Acarinina aspensis Colom 1954 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 | . |
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Species Acarinina aspensis Colom 1954 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Normal perforate, non-spinose
with coarse muricae.
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; 2-2 1/2 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.
Size: Dimensions of holotype unknown; this is,
however, a relatively large form that can exceed 0.5 mm
in maximum diameter. |
| Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
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.
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 P1. 9.4, Fig. I) as a lectotype, perpetuating the
taxonomic concept of this form established by Bolli
(1957a, p. 167-168, pl. 37, figs. 18a-c).
PHYLOGENETIC RELATIONSHIPS.-
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.
STRATIGRAPHIC RANGE.-
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 (1 957b, 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. 91 1).
GEOGRAPHIC DISTRIBUTION.-
Widespread in
(sub)tropical regions of the world; not reliably reported
(to our knowledge) from austral or boreal regions.
STABLE ISOTOPE PALEOBIOLOGY.-
No data
available.
REPOSITORY.-
Lectotype (Blow, 1979, p. 909)
reported to be in the personal collection of G. Colom. |
| Systematics: |
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Truncorotaloididae
Genus Acarinina
Species Acarinina aspensis
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| Synonym list: |
Pearson et al. (2006):
1954 Globigerina aspensis Colom. - Colom : p.151 pl. 3, fig. 1-35 (flattened forms);
pl. 4, fig. 1-31 (trochoid forms) (No
holotype designated; lectotype, pl. 3: fig. 16 selected by
Blow, 1979:908); [Upper Ypresian - Lower Lutetian, Aspe,
Alicante, Spain.]
1957 Globorotalia aspensis Colom. - Bolli : p. 167-168 pl. 37; fig. 18a-c [Lower Eocene Globorotalia palmerae
Zone, Navet Fm., Trinidad]
1961 Globigerina aspensis Colom. - Bermudez : p. 1157-1157 pl. 1; fig. 2a-c [Lower Eocene, Universidad Fm., Havana Province,
Cuba]
1961 Globigerina colomi Bermudez. - Bermudez : p.1167 pl. 2; fig. 6a-c [lower Eocene, Universidad Fm., Cuba]
1965 Acarinina aspensis Colom. - Hillebrandt : p.340 pl. 5; fig. 8, 12, 13 [Lower Eocene G. palmerae Zone, Alicante,
Spain]
1979 Turborotalia (Acarinina) aspensis Colom. - Blow : p. 908-911 pl. 148, fig. 7-9;
pl. 153, fig. 5-6;
pl. 157, fig. 1-6;
pl. 165, fig. 5-6;
pl. 203, fig. 6 [Zones P9-P1 0, Kane 9-C piston core, Endeavour
seamount, North Atlantic Ocean]
1995 Acarinina aspensis Colom. - Lu & Keller : pl. 3; fig. 16-18 [lower Eocene, DSDP Site 577, Shatsky Rise,
northwest Pacific Ocean]
1995 Acarinina aspensis Colom. - Poag & Commeau : pl. 2; fig. 28-29 [lower Eocene, Hammond Core, Maryland]
2006 Acarinina aspensis Colom. - Pearson et al. : p.270 pl. 9.4; fig. 1-16 (Pl. 9.4, Fig. 1 : reillustration of lectotype of
Globigerina aspensis Colom)
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| References: |
Colom,G. (1954):
estudios de las biozonas con foraminiferos del Terciario del Alicante . Bol. Esp. Inst. Geol. y Minero Vol. 66 p. 1-279
Khalilov,D.M. (1956):
O pelagicheskoy faune foraminifer Paleogenovykh otlozheniy Azerbaydzhana . Trudy Instituta Geologii, Akademiya Nauk Azerbaydzhanskoy SSR Vol. 17
Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172
Bermudez,P.J. (1961):
Contribucion al estudio de las Globigerinidea de la region Caribe-Antillana (Paleocene-Reciente).
In: Boletino Geologia (Venezuela), Special Publicacion Vol. 3
Hillebrandt,v.A.. (1965):
Los foraminiferos planctonicos, nummulitidos y coccolitoforidos de la zona de Globorotalia palmerae del Cuisiense (Eoceno Inferior) en el SE de Espania, (provincias de Murcia y Alicante) . Revista Espanola de Micropaleontologia Vol. 8 p. 323-394
Samuel,O.. and Salaj,J. (1968):
Microbiostratigraphy and Foraminifera of the Slovak Carpathian Paleogene . Geologicky Ustav Dionyza Stura, Bratislava p. 232
Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp
Lu,G. and Keller,G. (1995):
Planktic Foraminiferal Faunal Turnovers in the Subtropical Pacific during the Late Paleocene to Early Eocene . Journal of Foraminiferal Research Vol. 25 p. 97-116
Poag,C.W.. and 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 Vol. 25 p. 134-155
Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
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