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:
Parent taxon (Acarinina): Moderate to low trochospire; chambers ovoid, usually 4-6 in final whorl.
Wall muricate with pustules on umbilical shoulders;
This taxon: Numerous (6-8; rarely 9-10) chambers in final whorl; large and widely open umbilicus

Description

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]

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]

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

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

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)

No data available. [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.

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 O

Bermudez, P. J. (1961). Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleoceno-Reciente). Editorial Sucre, Caracas. (3): 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

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 O

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:	6-10	N.B. These characters are used for advanced search. N/A - not applicable

Acarinina aspensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments