Acarinina coalingensis


Classification: pf_cenozoic -> Truncorotaloididae -> Acarinina -> Acarinina coalingensis
Sister taxa: << < A. esnehensis, A. mckannai, A. subsphaerica, A. bullbrooki, A. punctocarinata, A. boudreauxi, A. rohri, A. topilensis, A. praetopilensis, A. mcgowrani, A. quetra, A. pseudotopilensis, A. wilcoxensis, A. esnaensis, A. primitiva, A. coalingensis, A. nitida, A. strabocella, A. sp.,

Taxonomy

Citation: Acarinina coalingensis (Cushman and Hanna 1927)
Rank: Species
Basionym: Globigerina coalingensis
Synonyms:
Taxonomic discussion: Berggren and Norris (1997) and Olsson and others (1999) discussed the gradual evolution of the coalingensis -primitiva lineage and included primitiva in synonymy with coalingensis. Having studied populations of A. primitiva in the type Hampden Beach Formation, New Zealand, we now conclude that they are not synonymous; see also under A. primitiva. We
restrict the concept of coalingensis to the robust, triangular-subquadrate tests with (predominantly) globular chambers (typified by Globigerina coalingensis Cushman and Hanna) and its junior synonym Acarinina triplex Subbotina. [Eocene Atlas]

Catalog entries: Globigerina coalingensis, Globoquadrina primitiva, Acarinina triplex

Type images:

Distinguishing features: Test robust, compact, 3-4 chambers in final whorl; strongly and bluntly muricate; peripheral margin broadly rounded in edge view; chambers are arranged at right angles to each other are usually separated by deep, incised sutures on umbilical side, and increase rapidly in size.

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: Robust test, 3-4 chambered final whorl, compact, subquadrate (primitiva morphotype) to subtriangular (coalingensis morphotype), strongly and bluntly muricate test; peripheral margin broadly rounded, less commonly subangular in edge view; chambers are arranged at distinct right angles to each other and usually separated by deep, incised sutures (particularly between preantepenultimate and antepenultimate chambers) on umbilical side, and increase rapidly in size; aperture interiomarginal, umbilical-extraumbilical. [Olsson et al. 1999]

Test morphology: There are two basic morphotypes that characterize this robust and strongly muricate species: a form with a triangular-subquadrate appearance characterized by (predominantly) globular chambers (typified by Globigerina coalingensis Cushman and Hanna, 1927, and its junior synonym Acarinina triplex Subbotina, 1953), and a form with a subquadrate to quadrate appearance characterized by straight and circumumbilically pointed, smooth (nonmuricate) globoquadrinid-like chambers (typified by Globoquadrina primitiva Finlay, 1947). These two morphotypes have been synonymized by some workers (Berggren, 1977) and distinguished by others (Pearson et al., 1993; Pearson, 1993). After having considered these forms synonymous, Berggren (1977) distinguished them at Kerguelen Plateau sites based on the perception of their morphologic differences and different stratigraphic ranges (Berggren, 1992). Our work described herein suggests that the earlier interpretation may be more correct. One of us (WAB) has examined topotypic material of A. coalingensis (including the reillustrated holotype, Berggren, 1977, pl. 10), A. primitiva, and the holotype and topotypes of A. triplex and now believes that these forms belong to a single taxon that exibits a gradual replacement through time of the coalingensis morphotype by the primitiva morphotype. Inasmuch as consistent distinction between these two morphotypes appears impossible, we believe it more appropriate to use a single name for this "taxon" and suggest that authors provide careful descriptions to denote the presence/development of one morphotype relative to the other should this prove useful for biostratigraphic purposes.

Character matrix

test outline:Quadratechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Coarsely muricateshell porosity:Finely Perforate: 1-2.5µm
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:
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (1999)

Isotope paleobiology:
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)

Most likely ancestor: Acarinina nitida - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Likely descendants: Acarinina primitiva;

Biostratigraphic distribution

Geological Range:
Notes: Zone P4c-E7; (not to P14, = E13 of this study, as given by Olsson and others, 1999).

[Eocene Atlas]
Last occurrence (top): within E7a subzone (48.31-50.20Ma, top in Ypresian stage). Data source: Olsson et al. 1999
First occurrence (base): within P4c subzone (57.10-57.79Ma, base in Thanetian stage). Data source: Olsson et al. 1999, fig5a

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 47

References:

Berggren, W. A. & Norris, R. D. (1997). Biostratigraphy, phylogeny and systematics of Paleocene trochospiral planktonic foraminifera. Micropaleontology, Supplement 1. 43: 1-116. 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(Chap 9): 257-326. gs :: ::

Cushman, J. A. & Hanna, G. D. (1927). Foraminifera from the Eocene near San Diego, California. Transactions of the San Diego Society of Natural History. 5: 45-64. gs :: ::

Finlay, H. J. (1947). New Zealand foraminifera: Key species in stratigraphy - no. 5. New Zealand Journal of Science and Technology. 28(5): 259-292. 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 :: ::

Pearson, P. N. (1993). A lineage phylogeny for the Paleogene planktonic foraminifera. Micropaleontology. 39: 193-232. gs :: ::

Pearson, P. N., Shackleton, N. J. & Hall, M. A. (1993). Stable isotope paleoecology of middle Eocene planktonic foraminifera and multi-species isotope stratigraphy, DSDP Site 523, South Atlantic. Journal of Foraminiferal Research. 23: 123-140. gs :: ::

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


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Acarinina coalingensis compiled by the pforams@mikrotax project team viewed: 6-6-2020

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