Truncorotaloides rohri Brönnimann & Bermudez 1953 (TaxonConcept

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Species Truncorotaloides rohri Brönnimann & Bermudez 1953

Discussion / Comments:

Toumarkine & Luterbacher (1985):
T. rohri is strongly spinose, especially on the umbilical shoulders and around the peripheral margin and has a flattened spiral side. Bronnimann & Bermudez (1953) described, together with the species rohri, three varieties: T. rohri var. guaracaraensis (Fig. 32.12), T. rohri var. piparoensis (Fig. 32.11), T. rohri var. mayoensis (Fig. 32.10). They differ from each other by the shape of the chambers of the last whorl (completely rounded for guaracaraensis to angular for mayoensis), but they are linked by transitional forms which are difficult to distinguish. We retain only the species rohri. T. rohri has a rounder axial periphery than T. topilensis, T. libyaensis or T. haynesi. Its chambers are less angular and increase more regularly in size. It differs from T. collactea in its larger size, and the more spinose and less compact test.
Bolli (1957):
In addition to Truncorotaloides rohri, Bronnimann and Bermudez (1953) described three varieties of this species which illustrate the variation of chamber and test shape ranging from rounded to angular forms. In T. rohri var. guaracaraensis are included specimens with spherical chambers. T. rohri var. piparoensis is an intermediate form between T. rohri var. guaracaraensis and T. rohri. The chambers of T. rohri var. mayoensis are angular conical, the test umbilicoconvex. This variety may be regarded as related to T. topilensis (Cushman).

Systematics:

15
Classis Foraminifera
  Genus Truncorotaloides
   Species Truncorotaloides rohri

24
  Genus Truncorotaloides
   Species Truncorotaloides rohri

32
Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Truncorotaloides
    Species Truncorotaloides rohri

Synonym list:

Toumarkine & Luterbacher (1985):

1953 Truncorotaloides rohri Brönnimann & Bermudez. - Brönnimann & Bermudez : p.818 pl 87 figs 7-9 (type reference)

1985 Truncorotaloides rohri Brönnimann & Bermudez. - Toumarkine & Luterbacher : 133- 134 figs 32.8-9, 33.12-18

Bolli (1957):

1953 Truncorotaloides rohri Brönnimann & Bermudez. - Brönnimann & Bermudez : pp. 818-819 pl. 87, figs. 7-9

1953 Truncorotaloides rohri Brönnimann & Bermudez. - Beckmann : p. 396 pl. 26, figs. 10-11

1957 Truncorotaloides rohri Brönnimann & Bermudez. - Bolli : p. 276 pl. 39, figs. 8-12c

1957 Truncorotaloides rohri Brönnimann & Bermudez. - Bolli et al. : p. 42 pl. 10, figs. 5a-c

Van Eijden & Smit (1991):

1953 Truncorotaloides rohri Brönnimann & Bermudez. - Brönnimann & Bermudez : 818-819 pl. 87, figs. 7-9

1991 Truncorotaloides rohri Brönnimann & Bermudez. - Van Eijden & Smit : p.114

Was used in synonym list of:

Acarinina rohri Brönnimann & Bermudez 1953

References:

Brönnimann,P. and Bermudez,P.J. (1953):
Truncorotaloides, a new foraminiferal genus from the Eocene of Trinidad, B.W.I . Journal of Paleontology Vol. 27(6) p. 817-820

Beckmann,J.P. (1953):
Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados, Kl. Antillen . Ecoglae geologicae Helvetiae Vol. 46 p. 301-412

Bolli,H.M.; Loeblich,A.R. and Tappan,H. (1957):
The Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae, and Globotruncanidae . U.S. National Museum Bull. Vol. 215 p. 3-50

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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