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Species Globorotalia archeomenardii Bolli 1957


Alternative name:
Globorotalia (Menardella) archeomenardii Bolli 1957
Diagnosis / Definition:
Bolli (1957):
Shape of test low trochospiral, compressed; equatorial periphery slightly lobate; axial periphery acute with a thin but distinct keel. Wall calcareous, very finely perforate, surface smooth. Chambers angular rhomboid, strongly compressed; 12-15, arranged in about 3 whorls, the 4-5 chambers of the last whorl increase fairly rapidly in size. Sutures on spiral side strongly curved; on umbilical side radial to slightly curved, depressed. Umbilicus small, fairly shallow. Aperture a low slit; interiomarginal, umbilical extraumbilical. Coiling random. Largest diameter of holotype 0.3 mm.
Discussion / Comments:
Bolli & Saunders (1985):
This small species with a diameter of only about 0.3 mm possesses thin chamber walls and a delicate keel. Furthermore, compared with the considerably larger G. praemenardii, its spiral side appears more convex and the equatorial periphery less lobate.
Bolli (1957):
Globorotalia archeomenardii, new species, is distinguished from G. menardii (d'Orbigny) and G. praemenardii Cushman and Stainforth by having a more convex spiral side and in being less lobate. The range in size of the specimens of the new species is very small in contrast to that of the other two species. Typical G. archeomenardii disappear with the first appearance of G. praemenardii. It is probably the ancestor of the G. praemenardii menardii suite.
Chaisson & Leckie (1993):
Similar species: Globorotalia archeomenardii has a distinctly more biconvex test and angular peripheral margin than its ancestor Globorotalia praescitula (Kennett and Srinivasan, 1983), and it is more convex on the spiral side than its descendant G. praemenardii. In addition, G. archeomenardii also has more chambers than G. praescitula (five to five and a half, compared with four to four and a half), and it lacks the raised dorsal sutures and well-developed peripheral keel characteristic of G. praemenardii.
Synonym list:
Bolli & Saunders (1985):
1957 Globorotalia archeomenardii Bolli. - Bolli : p.119 pl.28, figs.11a-c
1985 Globorotalia archeomenardii Bolli. - Bolli & Saunders : p.224 figs. 32.6; 9,12
Bolli (1957):
1957 Globorotalia archeomenardii Bolli. - Bolli : pl. 28, figs. 11a-c new species
Vincent & Toumarkine (1990):
1957 Globorotalia archeomenardii Bolli. - Bolli : p. 119 pl. 28, fig 11
1990 Globorotalia archeomenardii Bolli. - Vincent & Toumarkine : p. 802
Chaisson & Leckie (1993):
1957 Globorotalia archeomenardii Bolli. - Bolli : p.119 pl. 28; fig. 11a-c
1983 Globorotalia (Menardella) archeomenardii Bolli. - Kennett & Srinivasan : p.122 pl. 28; fig. 3-5
1985 Globorotalia archeomenardii Bolli. - Bolli & Saunders : p.220 fig. 32.6a-c
1993 Globorotalia archeomenardii Bolli. - Chaisson & Leckie : p.173 pl. 5; fig. 16-20
Was used in synonym list of:
Menardella archeomenardii Bolli 1957
Globorotalia (Menardella) archeomenardii Bolli 1957
References:

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

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

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
Anonymous: Unedited TaxonConcept data
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