Acarinina aspensis


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Acarinina -> Acarinina aspensis
Sister taxa: A. africana, A. alticonica, A. angulosa, A. aspensis, A. boudreauxi, A. bullbrooki, A. coalingensis, A. collactea, A. cuneicamerata, A. echinata, A. esnaensis, A. esnehensis, A. interposita, A. mcgowrani, A. mckannai, A. medizzai, A. nitida, A. pentacamerata, > >>

Taxonomy

Citation: Acarinina aspensis (Colom 1954)
Rank: Species
Basionym: Globigerina aspensis
Synonyms:
Taxonomic discussion: In comparison to Acarinina pentacamerata, A. aspensis is characterized by an increase in the number of chambers in the final whorl, a more evolute spire and concomitant increase in the width of the umbilicus. This form was originally described from the lower Eocene of Spain, at which time a large number of specimens were illustrated but no holotype designated. Blow (1979, p. 909) designated the specimen illustrated by Colom (1954, pl. 3: fig. 16, reillustrated on Pl. 9.4, Fig. 1) as a lectotype, perpetuating the taxonomic concept of this form established by Bolli (1957a, p. 167-168, pl. 37, figs. 18a-c). [Berggren et al. 2006]

Catalog entries: Acarinina pentacamerata acceleratoria;
Globigerina aspensis;
Globigerina colomi;

Type images:

Short diagnosis: This taxon is distinguished by its large and widely open umbilicus and high but variable number (6-8; rarely to 10) of chambers in the last whorl.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: This taxon is distinguished by its large and widely open umbilicus and high but variable number (6-8; rarely to 10) of chambers in the last whorl. [Berggren et al. 2006]

Wall type: Normal perforate, non-spinose with coarse muricae. [Berggren et al. 2006]

Test 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:Subcircularcoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:Inequally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Moderately muricateaperture:Umb.-extraumbilicalaperture border:N/Aaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Broadly rounded
umb depth:Deepdiameter mm:width mm:breadth mm:
final-whorl chambers:6.0-10.0

Biogeography and Palaeobiology


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]

Biostratigraphic distribution

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): within E7 zone (45.72-50.20Ma, top in Lutetian stage). Data source: Eocene Atlas
First occurrence (base): within E7 zone (45.72-50.20Ma, base in Ypresian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 9, p. 264

References:

Berggren, W.A., (1964). The Maestrichtian, Danian and Montian stages and the Cretaceous-Tertiary boundary. Stockholm Contributions in Geology, 11(5): 103-176.

Berggren, W.A., (1977). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In: Ramsay, A.T.S. (Editor), Oceanic Micropaleontology. Academic Press, London, pp. 205-300.

Berggren, W.A.; Pearson, P.N.; Huber, B.T. & Wade, B.S., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 257-326.

Bermudez, P.J., (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Mem. III Congreso Geol. Venez. Editorial Sucre, Caracas, 1119-1393 pp.

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, 1413 pp.

Bolli, H.M., (1957). Planktonic foraminifera from the Eocene Navet and San Fernando formations of Trinidad. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 155-172.

Colom, G., (1954). Estudio de las biozonas con foramin¡feros del Terciario de Alicante. Boletin del Instituto Geologico y Minero de Espana, 66: 1-279.

Hillebrandt, A., von, (1965). Los foraminiferos planctonicos, nummulitidos y coccolitoforidos de la zona de Globorotalia palmerae del Cuisiense (Eoceno Inferior) en el SE de España, (provincias de Murcia y Alicante). Revista Española de Micropaleontología, 8: 323-394.

Khalilov, D.M., (1956). Pelagic foraminifera of the Paleogene deposits of the Azerbaidzhan SSR. Acad. Nauk SSSR Geol., Inst. Trudy, 17(234-261).

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.

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.

Samuel, O. & Salaj, J., (1968). Microbiostratigraphy and Foraminifera of the Slovak Carpathian Paleogene. Geologicky Ustav Dionyza Stura, Bratislava: 1-232.


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Acarinina aspensis compiled by the pforams@mikrotax project team viewed: 27-7-2017

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