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Tetrataxis
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Fusulinina
Superfamily:
Endothyracea
Family:
Tetrataxidae
Formal Genus Name and Reference:
Tetrataxis EHRENBERG, 1854, *680, p. 24
Type Species:
T. conica, OD (M)
Images
(Click to enlarge in a new window)
Fig. 253,1. *T. conica, Carb., Brit.I; 1a-c, spiral, umbilical, and edge views, X51 (*2117).
Synonyms
Tetrataxis
Geographic Distribution
N.Am.-Eu.-Japan
Age Range
Beginning Stage in Treatise Usage:
Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Test free, trochospirally coiled, with all of numerous broad, low chambers visible on spiral side, and only rather few (commonly 4) of final whorl visible on umbilical side, umbilical cavity broad; wall calcareous, with 2 distinct layers, outer one microgranular and inner fibrous; aperture umbilical. [RlIditaxis is based on the type species Valvlllina mdis BRADY. His original specimens of this species in the British Museum (Natural History) are crushed internal casts, probably of Tetfataxis. The genera are here regarded as synonymous.]
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Fusulinina
Superfamily:
Endothyracea
Family:
Tetrataxidae
Formal Genus Name and Reference:
Tetrataxis EHRENBERG, 1854, *680, p. 24
Type Species:
T. conica, OD (M)
Images
(Click to enlarge in a new window)
Fig. 253,1. *T. conica, Carb., Brit.I; 1a-c, spiral, umbilical, and edge views, X51 (*2117).
Synonyms
Tetrataxis
Geographic Distribution
N.Am.-Eu.-Japan
Age Range
Beginning Stage in Treatise Usage:
Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Test free, trochospirally coiled, with all of numerous broad, low chambers visible on spiral side, and only rather few (commonly 4) of final whorl visible on umbilical side, umbilical cavity broad; wall calcareous, with 2 distinct layers, outer one microgranular and inner fibrous; aperture umbilical. [RlIditaxis is based on the type species Valvlllina mdis BRADY. His original specimens of this species in the British Museum (Natural History) are crushed internal casts, probably of Tetfataxis. The genera are here regarded as synonymous.]