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Species Truncorotaloides topilensis Cushman 1925


Discussion / Comments:
Toumarkine & Luterbacher (1985):
This is one of the most distinctive species of the Middle Eocene. T. topilensis differs from T. rohri by its angular profile accentuated by spines, and in having only 4 chambers in the last whorl. These 4 chambers are at right angles to each other and increase rapidly in size. The younger chambers, at least the last two, have a very characteristic shape with flattened peripheral margins emphasized by a rim of spines and pustules. The shape of the chambers of T. haynesi and T. libyaensis is close to that of T. topilensis but they have 6 and 5 instead of 4 chambers in the last whorl.
Bolli (1957):
The Trinidad specimens of Truncorotaloides topilensis (Cushman) compare closely with the holotype of Globigerina topilensis Cushman, except that many specimens possess sutural, supplementary apertures on the spiral side, such as characterize the genus Truncorotaloides
Van Eijden & Smit (1991):
Remarks. T. topilensis is rare and not quite typically developed in Sample 121-757B-17H-CC.
Systematics:

15
 Classis Foraminifera
  Genus Globigerinatheka
   Species Truncorotaloides topilensis

24
  Genus Truncorotaloides
   Species Truncorotaloides topilensis

32
 Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Truncorotaloides
    Species Truncorotaloides topilensis
Synonym list:
Toumarkine & Luterbacher (1985):
1925 Globigerina topilensis Cushman. - Cushman : p.7 pl 1 fig 9 (type reference)
1985 Truncorotaloides topilensis Cushman. - Toumarkine & Luterbacher : 133-134 figs 32.1, 33.1-7
Bolli (1957):
1925 Truncorotaloides topilensis Cushman. - Cushman : p. 7 pl. 1, figs. 9a-c
1957 Globigerina topilensis Cushman. - Bolli : p. 276 pl. 39, figs. 13-16b
Van Eijden & Smit (1991):
1925 Globigerina topilensis Cushman. - Cushman : p.7 pl. 1, fig. 9
1991 Truncorotaloides topilensis Cushman. - Van Eijden & Smit : p.114
Was used in synonym list of:
Acarinina topilensis Cushman 1925
References:

Cushman,J.A. (1925):
Some new foraminfera from the Velasco Shale of Mexico . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 1 p. 18-23

Cushman,J.A. (1925):
New foraminifera from the Upper Eocene of Mexico . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 1 p. 4-9

Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172

Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154

Van Eijden,A.J.M. and Smit,J. (1991):
Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 121 Eds: Weissel, J.Peirce, J.Taylor, E.Alt, J. p. 77-123
Anonymous: Unedited TaxonConcept data
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