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Species Globigerinella aequilateralis Brady 1879


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral in the early stage, nearly planispiral in the adult, evolute; equatorial periphery distinctly lobulate; axial periphery broadly rounded; chambers globular to subglobular, five to six rapidly enlarging chambers in the final whorl; sutures radial, depressed; surface finely h'spid and densely perforate, spinose; spines simple rounded, which become triradiate with growth; surface with uniformly distributed circular pores, interpore area almost smooth; aperture in the adult interiomarginal, wide equatorial arch without a lip or rim.
Discussion / Comments:
Chaisson & Pearson (1997):
Fully planispiral adult Ge. aequilateralis make their first appearance in Sample 154-925B-26H-5, 65-67 cm. This marks the completion of the morphological transition at Site 925 from Ge. praesiphonifera to Ge. aequilateralis, slightly later (Zone N16) than the global transition in Zone N12 (Kennett and Srinivasan, 1983; Bolli and Saunders, 1985). Globigerinella (= Hastigerina) aequilateralis and Globigerinella (= Hastigerina) siphonifera (Globigerinella aequilateralis ‘A’ and ‘B’) were not distinguished in this study (cf. Bolli and Saunders, 1985).
Chaisson & Leckie (1993):
Remarks: This species is sporadically numerous.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinella
          Species Globigerinella aequilateralis
Synonym list:
Kennett & Srinivasan (1983):
1879 Globigerina aequilateralis Brady. - Brady : p.285
Chaisson & d'Hondt (2000):
1879 Globigerina aequilateralis Brady. - Brady : p 285
1983 Globigerinella aequilateralis Brady. - Kennett & Srinivasan : p.238 pl 59 fig 1, pl 60, figs 4-6
Chaisson & Pearson (1997):
1884 Globigerina aequilateralis Brady. - Brady : pl. 80; fig. 18-21
1983 Globigerinella aequilateralis Brady. - Kennett & Srinivasan : p.238 pl. 59, fig. 1; pl. 60, fig. 4-6
Srinivasan (1975):
1884 Globigerinella aequilateralis Brady. - Brady : p.605 Pl. 80; Fig. 18a-b, 19a-b, 20-21
1975 Globigerinella aequilateralis Brady. - Srinivasan : p.149 Pl. 4; Fig. 4
Chaisson & Leckie (1993):
1879 Globigerina aequilateralis Brady. - Brady : p.285 (fig. in Brady, 1884; pl. 80, fig. 18-21)
1983 Globigerinella aequilateralis Brady. - Kennett & Srinivasan : p.238 pl. 59, fig. 1; pl. 60, fig. 4-6
1993 Globigerinella aequilateralis Brady. - Chaisson & Leckie : p.169 pl. 1; fig. 1-2
Was used in synonym list of:
Hastigerina aequilateralis Brady 1879
References:

Brady,H.B. (1879):
Notes on some of the reticularean Rhizopoda of the Challenger Expedition, Part II. Additions to the knowledge of the porcellanous and hyaline types. . Q. J. Microsc. Sci. Vol. 19

Brady,H.B. (1884):
Report on the foraminifera dredged by H.M.S. Challenger during the years 1873-1876.
In: Report of the scientific results of the voyage of H.M.S. Challenger, 1873-1876, Zoology Vol. 9 p. 1-814

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

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

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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