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Rotaliatina
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Alabaminidae
Formal Genus Name and Reference:
Rotaliatina CUSHMAN, 1925, *421, p. 4
Type Species:
R. mexicana, OD
Images
(Click to enlarge in a new window)
Fig. 614,7. *R. mexicana, U.Eoc., Mex., 7a-c, opp. sides and edge view, X65 (*2117)
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
Test free, high trochospiral, with rounded periphery, all chambers visible on elevated spiral side, only those of final whorl visible around small, deep umbilicus on opposite side, sutures radial, nearly straight, wall calcareous, finely perforate, surface smooth, lamellar character and microstructure not described, aperture an elongate interiomarginal slit, extending from near periphery to open umbilicus, with narrow bordering lip.
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Alabaminidae
Formal Genus Name and Reference:
Rotaliatina CUSHMAN, 1925, *421, p. 4
Type Species:
R. mexicana, OD
Images
(Click to enlarge in a new window)
Fig. 614,7. *R. mexicana, U.Eoc., Mex., 7a-c, opp. sides and edge view, X65 (*2117)
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
Test free, high trochospiral, with rounded periphery, all chambers visible on elevated spiral side, only those of final whorl visible around small, deep umbilicus on opposite side, sutures radial, nearly straight, wall calcareous, finely perforate, surface smooth, lamellar character and microstructure not described, aperture an elongate interiomarginal slit, extending from near periphery to open umbilicus, with narrow bordering lip.