Globorotalia menardii Parker et al. 1865 (TaxonConcept

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Species Globorotalia menardii Parker et al. 1865

Alternative name:

Globorotalia (Menardella) menardii Parker et al. 1865

Diagnosis / Definition:

Stainforth et al. (1978):
Test a medium lenticular trochospire rimmed by a blunt keel. Chambers in last whorl (5 to 6) increase steadily in size and maintain constant shape as added; lunate to crescentic on spiral side, radial segments on umbilical side where posterior overlap makes final chamber more prominent than preceding. Equatorial profile subcircular to rounded‑polygonal; not lobate; axial profile unequally biconvex, chambers of umbilical side more highly vaulted and inflated than those of spiral side. Sutures on spiral side recurved, limbate, more thickened where merging into keel to give “hockey‑stick” appearance. Sutures, especially between early chambers, may be wholly or partly overlapped, (buried) by succeeding chamber. On umbilical side sutures lightly incised, sinuously radial. Umbilicus a narrow stellate pit between slightly swollen chamber tips. Aperture a low arched slit from umbilicus to near periphery, may have light lip. Surface mostly smooth, densely perforate; somewhat pustulose around umbilicus. Observed diameters 0.3 to 0.6 mm.

Discussion / Comments:

Stainforth et al. (1978):
Differentiating characters and relationships of Globorotalia menardii, as proposed herein, have been published previously (Stainforth et al., 1975: 371, 374‑376) with illustrations of virtual topotypes (reworked) from beach sands near Ravenna, Italy (Stainforth et al., fig. 178. 6‑10) and of specimens from several Upper Miocene sections of the Mediterranean area (fig. 179). Although d’Orbigny originally named the species and prepared his model on the basis of specimens from the beach sands near Rimini, Italy (e.g., pl. 2, figs. 1, 2 herein), it seems undesirable to designate a neotype from that locality because of the objective uncertainty as to the stratigraphic position from which the specimens were derived. Thus, a specimen of the same form (pl. 1, fig. 1a‑c) from the Upper Miocene (Tortonian) beds (sample 84 of Borsetti et al., 1975) in the Senigallia section (Borsetti & Catti, 1975) is proposed here as neotype. Abundant subjective interpretation demonstrates that the reworked specimens of this form occurring in the sands near Rimini and Ravenna, Italy, were derived from nearby Tortonian strata. The section from which the proposed neotype was obtained is accurately located and well described, and the stratigraphic level is known precisely.
Chaisson & Leckie (1993):
Remarks: Globorotalia menardii s.l. exhibits considerable morphological variation. It ranges greatly in overall size. Throughout the range of this species, test texture may be quite smooth and glassy to rough and encrusted with secondary calcite. One test texture tends to dominate any given sample. The overall outline of the test ranges from nearly circular to oblate. In edge view the species is biconvex with a keel ranging from heavy to thin. Similar species: Heavily keeled, rough, and encrusted specimens of Globorotalia menardii s.l. can be mistaken for G. tumida, particularly in intervals (e.g., Miocene/Pliocene boundary interval) where all menardiiform specimens are also oblate in outline (e.g., Plate 5, Fig. 8). G. tumida, however, is aysmmetrically biconvex, being more highly vaulted on the ventral side, and it is consistently tumid and tapered in edge view (i.e., swollen on the end opposite the final chamber). G. menardii s.l. is more equally biconvex and is thinner in edge view than the merotumida-plesiotumida- tumida lineage. G. menardii has five to six and a half chambers in its final whorl, whereas G. limbata has seven to eight and G. multicamerata has at least nine chambers in its final whorl. G. pseudomiocenica is very similar to G. menardii s.l. but it tends to have a more circular and less lobate outline and to be more highly vaulted on the umbilical side. G. menardii s.l. has a thicker test than G. pertenuis.

Systematics:

1
Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Globorotalia
          Species Globorotalia menardii

21
  Species Globorotalia menardii

Synonym list:

Stainforth et al. (1978):

1826 Rotalia (Rotalie) menardii d'Orbigny. - d'Orbigny : p.273 [nomen nudum]

1865 Rotalia menardii Parker et al.. - Parker et al. : p.20 pl. 3, fig. 81 [part]

1965 Globorotalia menardii d'Orbigny. - Cita et al. : p.231 pl. 20, fig. 1; pl. 31, fig. 12.

1968 Globorotalia menardii d'Orbigny. - Cita & Premoli Silva : 4-20 pl. 2, fig. 1.

1971 Globorotalia menardii d'Orbigny. - Bizon & Bizon : 86-87 fig. 1-9

1975 Globorotalia menardii Parker et al.. - Stainforth et al. : p. 371-376 fig. 178. 6-10, 179 ex d’Orbigny

1978 Globorotalia menardii Parker et al.. - Stainforth et al. : Plates 1, 2 ex d’Orbigny

Srinivasan (1975):

1865 Rotalia menardii Parker et al.. - Parker et al. : p.20 pl. 3; fig. 81

1975 Globorotalia menardii Parker et al.. - Srinivasan : p.147 pl. 3; fig. 19

Vincent & Toumarkine (1990):

1865 Rotalia menardii Parker et al.. - Parker et al. : p. 20 pl. 3, fig. 81

1884 Pulvinulina menardii var. fimbriata Brady. - Brady : p. 691 pl. 103, fig. 3

1990 Globorotalia menardii Parker et al.. - Vincent & Toumarkine : p. 833 pl. 4, figs. 10-18, 22 and 23

Chaisson & Leckie (1993):

1865 Rotalia menardii Parker et al.. - Parker et al. : p.20 pl. 3; fig. 81

1983 Globorotalia (Menardella) menardii Parker et al.. - Kennett & Srinivasan : p.124 pl. 28, fig. 2; pl. 29, fig. 1-3

1985 Rotalia menardii Parker et al.. - Bolli & Saunders : p.220 fig. 34.1-10

1993 Globorotalia menardii sensu lato Parker et al.. - Chaisson & Leckie : p.173 pl. 5; fig. 7-9 and 15

Was used in synonym list of:

Globorotalia menardii menardii Parker et al. 1865

References:

d'Orbigny,A.D. (1826):
Tableau méthodique de la classe des céphalopodes . Ann. Sci. Nat. Paris, Ser 1 Vol. 7 p. 96-314

Parker,W.K.; Jones,T.R. and Brady,H.B. (1865):
On the nomenclature of the foraminifers, Part XII. The species enumerated by d’Orbigny in the "Annales des Sciences Naturelles, vol. 7, 1826." . Ann. Mag. Nat. Hist., Ser 3 Vol. 16(3) p. 15-41

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

Cita,M.B.; Premoli Silva,I. and Rossi,R.C. (1965):
Foraminiferi planctonici del Tortoniano-tipo . Rivista Italiana di Paleontologia e Stratigrafia Vol. 71 p. 217‑308

Cita,M.B. and Premoli Silva,I. (1968):
Evolution of the planktonic foraminiferal assemblages in the stratigraphic interval between the type‑Langhian and type‑Tortonian and biozonation of the Miocene of Piedmont . Giornale di Geologia Vol. 35(3) p. 1‑39

Bizon,G. and Bizon,J.J. (1971):
Observations sur l’évolution de Globorotalia "menardii" dans le miocène moyen et supérieur d'Espagne méridionale . 2nd Internationmall. Conf. Planktonic Microfossils Vol. 1 p. 85‑93

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

Stainforth,R.M.; Lamb,J.L.; Luterbacher,H.P.; Beard,J.H. and Jeffords,R.M. (1975):
Cenozoic planktonic foraminiferal zonation and characteristics of index forms . Paleontological ContributionsArticle 62 p. 425

Stainforth,R.M.; Lamb,J.L. and Jeffords,R.M. (1978):
Rotalia menardii Parker, Jones & Brady, 1865 (Foraminiferida): Proposed suppression of lectotype and designation of neotype Z.N.(S.) 2145 . Bull. Zool. Nomencl. Vol. 34(4) p. 252-262

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

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