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Species Globorotalia elongata Glaessner 1937


Alternative name:
Globorotalia (Globorotalia) elongata Glaessner 1937
Diagnosis / Definition:
Bolli (1957):
Shape of test very low trochospiral, compressed, spiral side often slightly concave, umbilical side moderately convex; equatorial periphery slightly lobate, elongate; axial periphery subacute to acute but without keel. Wall calcareous, perforate, surface smooth. Chambers moderately to strongly compressed; about 12, arranged in 2-2 1/2 whorls, the 6 chambers of the last whorl increasing rapidly in size. Sutures on spiral side slightly curved, distinctly depressed; on umbilical side radial, distinctly depressed. Umbilicus fairly wide, open. Aperture a low arch, interiomarginal, extraumbilical umbilical. Coiling random. Largest diameter of figured hypotype 0.33 min.
Discussion / Comments:
Bolli (1957):
Globorotalia elongata Glaessner is probably closely related to the G. ehrenbergi Bolli, new speciesG. pseudomenardii Bolli, new species, group. From G. ehrenbergi, it is distinguished by the more elongate equatorial periphery caused by the rapid increase in size of the ultimate and often also the penultimate chamber. From G. pseudomenardii it is distinguished by the more depressed sutures on the spiral side. The final whorl consists of 6 chambers, instead of 5 as in the other two species and the early portion is depressed in relation to the chambers of the last whorl on the spiral side.
Systematics:

20
 Genus Globorotalia
  Species Globorotalia compressa
   Species Globorotalia velascoensis
Synonym list:
Bolli (1957):
1937 Globorotalia elongata Glaessner. - Glaessner : p. 33 figs. 3d-f
1957 Globorotalia elongata Glaessner. - Bolli : pl. 20, figs. 11-13
Was used in synonym list of:
Globanomalina chapmani Parr 1938
References:

Glaessner,M.F. (1937):
Studien über Foraminifern aus der Kreide und dem Teritär des Kaukasus . Probl. Paleontol., Moscow Univ. Lab. Paleontol.2-3 p. 349-410

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
Anonymous: Unedited TaxonConcept data
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