Globorotalia obesa Bolli 1957 (TaxonConcept

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Species Globorotalia obesa Bolli 1957

Alternative name:

Globorotalia (Turborotalia) obesa Bolli 1957

Diagnosis / Definition:

Bolli (1957):
Shape of test very low trochospiral; equatorial periphery strongly lobate; axial periphery rounded. Wall calcareous, perforate, surface finely pitted, in well preserved specimens with fine, short spines. Chambers strongly inflated, spherical; 10-12, arranged in 2-2 1/2 whorls; the 4-4 1/2 chambers of the last whorl increase rapidly in size. Sutures on spiral side radial, strongly depressed; on umbilical side radial, strongly depressed. Umbilicus fairly wide, deep. Aperture a medium to high arch without lip or rim; interiomarginal, umbilical extraumbilical. Coiling random. Largest diameter of holotype 0.5 mm.

Discussion / Comments:

Bolli & Saunders (1985):
The last whorl of G. obesa is formed by 4 globular chambers, rapidly increasing in size and separated by deeply incised sutures resulting in a distinctly lobate equatorial periphery. These are the criteria by which the species is distinguished from other Oligocene Miocene non carinate Globorotalia species, including G. continuosa; this species also possesses 4 chambers but these are more ovate and less inflated.
Bolli (1957):
Globorotalia. obesa, new species, differs from G. mayeri Cushman and Ellisor in having fewer and more inflated chambers in the last whorl.

Systematics:

32
Familia Globorotaliidae
Genus Globorotalia
Species Globorotalia obesa

Synonym list:

Bolli & Saunders (1985):

1985 Globorotalia obesa Bolli. - Bolli & Saunders : p.204 figs. 26.44; 6,9,12

Bolli (1957):

1957 Globorotalia obesa Bolli. - Bolli : pl. 29, figs. 2a-3 new species

Srinivasan (1975):

1957 Globorotalia obesa Bolli. - Bolli : p.119 pl. 29; fig. 2-3

1975 Globorotalia obesa Bolli. - Srinivasan : p.149 pl. 4; fig. 17-18

Was used in synonym list of:

Globigerinella obesa 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

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

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

Anonymous: Unedited TaxonConcept data

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