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Species Turborotalita humilis Brady 1884


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test minute, low trochospiral, equatorial periphery almost circular, lobulate; axial periphery rounded; six subspherical chambers in the final whorl, increasing uniformly in size as added; tongue-like extension of the final chamber over the umbilicus having several infralaminal apertures; sutures radial and depressed; surface smooth, very finely perforate, larger pores concentrated along the periphery; aperture (except when covered by bulla) interiomarginal, umbilical-extraumbilical.
Discussion / Comments:
Kennett & Srinivasan (1983):
Ta. humilis is distinguished from Globigerina (Globigerina) quinqueloba by its smaller size, more numerous chambers in the final whorl, and microperforate wall and larger pores concentrated along the periphery.
Bolli & Saunders (1985):
The original illustration by Brady is not repeated here as the nature of the umbilical side was completely missed in this very small species. Many conspecific, specimens were available in Brady's slides and Banner & Blow (1960a) chose a lectotype which they later (Blow & Banner, 1962, p. 122) placed in a new genus, Turborotalita. As in Globigerinita naparimaensis, the last chamber in this species is modified to form an extensive bulla that wraps over the umbilicus and ends in a series of finger like extensions over the sutures. Apertures are usually separate at the end of each extension though they might combine in some instances. Earlier apertures are thought to be umbilical extraumbilical. Globigerinita parkerae Loeblich & Tappan may he a junior synonym of T. humilis.
Chaisson & Leckie (1993):
Similar species: T. humilis differs from Globigerina quinqueloba in its more oblate shape and more numerous chambers in the final whorl (typically six to seven).
Synonym list:
Kennett & Srinivasan (1983):
1884 Truncatulina humilis Brady. - Brady : p.665 pl 94 fig 7
Bolli & Saunders (1985):
1884 Truncatulina humilis Brady. - Brady : p.665 pl. 94, fig. 7
1960 Globigerinita humilis Brady. - Banner & Blow : p.36 pl. 8, fig. 1 Lectotype
1985 Turborotalita humilis Brady. - Bolli & Saunders : p.187 figs. 17.9; 7,9,12
Chaisson & Pearson (1997):
1884 Truncatulina humilis Brady. - Brady : p.36 pl. 8; fig. 1 (lectotype)
1983 Turborotalita humilis Brady. - Kennett & Srinivasan : p.167 pl. 41; fig. 1, 3-5
Chaisson & Leckie (1993):
1884 Truncatulina humilis Brady. - Brady : p.36 pl. 8; fig. 1 (lectotype)
1983 Turborotalita humilis Brady. - Kennett & Srinivasan : p.167 pl. 41; fig. 1 and 3-5
Quilty (1976):
1884 Turborotalita humilis Brady. - Brady : p.665 pl. 94, figs. 7a-c
1960 Turborotalita humilis Brady. - Banner & Blow : p.10 pl. 7, figs. 5a-c
1976 Turborotalita humilis Brady. - Quilty : p.697 pl. 16, figs. 10-11
References:

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

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

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.

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

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.
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