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Silicosigmoilina
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Textulariina
Superfamily:
Lituolacea
Family:
Rzehakinidae
Formal Genus Name and Reference:
Silicosigmoilina Cushman & CHURCH, 1929, *500, p. 502
Type Species:
S. californica, OD
Images
(Click to enlarge in a new window)
Fig. 133,4. *S. californica, U.Cret., USA (Calif.) ; 4a,b, side and top views of paratype showing aperture and short toothlike projection, X66 (*2117). --Fig. 133,5. S. perplexa ISRAELSKY, Paleoc., USA (Calif.); 5a-c, opposite sides and top view of holotype, X143 (*2117).
Synonyms
Geographic Distribution
N.Am.-S.Am.-Japan-Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Paleoc.
Ending International Stage:
Thanetian
Fraction Up In Ending Stage:
100
Ending Date:
56
Description
Test with chambers half coil in length, planispirally arranged in early stages, later sigmoid, aperture described as lacking tooth, but small tooth or infolding of inner margin occurs in young specimens, slight compression of aperture in later stages obscuring its character somewhat. [Bramletteia was described as a subgenus for the species with J "toothlike" projection at the aperture. As this is also found in the type-species of Silicosigmoilina, the generic definition only requires modification and Bramletteia is a synonym.]
References
$\qquad$ , \& Church, C. C., 1929, Some Upper Cretaceous Foraminifera trom near Coalinga, California: Calif. Acad. Sci., Proc., ser. 4, v. 18, no. 16, p. 497-530, pl. 36-41.
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Textulariina
Superfamily:
Lituolacea
Family:
Rzehakinidae
Formal Genus Name and Reference:
Silicosigmoilina Cushman & CHURCH, 1929, *500, p. 502
Type Species:
S. californica, OD
Images
(Click to enlarge in a new window)
Fig. 133,4. *S. californica, U.Cret., USA (Calif.) ; 4a,b, side and top views of paratype showing aperture and short toothlike projection, X66 (*2117). --Fig. 133,5. S. perplexa ISRAELSKY, Paleoc., USA (Calif.); 5a-c, opposite sides and top view of holotype, X143 (*2117).
Synonyms
Geographic Distribution
N.Am.-S.Am.-Japan-Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Paleoc.
Ending International Stage:
Thanetian
Fraction Up In Ending Stage:
100
Ending Date:
56
Description
Test with chambers half coil in length, planispirally arranged in early stages, later sigmoid, aperture described as lacking tooth, but small tooth or infolding of inner margin occurs in young specimens, slight compression of aperture in later stages obscuring its character somewhat. [Bramletteia was described as a subgenus for the species with J "toothlike" projection at the aperture. As this is also found in the type-species of Silicosigmoilina, the generic definition only requires modification and Bramletteia is a synonym.]
References
$\qquad$ , \& Church, C. C., 1929, Some Upper Cretaceous Foraminifera trom near Coalinga, California: Calif. Acad. Sci., Proc., ser. 4, v. 18, no. 16, p. 497-530, pl. 36-41.