pforams@mikrotax - Acarinina aspensis

Citation: Acarinina aspensis (Colom 1954)

Synonyms:

Globigerina aspensis Colom, 1954:151, pl. 3: figs. 1-35 (flattened forms); pl. 4: figs. 1-31 (trochoid forms) (No holotype designated; lectotype, pl. 3: fig. 16 selected by Blow, 1979:908) [Upper Ypresian - Lower Lutetian, Aspe, Alicante, Spain.].— Bermúdez, 1961:1157-1158, pl. 1: fig. 2a-c [Lower Eocene, Universidad Fm., Havana Province, Cuba].
Globorotalia aspensis (Colom).—Bolli, 1957b:167-168, pl. 37: figs. 18a-c [Lower Eocene Globorotalia palmerae Zone, Navet Fm., Trinidad].
Acarinina aspensis (Colom).—Hillebrandt, 1976:340, pl. 5: figs. 8, 12, 13 [Lower Eocene G. palmerae Zone, Alicante, Spain].—Lu and Keller, 1995, pl. 3: figs. 16-18 [lower Eocene, DSDP Site 577, Shatsky Rise, northwest Pacific Ocean].— Poag and Commeau, 1995: pl. 2: figs. 28-29 [lower Eocene, Hammond Core, Maryland].
Turborotalia ( ?Acarinina) aspensis (Colom).—Samuel and Salaj, 1968:162, pl: 18, fig. 4 [Eocene, Carpathian Mountains, Slovakia].
Globorotalia (Acarinina) aspensis (Colom).—Blow, 1979:908-911, pl. 148: figs. 7-9; pl. 153: figs. 5-6; pl. 157: figs. 1-6; pl. 165: figs. 5-6; pl. 203: fig. 6 [Zones P9-P10, Kane 9-C piston core, Endeavour seamount, North Atlantic Ocean].
Acarinina pentacamerata Subbotina acceleratoria Khalilov, 1956:253, pl. 5: figs. 7a-c [lower Eocene, north-eastern Azerbaidjan].
Globigerina colomi Bermúdez, 1961:1167, pl. 2: fig 6a-c [lower Eocene, Universidad Fm., Cuba].

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]

Distinguishing features: Numerous (6-8; rarely 9-10) chambers in final whorl; large and widely open umbilicus

Description

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]

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]

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

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): 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

Primary source for this page: Berggren et al. 2006 - Eocene Atlas, chap. 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. 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. gs

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

Acarinina aspensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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