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Orbitolites
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Miliolina
Superfamily:
Miliolacea
Family:
Soritidae
Subfamily:
Soritinae
Formal Genus Name and Reference:
Orbitolites LAMARCK, 1801, *1084, p. 376
Type Species:
O. complanata, SD DOUVILLÉ, 1902, *614, p. 296
Images
(Click to enlarge in a new window)
Fig. 387,1-4. *O. complanata, M. Eoc.(Lutet.), Fr., 1 a, b, opposite sides of microspheric topotype, with external wall preserved in center, abraded, showing chamberlets at margins, XS; 1c, edge view; 1d, portion of side showing opened nucleoconch, X 10; 2a,b, opposite sides of smaller megalospheric IOpotype, X S; 2c, central portion of 2b showing opened nucleoconch and ehamberlets where external wall is abraded,
X10 (1,2, *2117); 3,4, portions of axial and horiz. sees., X 50 (*1122).
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Paleoc.
Beginning International Stage:
Thanetian
Fraction Up In Beginning Stage:
0
Beginning Date:
59.24
Ending Stage in Treatise Usage:
Eoc.
Ending International Stage:
Priabonian
Fraction Up In Ending Stage:
100
Ending Date:
33.9
Description
Test discoidal, similar to Sorites, megalospheric form with large globular multilocular nucleoconch, surrounded by numerous chambers in annular series, chambers in successive alternate series, each chamber with pores connecting those of preceding and succeeding annulae only, but without stolons interconnecting chambers of single series, annulae poorly defined in later stages and chamberlets separated by thick oblique walls, apertures on periphery in rows perpendicular to median plane
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Miliolina
Superfamily:
Miliolacea
Family:
Soritidae
Subfamily:
Soritinae
Formal Genus Name and Reference:
Orbitolites LAMARCK, 1801, *1084, p. 376
Type Species:
O. complanata, SD DOUVILLÉ, 1902, *614, p. 296
Images
(Click to enlarge in a new window)
Fig. 387,1-4. *O. complanata, M. Eoc.(Lutet.), Fr., 1 a, b, opposite sides of microspheric topotype, with external wall preserved in center, abraded, showing chamberlets at margins, XS; 1c, edge view; 1d, portion of side showing opened nucleoconch, X 10; 2a,b, opposite sides of smaller megalospheric IOpotype, X S; 2c, central portion of 2b showing opened nucleoconch and ehamberlets where external wall is abraded,
X10 (1,2, *2117); 3,4, portions of axial and horiz. sees., X 50 (*1122).
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Paleoc.
Beginning International Stage:
Thanetian
Fraction Up In Beginning Stage:
0
Beginning Date:
59.24
Ending Stage in Treatise Usage:
Eoc.
Ending International Stage:
Priabonian
Fraction Up In Ending Stage:
100
Ending Date:
33.9
Description
Test discoidal, similar to Sorites, megalospheric form with large globular multilocular nucleoconch, surrounded by numerous chambers in annular series, chambers in successive alternate series, each chamber with pores connecting those of preceding and succeeding annulae only, but without stolons interconnecting chambers of single series, annulae poorly defined in later stages and chamberlets separated by thick oblique walls, apertures on periphery in rows perpendicular to median plane