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Species Globoquadrina baroemoenensis Le Roy 1939


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test medium, low trochospiral, equatorial periphery subquadrate, lobulate, four rapidly increasing chambers in the final whorl; slightly flattened on spiral side, elon- gated toward umbilical side; sutures on both umbilical and spiral sides nearly radial, depressed; surface distinctly cancellate with circular pores set in polygonal pore pits; umbilicus wide, deep; aperture interiomarginal, umbilical, covered with a distinct, narrow, protruding umbilical tooth.
Discussion / Comments:
Srinivasan (1975):
Considerable confusion exists in the literature with regard to the identification of Globoquadrina baroemoenensis(LeRoy). This species is common in the Early and Middle Miocene of the Andaman and Nicobar islands. It is apparently closely related to Globoquadrina conglomerata (Schwager), and both of these may be conspecific. Globoquadrina langhiana Cita and Gelati is considered a synonym of G. baroemoenensis, as judged from illustrations published by Jenkins and Orr (1972, pl. 17, figs. 1 1-1 3).
Chaisson & Leckie (1993):
Remarks: This is a medium to large species. There are consistently four chambers in the final whorl. The umbilicus is open and the umbilical faces of the chambers may be somewhat flattened, particularly the final chamber, and perforate. All of the chambers in the final whorl tend to be subround and somewhat laterally compressed. A small umbilical tooth is usually present on the final chamber. Similar species: Kennett and Srinivasan (1983) considered Globoquadrina baroemoenensis to be synonymous with G. conglomerata. The former species, however, can be distinguished by the umbilical flattening of its chambers. G. conglomerata may have only three and a half chambers in the final whorl, whereas G. baroemoenensis always has four. Globoquadrina venezuelana has a more closed umbilicus and more embracing chambers. Globoquadrina dehiscens shows distinct flattening of the apertural face, which is imperforate, and the chambers are more embracing than in G. baroemoenensis.
Quilty (1976):
Remarks: The specimen figured shows well the degree of convergence of G. baroemoenensis and G. larmeui obesa which can occur at markedly different times.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Catapsydracidae
         Genus Globoquadrina
          Species Globoquadrina baroemoenensis
Synonym list:
Kennett & Srinivasan (1983):
1939 Globigerina baroemoenensis Le Roy. - Le Roy : p.263 pl 6 figs 1,2
1960 Globoquadrina langhiana Cita & Gelati. - Cita & Gelati : (junior synonym)
Chaisson & d'Hondt (2000):
1939 Globigerina baroemoenensis Le Roy. - Le Roy : p.263 pl 6, figs 1-2
1983 Globoquadrina baroemoenensis Le Roy. - Kennett & Srinivasan : p.186 pl 6 figs 1-3
Chaisson & Pearson (1997):
1939 Globigerina baroemoenensis Le Roy. - LeRoy : p.263 pl. 6; fig. 1-2
1983 Globoquadrina baroemoenensis Le Roy. - Kennett & Srinivasan : p.186 pl. 6; fig. 1-3
1997 Globoquadrina baroemoenensis Le Roy. - Chaisson & Pearson : p.31 pl. 2; fig. 23
Srinivasan (1975):
1939 Globigerina baroemoenensis Le Roy. - LeRoy : p.263 pl. 6, fig. 1-2
1975 Globoquadrina baroemoenensis Le Roy. - Srinivasan : p.145 pl. 2; fig. 12-14
Vincent & Toumarkine (1990):
1939 Globigerina baroemoenensis Le Roy. - Le Roy : p. 263 pl. 6, figs. 1 and 2
1990 Globoquadrina baroemoenensis Le Roy. - Vincent & Toumarkine : p. 835 pl. 6, figs 11 and 16
Chaisson & Leckie (1993):
1939 Globigerina baroemoenensis Le Roy. - LeRoy : p.263 pl. 6; fig. 1-2
1983 Globoquadrina baroemoenensis Le Roy. - Kennett & Srinivasan : p.186 pl. 6; fig. 1-3
1993 Globoquadrina baroemoenensis Le Roy. - Chaisson & Leckie : p.177 pl. 9; fig. 5-7
Quilty (1976):
1939 Globoquadrina baroemoenensis Le Roy. - LeRoy : p.263 pl. 6, figs. 1-2
1976 Globoquadrina baroemoenensis Le Roy. - Quilty : p.685 pl. 10, fig. 13
Stratigraphy - absolute ages:
LAD: 3.22 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925
References:

Le Roy,L.W. (1939):
Some small foraminifers, ostracoda and otoliths from the Neogene ("Miocene") of the Rokan-Tapanoeli area, Central Sumatra. . Natuurk. Tijdschr. Nederl. Indie Vol. 99

LeRoy,L.W.. (1939):
Some small foraminifera, Ostracoda and otoliths from the Neogene ("Miocene") of the Rokan-Tapanoeli area, central Sumatra . Natuurk. Tijdschr. Nederl.-lndie, Vol. 99(6) p. 215-296

Cita,M.B. and Gelati,R. (1960):
Globoquadrina langhiana n.sp. del Langhiano-tipo . Rivista Italiana di Paleontologia e Stratigrafia Vol. 66 p. 241-246

Srinivasan,M.S. (1975):
Middle Miocene Planktonic Foraminifera from the Hut Bay Formation, Little Andaman Island, Bay of Bengal . Micropaleontology Vol. 21(2) p. 133-150

Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

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

Chaisson,W.P. and Pearson,P.N. (1997):
Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 154 Eds: Shackleton, N.J.Curry, W.B.Richter, C.Bralower, T.J.

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
Anonymous: Unedited TaxonConcept data
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