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Sphaeroidinella
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Globigerinacea
Family:
Globigerinidae
Subfamily:
Sphaeroidinellinae
Formal Genus Name and Reference:
Sphaeroidinella CUSHMAN, 1927, *431, p. 90
Type Species:
Sphaeroidina dehiscens Parker & JONES, 1865, *1418, p. 369, OD
Images
(Click to enlarge in a new window)
Fig. 539, 3. *S. triloculinoides (PLUMMER), Midway., USA
(Tex.); 3a-c, opposite sides and edge view of topotype, X73 (*1174)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Mio.
Beginning International Stage:
Tortonian
Fraction Up In Beginning Stage:
0
Beginning Date:
11.63
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Early portion trochospiral, with 2 or 3 much-embracing chambers of final whorl enveloping early whorl, chambers with marginal flanges extending out toward those of opposing chambers and partially obscuring arched apertures; wall calcareous, perforate, pores extremely large and closely arranged in early stage, giving an almost lattice-like appearance, area between pores raised and cancellated; in later chambers somewhat irregularly fimbriate or scalloped flange of clear shell material, relatively poreless, is formed around chamber base, tending to coalesce laterally and become much produced, exterior surface of final chambers becoming smooth and glassy due to external secondary deposit; primary aperture in young interiomarginal and umbilical, as in Globigerina, but later covered by embracing final chamber; one or more sutural secondary apertures may occur on opposite sides of final chamber, and may be partially obscured by overhanging chamber flanges which parallel sutures, or chambers may be distinctly separated, with wide open area between flanges of opposing chambers, with small arched bullae crossing the sutural slit and partially covering apertural regions, walls of bullae smoothly finished and with finer pores than in chambers, although similarly spaced.
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Globigerinacea
Family:
Globigerinidae
Subfamily:
Sphaeroidinellinae
Formal Genus Name and Reference:
Sphaeroidinella CUSHMAN, 1927, *431, p. 90
Type Species:
Sphaeroidina dehiscens Parker & JONES, 1865, *1418, p. 369, OD
Images
(Click to enlarge in a new window)
Fig. 539, 3. *S. triloculinoides (PLUMMER), Midway., USA
(Tex.); 3a-c, opposite sides and edge view of topotype, X73 (*1174)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Mio.
Beginning International Stage:
Tortonian
Fraction Up In Beginning Stage:
0
Beginning Date:
11.63
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Early portion trochospiral, with 2 or 3 much-embracing chambers of final whorl enveloping early whorl, chambers with marginal flanges extending out toward those of opposing chambers and partially obscuring arched apertures; wall calcareous, perforate, pores extremely large and closely arranged in early stage, giving an almost lattice-like appearance, area between pores raised and cancellated; in later chambers somewhat irregularly fimbriate or scalloped flange of clear shell material, relatively poreless, is formed around chamber base, tending to coalesce laterally and become much produced, exterior surface of final chambers becoming smooth and glassy due to external secondary deposit; primary aperture in young interiomarginal and umbilical, as in Globigerina, but later covered by embracing final chamber; one or more sutural secondary apertures may occur on opposite sides of final chamber, and may be partially obscured by overhanging chamber flanges which parallel sutures, or chambers may be distinctly separated, with wide open area between flanges of opposing chambers, with small arched bullae crossing the sutural slit and partially covering apertural regions, walls of bullae smoothly finished and with finer pores than in chambers, although similarly spaced.