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Sigmoilina
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Miliolina
Superfamily:
Miliolacea
Family:
Miliolidae
Subfamily:
Quinqueloculininae
Formal Genus Name and Reference:
Sigmoilina SCHLUMBERGER, 1887, *1651, p. 118
Type Species:
Planispirina sigmoidea BRADY, 1884, *200, p. 197; SD CUSHMAN, 1917, *404f, p. 60
Images
(Click to enlarge in a new window)
Fig. 353,1. *5. sigmoidea (BRADY), Rec., Carib.; 1a-c, opposite sides and top view of hypotype, X46 (*2117); 1d, sec. showing chamber arrangement, X55 (*1651).
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
M.Eoc.
Beginning International Stage:
Lutetian
Fraction Up In Beginning Stage:
0
Beginning Date:
48.07
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, ovate in outline, in microspheric generation with earliest chambers opposite, then with plane of chamber addition changing so that it forms sigmoid curve, successive chambers at first in planes about 120 0 apart but angle gradually enlarging to 1800 in adult stage, chambers with broad lateral extensions which obscure all preceding chambers except penultimate one, giving external biloculine appearance; wall calcareous, thick, imperforate, porcelaneous; aperture terminal, rounded, with tooth. [Differs from Pyrgo in having a gradual change from a pseudoquin queloculine stage to one with chambers added 180° apart, so that the changing plane of coiling forms a sigmoid curve.]
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Miliolina
Superfamily:
Miliolacea
Family:
Miliolidae
Subfamily:
Quinqueloculininae
Formal Genus Name and Reference:
Sigmoilina SCHLUMBERGER, 1887, *1651, p. 118
Type Species:
Planispirina sigmoidea BRADY, 1884, *200, p. 197; SD CUSHMAN, 1917, *404f, p. 60
Images
(Click to enlarge in a new window)
Fig. 353,1. *5. sigmoidea (BRADY), Rec., Carib.; 1a-c, opposite sides and top view of hypotype, X46 (*2117); 1d, sec. showing chamber arrangement, X55 (*1651).
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
M.Eoc.
Beginning International Stage:
Lutetian
Fraction Up In Beginning Stage:
0
Beginning Date:
48.07
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, ovate in outline, in microspheric generation with earliest chambers opposite, then with plane of chamber addition changing so that it forms sigmoid curve, successive chambers at first in planes about 120 0 apart but angle gradually enlarging to 1800 in adult stage, chambers with broad lateral extensions which obscure all preceding chambers except penultimate one, giving external biloculine appearance; wall calcareous, thick, imperforate, porcelaneous; aperture terminal, rounded, with tooth. [Differs from Pyrgo in having a gradual change from a pseudoquin queloculine stage to one with chambers added 180° apart, so that the changing plane of coiling forms a sigmoid curve.]