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Species Sphaeroidinellopsis multiloba LeRoy 1944


Discussion / Comments:
Bolli & Saunders (1985):
This species, described from the Late Miocene of Java, was originally characterized as possessing 3 to 4 greatly inflated chambers in the last whorl, distinct Sutures, strongly depresed, coarsely perforate glassy wall, large irregular aperture with crenulated edge. This description suggests evolution from S. disjuncta by the formation of a cortex. In the Caribbean/Gulf of Mexico/Atlantic province it begins at about the level of the Globorotalia lobata Zone. As in S. disjuncta, forms with a smaller, radially extended, occasionally sacculiferid endchamber are often present, particularly in the 4 chambered specimens. Due to the formation of a glassy cortex with smooth surface, the walls of the last formed chambers become translucent in well preserved specimens with the pore channels penetrating the walls visible as thin white lines. Examples for this are Figs. 38.12-13 (S. seminulina) and Fig. 38.14 (S. multiloba). Specimens with 5 and, more seldom, 6 chambers in the last whorl be& to occur from about the Globorotalia fohsi J ohn Zone upwards, usually the early forms without a cortex, the later forms with one. Because of their later appearance compared with the 3- and 4-chambered forms they are of some stratigraphic significance.
Synonym list:
Bolli & Saunders (1985):
1944 Sphaeroidinella multiloba Le Roy. - Le Roy : p.91 pl.4, figs.7-9
1959 Sphaeroidinella dehiscens subdehiscens Blow. - Blow : p.195 pl.12, figs.71a-c
1985 Sphaeroidinellopsis multiloba LeRoy. - Bolli & Saunders : p.341 figs. 38.14-17; 7,9,12
References:

Le Roy,L.W. (1944):
Miocene foraminifera from Sumatra and Java, Netherlands East Indies . Quaterly of the Colorado School of Mines Vol. 39

Blow,W.H. (1959):
Age, correlation and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozón Formations, eastern Falcon, Venezuela . Bull. Am. Paleontol. Vol. 39(178) p. 67-252

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262
Anonymous: Unedited TaxonConcept data
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