Orbulinoides beckmanni Saito 1962 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 Orbulinoides beckmanni Saito 1962 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Spinose, cancellate.
Test morphology: Test almost spherical, early
chambers in low trochospiral , then streptospirally coiled
and increasingly larger with a very large, hemispherical
last chamber enveloping the previous whorls and
covering the umbilical area formed by the previous
chambers. Sutures radial, slightly depressed in the early
coil, depressed in the adult stage. Primary aperture
umbilical - extraumbilical in the early stage, in later
stage single primary aperture replaced by smaller
multiple, irregularly arched, sutural apertures developed at the base of the last chambers; numerous spiral
supplementary apertures in the early coils; the last one
or two chambers may possess areal apertures. Small
bullae or some irregular bulla-like structures may also
be present.
Size: Dimensions: 0.50-0.60 mm. |
| Discussion / Comments: |
Toumarkine & Luterbacher (1985):
The genus Orbulinoides is monotypic. Orbulinoides diners from Globigerinatheka in possessing spiral areal apertures in the large globular end-chamber which connect via vestibules with apertures of the covering thick wall. Orbulinoides possesses a larger number of sutural apertures in the last two or three chambers and it may have areal apertures in the last chambers which are not known in Globigerinatheka,
0. beckmanni has a similarly large test (0.4 to 0.7 mm) as the large species of Globigerinatheka (G. subconglobata euganea and G. subconglobata luterbacheri) but it can be differentiated from them by the almost spherical shape of the test and the final chamber which strongly embraces the umbilical region and the multiple sutural openings.
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
Orbulinoides
beckmanni is distinctive due to its spherical test with
numerous small secondary apertures. It differs from its
ancestor Globigerinatheka euganea as well as from the
other globigerinathekids by possessing a well-developed
inner spire and a greater number of sutural
supplementary apertures along the inner spire.
DISCUSSION.-
The holotype chosen by Saito (19621, here refigured in P1. 7.10, Figs. 1-3, falls within the variability of 0 . beckmanni as the last chamber possesses numerous supplementary apertures at its base; however' the enveloping degree of the early chambers of the outer whorl by the last chamber is moderate, resulting in a less compact shape instead of a spherical shape as in specimens illustrated in P1.7.11, Figs. 4- 16; in addition, the sutural supplementary apertures are poorly visible in the early chambers. While the presence of areal supplementary apertures is further confirmed (see Pl. 7.11, Fig. 15), we do not have any evidence that the sutural supplementary apertures open into vestibules as described by Cordey (1968) and Proto Decima and Bolli (1970). The specimens illustrated by Blow (1979) as
Globigerapsis beckmanni in pl. 192, figs. 6-9 do not
represent the beckmanni stage, because they lack
multiple sutural supplementary apertures even at the base
of the last chamber (see Blow, 1979, p. l 138) and in our
opinion they fall within the variability of G. euganea.
PHYLOGENETIC RELATIONSHIPS.-
Proto Decima
and Bolli (1 970) indicated that Orbulinoides beckmanni
is the end member of the lineage curryi-euganea-beckmanni.
STRATIGRAPHIC RANGE.-
Orbulinoides
beckmanni has a restricted stratigraphic range, confined
to the middle Eocene Zone E12 (P13) (Orbulinoides
beckrnanni Zone).
GEOGRAPHlC DISTRIBUTION.-
Tropical to warm
mid latitudes.
STABLE ISOTOPE PALEOBIOL0GY.-
No data
available. |
| Systematics: |
15
Classis Foraminifera
Genus Orbulinoides
Species Orbulinoides beckmanni
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Globigerinidae
Genus Orbulinoides
Species Orbulinoides beckmanni
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| Synonym list: |
Toumarkine & Luterbacher (1985):
Pearson et al. (2006):
p 1953 Globigerinoides mexicana Cushman. - Beckmann : p.393 pl. 25 (partim); fig. 17-19 (not figs. 1 5, 16 =
G. euganea); [middle Eocene, Oceanic Fm., Barbados];
[Not Cushman, 1925]
1957 Porticulasphaera mexicana Cushman. - Bolli et al. : p. 34-35 pl. 6; fig. 8-9b [middle Eocene
Orbulinoides beckmanni Zone, Navet Fm. Trinidad]
1957 Porticulasphaera mexicana Cushman. - Bolli : p.165 pl. 37; fig. 1a-b [middle Eocene,
Orbulinoides beckmanni Zone, Navet Fm., Trinidad]; [Not
Cushman, 1925]
1968 Orbulinoides beckmanni Saito. - Cordey : p. 371-375 text-fig. 1a-d [Eocene Orbulinoides beckmanni Zone,
Navet Fm., Point-a-Pierre, Trinidad]
1970 Orbulinoides beckmanni Saito. - Proto Decima & Bolli : p.899 text-fig. 16-30, 32-37;
pl. 1, fig. 12;
pl. 2, fig. 8, 11 [middle Eocene Orbulinoides beckmanni
Zone, (text-figs. 32-34, 36, S 205), Mount Hillaby River
Section, Barbados]
1970 Orbulinoides beckmanni Saito. - Mohan & Soodan : pl. 2; fig. 11a-b [middle Eocene Orbulinoides beckmanni Zone,
Kutch, India]
1970 Orbulinoides beckmanni Saito. - Samanta : pl. 2; fig. 22-23 [middle
Eocene Orbulinoides beckmanni Zone, Lakhpat, Cutch,
India]
? 1970 Orbulinoides beckmanni Saito. - Baumann : pl. 3; fig. 2 [middle Eocene Orbulinoides beckmanni Zone,
Bottaccione Section, Gubbio, central Italy]
1975 Orbulinoides beckmanni Saito. - Stainforth et al. : fig. 38.1a-b (from Bolli, 1957);
fig. 38.4, 5, 8 (from Proto Decima and Bolli, 1970);
figs. 38.2, 3-7, 9 [middle Eocene Orbulinoides beckmanni
Zone, Oceanic Fm., Barbados]
1975 Orbulinoides beckmanni Saito. - Toumarkine : pl. 4; fig. 15, 16 [middle Eocene Orbulinoides beckmanni
Zone, DSDP Site 3 13, Mid Pacific Mountains, Pacific]
1978 Orbulinoides beckmanni Saito. - Toumarkine : pl. 3; fig. 9-13 [middle Eocene
Orbulinoides heckmanni Zone, DSDP Site 363, South
Atlantic Ocean]
non 1979 Globigerapsis beckmanni Saito. - Blow : p. 1137-1138 pl. 192; fig. 6-9, ?fig. 5 [middle Eocene Zone P13,
Kilwa area, Tanzania]; (= G. euganea)
1983 Orbulinoides beckmanni Saito. - Toumarkine : pl. 21; fig. 1a-b (from Bolli and others, 1957), fig. 2a-b (from Bolli, 1957), fig. 3-4 (from Proto Decima and Bolli, 1970), figs. 5-6 (from Toumarkine, 1975)
2003 Orbulinoides beckmanni Saito. - Warraich & Nishi : pl. 2; fig. 9a-b [middle Eocene
Zone P1 3, Zinda Pir West Section, Kirthar Fm., Sulaiman
Range, Indus Basin, Pakistan]
2006 Orbulinoides beckmanni Saito. - Pearson et al. : p.203 pl. 7.11; fig. 1-16 (Pl. 7.1 1, Figs. 1-3: reillustration and new SEMs of
holotype of Porticulasphaera beckmanni Saito)
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| Specimen: |
Collection of the Tohoku University, Sendai, Japan , Inventory number: 79016
Collection of the Tohoku University, Sendai, Japan , Inventory number: 79017
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM P3902
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM P5728
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| References: |
Beckmann,J.P. (1953):
Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados. KI. Antillen . Eclogae Geologicae Helvetiae Vol. 46 p. 301-412
Bolli,H.M.; Loeblich,A.R. and Tappan,H. (1957):
The Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae, and Globotruncanidae . U.S. National Museum Bull. Vol. 215 p. 3-50
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
Saito,T. (1962):
Eocene planktonic foraminifera from Hahajima (Hillsborough Island) . Trans. Proc. Paleontol. Soc. Japan, news series Vol. 45 p. 209-225
Cordey,W.G.. (1968):
A new Eocene Cassigerinella from Florida . Paleontology Vol. 11(3) p. 368-370
Baumann,P.. (1970):
Mikropalaentologische und stratigraphische Untersuchungen der obereozaenen-oligozaenen Scaglia im zentralen Apennin (Italien) . Eclogae Geologicae Helvetiae Vol. 63 p. 1133-1211
Samanta,B.K. (1970):
Middle Eocene Planktonic Foraminifera from Lakhpat, Cutch, Western India . Micropaleontology Vol. 16
Mohan,M.. and Soodan,K.S.. (1970):
Middle Eocene planktonic foraminiferal zonation of Kutch, India . Micropaleontology Vol. 16 p. 37-46
Proto Decima,F. and Bolli,H.M. (1970):
Evolution and variability of Orbulinoides beckmanni (Saito) . Ecoglae geologicae Helvetiae Vol. 63 p. 883-905
Postuma,J.A. (1971):
Manual of Planktonic Foraminifera. p. 422 pp
Toumarkine,M. (1975):
Middle and Late Eocene planktonic foraminifera from the northwestern Pacific, Leg 32 of the Deep Sea Drilling Project.
In: Initial Reports of the Deep Sea Drilling Project Vol. 32 Eds: Larson, R.L.Moberly, R. p. 735-751
Stainforth,R.M.; Lamb,J.L.; Luterbacher,H.P.; Beard,J.H. and Jeffords,R.M. (1975):
Cenozoic planktonic foraminiferal zonation and characteristics of index forms . Paleontological ContributionsArticle 62 p. 425
Toumarkine,M. (1978):
Planktonic Foraminiferal Biostratigraphy of the Paleogene of Sites 360 to 364 and the Neogene of Sites 362A, 363, and 364 Leg 40.
In: Initial Results of the Deep Sea Drilling Project Vol. 40
Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp
Salaj,J. (1980):
Microbiostratigrayhie du Crétacé et du Paléogéne de la Tunisie septentrionale et orientale (hypostratotypes tunisiens) . Geologický Ústav Dionýza Stúra, Bratislava p. 238
Toumarkine,M. (1983):
Les Foraminiféres planctoniques de l'Eocène moyen et supérieur des régions tropicales a temperées chaudes. , Thése de Doctorat d'Etat ès Sciences Vol. 6(83-05) p. 219
Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154
Warraich,M.Y.. and Nishi,H.. (2003):
Eocene planktic foraminiferal biostratigraphy of the Sulaiman range, Indus Basin, Pakistan . Journal of Foraminiferal Research Vol. 33 p. 219-236
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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