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Gyroidina
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Alabaminidae
Formal Genus Name and Reference:
Gyroidina D'ORBIGNY, 1826, *1391, p. 278
Type Species:
G. orbicularis, SD CUSHMAN, 1927, *433, p. 190
Images
(Click to enlarge in a new window)
Fig. 614,5,6. *G. orbicularis, Rec., Eu.(Italy), 5a-c, opp. sides and edge view, 6 , edge view of dissected specimen showing foramen, all X74 (*2117).
Synonyms
Geographic Distribution
cosmop.
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:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochospiral, periphery rounded to subtruncate, spiral side flattened with all chambers visible, opposite side elevated and umbilicate with only chambers of final whorl visible, chambers rhomboidal in section, with angled umbilical shoulder, sutures radial to oblique, flush to depressed, wall calcareous, perforate, granular in structure, lamellar character unknown, primary aperture a low interiomarginal slit restricted to mid-portion of apertural face, bordered by narrow lip, small secondary apertures umbilical in position, against previous chamber wall with projecting umbilical flap extending backward over it, so that it is not evident except when test is viewed obliquely, or when final chamber is dissected so that secondary aperture may be seen.
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:
Gyroidina D'ORBIGNY, 1826, *1391, p. 278
Type Species:
G. orbicularis, SD CUSHMAN, 1927, *433, p. 190
Images
(Click to enlarge in a new window)
Fig. 614,5,6. *G. orbicularis, Rec., Eu.(Italy), 5a-c, opp. sides and edge view, 6 , edge view of dissected specimen showing foramen, all X74 (*2117).
Synonyms
Geographic Distribution
cosmop.
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:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochospiral, periphery rounded to subtruncate, spiral side flattened with all chambers visible, opposite side elevated and umbilicate with only chambers of final whorl visible, chambers rhomboidal in section, with angled umbilical shoulder, sutures radial to oblique, flush to depressed, wall calcareous, perforate, granular in structure, lamellar character unknown, primary aperture a low interiomarginal slit restricted to mid-portion of apertural face, bordered by narrow lip, small secondary apertures umbilical in position, against previous chamber wall with projecting umbilical flap extending backward over it, so that it is not evident except when test is viewed obliquely, or when final chamber is dissected so that secondary aperture may be seen.