Welcome to the Forams subsite on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Spirosigmoilinella
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Textulariina
Superfamily:
Lituolacea
Family:
Rzehakinidae
Formal Genus Name and Reference:
Spirosigmoilinella MATSUNAGA, 1955, *1237, p. 49
Type Species:
S. compressa; OD
Images
(Click to enlarge in a new window)
Fig. 134,4. *S. compressa; 4a,b, side and top views showing rounded aperture and slightly inflated central portion due to early sigmoid development, X62 (*2117).
Synonyms
Geographic Distribution
Japan.
Age Range
Beginning Stage in Treatise Usage:
L.Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
M.Mio.
Ending International Stage:
Serravallian
Fraction Up In Ending Stage:
100
Ending Date:
11.63
Description
Early stage sigmoid in development as in Silicosigmoilina, later chambers in single plane; aperture rounded, on short neck, and lacking tooth.
References
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:
Spirosigmoilinella MATSUNAGA, 1955, *1237, p. 49
Type Species:
S. compressa; OD
Images
(Click to enlarge in a new window)
Fig. 134,4. *S. compressa; 4a,b, side and top views showing rounded aperture and slightly inflated central portion due to early sigmoid development, X62 (*2117).
Synonyms
Geographic Distribution
Japan.
Age Range
Beginning Stage in Treatise Usage:
L.Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
M.Mio.
Ending International Stage:
Serravallian
Fraction Up In Ending Stage:
100
Ending Date:
11.63
Description
Early stage sigmoid in development as in Silicosigmoilina, later chambers in single plane; aperture rounded, on short neck, and lacking tooth.