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Species Globorotalia lenguaensis Bolli 1957


Alternative name:
Globorotalia (Globorotalia) lenguaensis Bolli 1957
Diagnosis / Definition:
Bolli & Saunders (1985):
This small, compact species first described from the Middle Miocene Lengua Formation (Globorotalia mayeri and Globorotalia menardii zones) of Trinidad has subsequently been reported from Venezuela (Blow, 1959), where it was used as a subzonal marker, from Japan (Saito, 1963), Java (Bolli, 1966b), Italy (Cita & Premoli Silva, 1967), Gulf of Mexico (Stainforth et al., 1975), Sakhalin (Serova, 1977) and from DSDP sites. The general consensus is that the range of G. lenguaensis in low latitudes is limited mainly to the Middle Miocene Globorotalia mayeri and menardii zones, but continues into the Globorotalia acostaensis Zone (Bolli, 1966b) and, according to Blow (1969), even in his N 17 Zone (= Globorotalia humerosa Zone). According to the latter author, the species appears as early as within N 12 (Globorotalia fohsi robusta Zone). This cosmopolitan species may be regarded as a useful additional index for the late Middle and early Late Miocene ~ this has been confirmed particularly for the Mediterranean area.
Bolli (1957):
Shape of test low trochospiral; equatorial periphery almost circular, not or only very slightly lobate; axial periphery angular to subangular, often with a faint keel. Wall calcareous, finely perforate, surface smooth. Chambers strongly compressed; 15-20, arranged in 2 1/2 -3 whorls; the 6-7 chambers of the last whorl increase moderately in size. Sutures on spiral side strongly curved, occasionally slightly depressed; on umbilical side radial to slightly sigmoidal, depressed. Umbilicus very narrow, almost closed. Aperture a low arch often with a lip; interiomarginal, umbilical extraumbilical. Coiling apparently random in the Globorotalia mayeri zone; almost exclusively sinistral in the Globorotalia menardii zone. Largest diameter of holotype 0.3 mm.
Discussion / Comments:
Bolli & Saunders (1985):
G. lenguaensis is a small, rather flat species with a circular, barely lobate outline and with a subangular to angular periphery with only a faint keel, 6-7 chambers in the last whorl. The test wall is smooth and glassy with distinct, well separated pores. It is randomly coiled in its early range and becomes strongly sinistral later. Stainforth et a]. regard G. lenguaensis as intermediate between G. minima Akers and G. merotumida Blow & Banner. We doubt its origin from G. canariensis var. minima of Akers as the main development of the latter form is in the Gulf Coast equivalent of the G. fohsi peripheroronda Zone after which it becomes very rare according to its author. In contrast, G. lenguaensis begins in the G. mayeri Zone or, at the earliest, in the G. fohsi robusta Zone. In our opinion G. lenguaensis does not belong to the menardiform plexus and therefore did not give rise to G. merotumida, from which it differs in its smaller size, nearly circular against elongated equatorial circumference, in not being as high on the umbilical side and in possessing a much weaker peripheral keel. The range of Blow's G. paralenguaensis, which he considered as a link with G. merotumida, falls within that of G. lenguaensis. We consider it a variant within G. lenguaensis.
Chaisson & Pearson (1997):
The FO of this species was located shipboard. It is not observed between Sample 154-925B-32H-2, 65-67 cm, and 27H-5, 65-67 cm.
Bolli (1957):
Globorotalia lenguaensis, new species, resembles G. canariensis var. minima Akers but differs in its less convex umbilical side and more circular equatorial periphery. G. canariensis var. minima has been described from the Cibicides carstensi var. opimus zone (Globorotalia fohsi barisanensis zone to Globorotalia fohsi fohsi zone of the Cipero formation), whereas Globorotalia lenguaensis is restricted to the Lengua formation. The new species differs from G. menardii (d'Orbigny) in its smaller size, less lobate and more circular equatorial periphery.
Srinivasan (1975):
Characterized by almost circular equatorial periphery, strongly curved sutures on dorsal side, on umbilical side nearly radial and depressed. A few individuals have a sharp peripheral keel.
Chaisson & Leckie (1993):
Remarks: Occasionally a common species, particularly in the upper part of Zone N12 and the lower part of Zone N13. Its ultrastructure is very similar to the G. fohsi group. G. lenguaensis seems prone to dissolution, and the inner whorls on the spiral side are often corroded and pitted. Blow (1969) and Kennett and Srinivasan (1983) suggest that Globorotalia paralenguaensis is an evolutionary intermediate between G. lenguaensis and G. merotumida. G. lenguanensis is circular in outline, whereas G. paralenguaensis is more oblate. However, both forms co-occur throughout their range, and they are highly gradational at this site; therefore, the two were not separated. G. lenguaensis s.l. is characterized by its smooth, finely perforate test and imperforate peripheral band. The peripheral outline varies from rounded to subangular. Similar species: G. lenguaensis s.l. differs from G. merotumida in possessing more numerous chambers, typically six to six and a half as opposed to five to five and a half, and in lacking a raised keel. G. lenguaensis s.l. closely resembles the G. fohsi group in Zone N12, but it is distinguished by its smaller size and absence of a raised keel.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Globorotalia
          Species Globorotalia lenguaensis
Synonym list:
Chaisson & d'Hondt (2000):
1957 Globorotalia lenguaensis Bolli. - Bolli : p.120 pl 29 figs 5a-c
1969 Globorotalia (Globorotalia) paralenguaensis Blow. - Blow : p.402 pl 46 figs 1-6
1983 Globorotalia (Globorotalia) lenguaensis Bolli. - Kennett & Srinivasan : p.152 pl 29 figs 5a-c
1983 Globorotalia (Globorotalia) paralenguaensis Blow. - Kennett & Srinivasan : p.154 pl 37 figs 1-3
Bolli & Saunders (1985):
1957 Globorotalia lenguaensis Bolli. - Bolli : p.120 pl.29, figs.5a-c
1985 Globorotalia lenguaensis Bolli. - Bolli & Saunders : p.218 figs. 30.25; 6,10,12
Chaisson & Pearson (1997):
1957 Globorotalia lenguaensis Bolli. - Bolli : p.120 pl. 29; fig. 5a-c
1969 Globorotalia (Globorotalia) paralenguaensis Blow. - Blow : p.402 pl. 46; fig. 1-6
1983 Globorotalia (Globorotalia) lenguaensis Bolli. - Kennett & Srinivasan : p.152 pl. 29; fig. 5a-c
1983 Globorotalia (Globorotalia) paralenguaensis Blow. - Kennett & Srinivasan : p.154 pl. 37; fig. 1-3
Bolli (1957):
1957 Globorotalia lenguaensis Bolli. - Bolli : pl. 29, figs. 5a-c new species
Srinivasan (1975):
1957 Globorotalia lenguaensis Bolli. - Bolli : p.120 pl. 29; fig. 5
1975 Globorotalia aff. lenguaensis Bolli. - Srinivasan : p.147 pl. 3; fig. 13-14
Chaisson & Leckie (1993):
1957 Globorotalia lenguaensis Bolli. - Bolli : p.120 pl. 29; fig. 5a-c
1969 Globorotalia (Globorotalia) paralenguaensis Blow. - Blow : p.402 pl. 46; fig. 1-6
1983 Globorotalia (Globorotalia) lenguaensis Bolli. - Kennett & Srinivasan : p.152 pl. 29; fig. 5a-c
1983 Globorotalia (Globorotalia) paralenguaensis Blow. - Kennett & Srinivasan : p.154 pl. 37; fig. 1-3
1993 Globorotalia lenguaensis sensu lato Bolli. - Chaisson & Leckie : p.175 pl. 7; fig. 16-20
Was used in synonym list of:
Globorotalia (Globorotalia) lenguaensis Bolli 1957
Stratigraphy - absolute ages:
LAD: 6 ± 0 [Ma], Berggren et al. (1995)
FAD: 13.57 ± 0.04 [Ma], Chaisson & d'Hondt (2000) ODP Leg 165 Site 999
FAD: 12.85 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925
References:

Bolli,H.M. (1957):
The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad, B.W.I . Bulletin of the U.S. National Museum Vol. 215 p. 61-82

Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

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.

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

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54

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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