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Sphaeroidina
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Buliminacea
Family:
Sphaeroidinidae
Formal Genus Name and Reference:
Sphaeroidina n'ORBIGNY, 1826, *1391, p. 267
Type Species:
S. bulloides; OD (M)
Images
(Click to enlarge in a new window)
Fig. 432, 1-3. *S. bulloides, Rec., Italy (1), Mio.(Torton.), Czech.(Morav.) (2,3); 1a,b, opposite sides of topot"pe, X73 (°530); 2a,b, 3a,b, diagram. figures showing chamber arrangement, opposite sides seen through sides of final chamber with preceding whorl indicated by dotted lines, X44 (°1983)
Synonyms
Geographic Distribution
Italy
Age Range
Beginning Stage in Treatise Usage:
U.Eoe.
Beginning International Stage:
Priabonian
Fraction Up In Beginning Stage:
0
Beginning Date:
37.71
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test subglobular, coiling variable, depending on fluctuation in position of aperture; chambers hemispherical, few, number depending on changes of apertural position and relative size and placement of chambers, each placed cenrrally about previous aperture, scrongly embracing, median apertural planes of later chambers diverging from those of eulier ones alternating to left and right, or constantly to one side, or irregularly to right and left by angle up to 180°, commonly 90°
, in latter case resulting in relatively regular spiral; wall of calcite, very finely perforate, radial in structure, surface smooth or faintly roughened near aperture, which is crescentic slit near suture and may occur above junction of 3 chambers, bordered by lip, also may have simple or bifid tooth. [Placed in the Chilostomellidae by (1948, °486, p. 321), it was transferred to the Cassidulinidae by VASICEK (1956, °1983, p. 160). However, as both the Chilostomellidae and Cassidulinidae are characterized by a perforate granular wall structure, the radially built Sphaeroidininae have been elevated to a separate family by us (°1177, p. 300) and placed in the superfamily Buliminacea.]
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Buliminacea
Family:
Sphaeroidinidae
Formal Genus Name and Reference:
Sphaeroidina n'ORBIGNY, 1826, *1391, p. 267
Type Species:
S. bulloides; OD (M)
Images
(Click to enlarge in a new window)
Fig. 432, 1-3. *S. bulloides, Rec., Italy (1), Mio.(Torton.), Czech.(Morav.) (2,3); 1a,b, opposite sides of topot"pe, X73 (°530); 2a,b, 3a,b, diagram. figures showing chamber arrangement, opposite sides seen through sides of final chamber with preceding whorl indicated by dotted lines, X44 (°1983)
Synonyms
Geographic Distribution
Italy
Age Range
Beginning Stage in Treatise Usage:
U.Eoe.
Beginning International Stage:
Priabonian
Fraction Up In Beginning Stage:
0
Beginning Date:
37.71
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test subglobular, coiling variable, depending on fluctuation in position of aperture; chambers hemispherical, few, number depending on changes of apertural position and relative size and placement of chambers, each placed cenrrally about previous aperture, scrongly embracing, median apertural planes of later chambers diverging from those of eulier ones alternating to left and right, or constantly to one side, or irregularly to right and left by angle up to 180°, commonly 90°
, in latter case resulting in relatively regular spiral; wall of calcite, very finely perforate, radial in structure, surface smooth or faintly roughened near aperture, which is crescentic slit near suture and may occur above junction of 3 chambers, bordered by lip, also may have simple or bifid tooth. [Placed in the Chilostomellidae by (1948, °486, p. 321), it was transferred to the Cassidulinidae by VASICEK (1956, °1983, p. 160). However, as both the Chilostomellidae and Cassidulinidae are characterized by a perforate granular wall structure, the radially built Sphaeroidininae have been elevated to a separate family by us (°1177, p. 300) and placed in the superfamily Buliminacea.]