Lipps, J. H. (1972). Calcareous plankton from the Tertiary of Oregon. Palaeogeography, Palaeoclimatology, Palaeoecology. 12(01-Feb): 75-93. gs

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

Poore, R. Z. & Brabb, E. E. (1977). Eocene and Oligocene planktonic foraminifera from the Upper Butano sandstone and type San Lorenzo formation, Santa Cruz Mountains, California. Journal of Foraminiferal Research. 7(4): 249-272. gs

Poore, R. Z. & Bybell, L. M. (1988). Eocene to Miocene biostratigraphy of New Jersey Core ACGS #4: Implications for regional stratigraphy. U.S. Geological Survey Bulletin. 1829: 1-41. 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

Wade, B. S. & Hernitz Kucenjak, M. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Acarinina. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46: 393-403. gs


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Acarinina collactea compiled by the pforams@mikrotax project team viewed: 22-7-2019

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