Morozovelloides bandyi Fleisher 1974 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 | . |
Notice: This catalogue page may contain unedited data.
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Species Morozovelloides bandyi Fleisher 1974 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Muricate, normal perforate with
smooth areas on the spiral side.
Test morphology: Planoconvex to lenticular test,
coiled in a low trochospiral, with concentration of bladed
muricae around the petaloid periphery that constitute a
discontinuous muricocarina. Four to five chambers in
the final whorl, added in such a way that their long axes
are strongly disjunct when viewed on the dorsal side.
Typically the chambers are imbricate, sometimes
strongly so, as if tilted relative to the dorso-ventral plane.
Small supplementary apertures are commonly present
at the base of the sutures between the penultimate and
antepenultimate chambers, and more rarely earlier in the
spire. Primary aperture is a low, flat arch, in an umbilical-extraumbilical
position. Umbilicus moderately broad and
deep. Ventral sutures depressed with umbilical shoulders
of chambers commonly showing concentrations of muricae (but not to the extent seen in M. coronatus, see
below).
Size: Maximum diameter of holotype about 0.28
mm; height 0.16 mm. |
| Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
Distinguished from
all other species of Morozovelloides by the strongly
disjunct long axes of the chambers, as seen in spiral view,
and from Acarinina praetopilensis by having a more
dorso-ventrally flattened test and peripheral (as opposed to
circum-cameral) muricocarina.
DISCUSSION.-
M orozovelloides bandyi is a common
form in Zones E8 and E9, but first appears in the upper
part of Zone E7 where it intergrades with Acarinina
praetopilensis. It has probably been described previously
on many occasions as crassata or spinulosa, but such
synonymies in the older literature are difficult to verify
because M. bandyi is strongly homeomorphic to the
Morozovella aequa-M. subbotinae group of the lower
Eocene.
PHYLOGENETIC RELATIONSHIPS.-
Morozovelloides bandyi evolved from Acarinina praetopilensis
and gave rise to M. crassatus.
STRATIGRAPHIC RANGE.-
First appears in the
upper Part of Zone E72 intergrading with A.
praetopilensis. Most common in Zones E8 and E9, but
ranging as high as Zone E10.
GEOGRAPHIC DISTRIBUTION.-
Cosmopolitan.
STABLE ISOTOPE PALEOBIOL0GY.-
Oxygen and
carbon isotopes indicate a mixed layer, phososymbiotic
habitat (Boersma and others, 1987 [recorded as
Morozovella cf. aequa], Pearson and others, 1993 and
Pearson and others, 2001 [recorded as Morozovella
crassata]). Boron isotope data suggest a deeper habitat
than co-occurring M. crassatus (Pearson and Palmer,
1999, recorded as Morozovella crassata;
Morozovelloides crassatus recorded as Morozovella
spinulosa).
REPOSITORY.-
Deposited in the Cushman Collection
at the Smithsonian Museum of Natural History,
Washington, D.C. |
| Systematics: |
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Truncorotaloididae
Genus Morozovelloides
Species Morozovelloides bandyi
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| Synonym list: |
Pearson et al. (2006):
1930 Globorotalia crassata Cushman. - Cushman & Barksdale : p. 67-68 pl. 12; fig. 7a-b [Eocene, Martinez Fm., California]
1939 Globorotalia crassata Cushman. - Cushman : p.74 pl. 12; fig. 19 ["upper Eocene", submarine core off eastern north America];
[Not
Cushman, 1925]
1953 Globorotalia spinulosa Cushman. - Beckmann : p. 397-398 pl. 26; fig. 13 [middle upper Eocene, Oceanic Fm.,
Barbados]; [Not Cushman, 1927]
1974 Morozovelloides bandyi Fleisher. - Fleisher : p.1034 pl. 14; fig. 3-8 [Middle Zone P10 to Zone P1 1, DSDP Sites 219 and 220,
Arabian Sea]
1993 Morozovella crassata Cushman. - Pearson et al. : pl. 2; fig. 4-6 [middle Eocene Zone P1 1-P1 2,
DSDP Site 523, Walvis Ridge, south Atlantic Ocean];
[Not Cushman, 1925]
2006 Morozovelloides bandyi Fleisher. - Pearson et al. : p.333 pl. 10.1; fig. 1-16 (Pl. 10.1, Figs. 1-3: new SEMs of holotype of
Morozovella bandyi Fleisher)
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| References: |
Cushman,J.A. and Barksdale,J.D.. (1930):
Eocene foraminifera from Martinez, California . Stanford University, Department of Geology, Contributions Vol. 1 p. 55-73
Cushman,J.A. (1939):
Eocene Foraminifera. from submarine cores off the eastern coast of North America . Contr. Cushman Lab. Foram. Res. Vol. 15 p. 49-76
Beckmann,J.P. (1953):
Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados. KI. Antillen . Eclogae Geologicae Helvetiae Vol. 46 p. 301-412
Fleisher,R.L. (1974):
Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A.
In: Initial Reports of the Deep Sea Drilling Project Vol. 23 Eds: Whitmarsh, R.B.Weser, O.E.Ross, D.A. p. 1001-1072
Pearson,P.N.; Shackleton,N.J. and Hall,M.A. (1993):
The Stable Isotope Paleoecology of Middle Eocene Planktonic Foraminifera and Multi-species integrated Isotope Stratigraphy . Journal of Foraminiferal Research Vol. 23 p. 123-140
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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