Chaisson & Leckie (1993):
Remarks: Globoquadrina conglomerata is a large to very large species
with a large, open umbilical aperture surmounted by a triangular tooth on the
final chamber. The test is distinctly cancellate. Seen in edge view, the chambers
can be spherical or slightly laterally compressed. The variation in chamber
shape shows no monotonic stratigraphic trend. There are three and half to four
chambers in the final whorl. Thompson and Sciarrillo (1978) consider G.
conglomerata and G. pseudofoliata to be descendants of G. venezuelana.
Kennett and Srinivasan (1983) think that G. venezuelana and G. baroemoenensis
are unrelated and that the latter species is synonomous with G. conglomerata.
In Hole 806B, a morphological cline exists among all four species. G.
conglomerata and G. pseudofoliata are sufficiently similar morphologically
and mixed stratigraphically to be considered synonymous.
Similar species: Evolution from G. venezuelana involved inflation of the
chambers, a widening of the umbilicus, and broadening of the base of the
umbilical tooth (Parker, 1967; Thompson and Sciarrillo, 1978). Some specimens
retain the tendencies of G. venezuelana toward axially elongate chambers
and an irregular final chamber, but they always have a more open
umbilicus. The ventral sides of chambers of G. conglomerata tend to be more
inflated than those of G. baroemoenensis. |
Schwager,C. (1866):
Fossile Foraminiferen von Kar Nikobar, Reise der Oesterreichischen Fregatte Novara um Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. Von Wuellerstorf-Urbair . Geologischer Theil,Geologische Beobachtung no. 2, Palaeontologische Mittheilung Vol. 2(1) p. 187-268
Banner,F.T. and Blow,W.H. (1960):
Some primary types of species belonging to the superfamily Globigerinaceae . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 11(1) p. 1-41
Parker,F.L. (1962):
Planktonic foraminiferal species in Pacific sediments . Micropaleontology Vol. 8 p. 219-254
Parker,F.L. (1967):
Late Tertiary biostratigraphy (planktonic foraminifers) of tropical Indo-Pacific deep-sea cores . Bull. Am. Paleontol. Vol. 52
Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836
Chaisson,W.P. and Leckie,R.M. (1993):
High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178
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