Globorotaliacrassaformis Galloway and Wissler.— Subbotina, 1953:223 (partim), pl. 21: figs. 5a-c [lower part of Zone of acarininids, Foraminiferal Beds, Green Group, Kuban River, North Caucasus]. [Not Galloway and Wissler, 1927.]
Acarininapunctocarinata Fleisher, 1974:1014, pl. 3: figs. 4-6 (holotype), 7, 8 [Zone P11, DSDP Site 220, Arabian Sea].
Taxonomic discussion: Lower middle Eocene strata are characterized by a robust acarininid with distinctly wedge-shaped chambers and a peripheral concentration of thick, blunt muricae. Fleisher (1974) denominated this morphotype Acarininapunctocarinata. [Berggren et al. 2006]
Distinguishing features: Parent taxon (Acarinina): Moderate to low trochospire; chambers ovoid, usually 4-6 in final whorl. Wall muricate with pustules on umbilical shoulders; This taxon: Like A. boudreauxi but larger and with distinct punctate pseudocarina formed by peripheral concentration of blunt, thick muricae.
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: This taxon is distinguished from bullbrooki in the tangential elongation of its chambers (giving the test a semi- rectangular vs. (sub)quadrate shape), development of wedge-shaped chambers on the umbilical side, generally more angulo-conical umbilical profile and distinct punctate pseudocarina formed by peripheral concentration of blunt, thick muricae. [Berggren et al. 2006] Morphology: Low-trochospiral, 4 inflated, wedge-shaped chambers in last whorl, distinctly longer axially than radially broad; umbilicus open, deep, and generally relatively wide; aperture a low arch bordered by distinct lip extending towards, but not reaching, the peripheral margin; short, blunt muricae concentrated on umbilical shoulders but no circumumbilical muricate rim; sutures radial to slightly curved, distinctly incised; spiral side with radial to slightly curved sutures; distinctly punctate pseudocarina formed by peripheral concentration of muricae; in edge view periphery is subacute with distinctly punctate pseudocarina. [Berggren et al. 2006] Wall type: Strongly muricate, normal perforate, nonspinose. [Berggren et al. 2006] Size: Maximum diameter of holotype 0.33mm, thickness 0.24 mm. [Berggren et al. 2006]
Character matrix
test outline:
Subquadrate
chamber arrangement:
Trochospiral
edge view:
Planoconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Crescentic
coiling axis:
Low
periphery:
N/A
aperture border:
Thin lip
umb chbr shape:
Subtriangular
umbilicus:
Wide
periph margin shape:
Subangular
accessory apertures:
None
spiral sutures:
Moderately depressed
umb depth:
Deep
wall texture:
Coarsely muricate
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Moderately depressed
final-whorl chambers:
4-5
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Geographic distributionCosmopolitan distribution (from tropical to austral regions). [Berggren et al. 2006]
Aze et al. 2011 summary: Cosmopolitan; based on Berggren et al. (2006b) Isotope paleobiology[Berggren et al. 2006] Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts; based on comparison with other species of the genus. Phylogenetic relationsEvolved from A. boudreauxi (see also Blow, 1979, p. 936-937). [Berggren et al. 2006]
Most likely ancestor: Acarinina boudreauxi - at confidence level 4 (out of 5). Data source: Berggren et al. (2006) fig9.2.
Biostratigraphic distribution
Geological Range: Notes: Zone E7 (upper part) to Zone E11 [Berggren et al. 2006] Last occurrence (top): within E11 zone (40.40-41.89Ma, top in Bartonian stage). Data source: Eocene Atlas First occurrence (base): in upper part of E7a subzone (80% up, 48.7Ma, in Ypresian stage). Data source: Eocene Atlas
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Acarinina
Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 9, p. 308
References:
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. gsO
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
Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gsO
Galloway, J. J. & Wissler, S. G. (1927). Pleistocene foraminifera from the Lomita Quarry, Palos Verdes Hills, California. Journal of Paleontology. 1(1): 35-87. gs
Acarinina punctocarinata compiled by the pforams@mikrotax project teamviewed: 12-3-2026
Eocene_Atlas_pl09-5_fig4-8.jpg
Eocene_Atlas_pl09-5_fig4-8.jpg
holotype: A. punctocarinata
holotype: A. punctocarinata
paratypes: A. punctocarinata
