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Orthokarstenia
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Buliminacea
Family:
Uvigerinidae
Formal Genus Name and Reference:
Orthokarstenia DIETRICH, 1935, *597, p. 80
Type Species:
Orthocerina ewaldi KARSTEN, 1856, *1025, p. 114, OD
Images
(Click to enlarge in a new window)
Fig. 446,8-10. *O. ewaldi (Karsten), Turon., S.Am.(Colom.), 8, ext., approx. X17; 9a,b, vert. and cross secs. showing internal semicylindrical siphon, approx. X30 (*1025); 10a,b, ext. and vert. sec. showing early triserial stage, approx. X20 (*597). -- Fig. 446,11,12. *O. clarki (Cushman & Campbell), U.Cret. (Campan.), USA(Calif.), 11, microspheric test, X21, 12a,b, megalospheric test, side, and apert. views, X21; 12c, basal view showing chamber arrangement, X41 (*757) .- -Fig. 446,13,14. O. whitei (Church), U.Cret.(Maastricht.), USA (Calif.); 13a,b, side and apert. views of megalospheric test, X21; 14a,b, dissected test showing
Synonyms
Siphogenerita
Geographic Distribution
N.Am.-S.Am.-Afr.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Test free, elongate, gradually enlarging from rounded base, early stage of microspheric form triserial, then short biserial stage, megalospheric form with proloculus followed by biserial stage, adult uniserial in both generations, adult chambers subcylindrical, somewhat inflated, lower margin commonly with re-entrants, resulting in appearance of lobulate sutures, sutures distinct, straight, depressed, wall calcareous, finely perforate, surface smooth or with ornamentation of longitudinal costae or striae, aperture terminal, elliptical to reniform, with short neck and distinct lip, internally provided with a spoutlike columellar process, semicylindrical spout arising from apertural lip and extending inward with concave side toward opening, those of successive chambers discontinuous, orientation of convex side changing from 120° to 180° in successive chambers, spout may terminate in small circular opening adjacent to concave side of true aperture but is not connected to it.
References
Dietrich, W. O., 1935, Zur Stratigraphie der Kolumbianischen Ostkordillere: Zentralbl. Mineral., Geol. \& Paläont., Jahrgang 1935, pt. B, p. 74-82, text-fig. 1-8.
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Buliminacea
Family:
Uvigerinidae
Formal Genus Name and Reference:
Orthokarstenia DIETRICH, 1935, *597, p. 80
Type Species:
Orthocerina ewaldi KARSTEN, 1856, *1025, p. 114, OD
Images
(Click to enlarge in a new window)
Fig. 446,8-10. *O. ewaldi (Karsten), Turon., S.Am.(Colom.), 8, ext., approx. X17; 9a,b, vert. and cross secs. showing internal semicylindrical siphon, approx. X30 (*1025); 10a,b, ext. and vert. sec. showing early triserial stage, approx. X20 (*597). -- Fig. 446,11,12. *O. clarki (Cushman & Campbell), U.Cret. (Campan.), USA(Calif.), 11, microspheric test, X21, 12a,b, megalospheric test, side, and apert. views, X21; 12c, basal view showing chamber arrangement, X41 (*757) .- -Fig. 446,13,14. O. whitei (Church), U.Cret.(Maastricht.), USA (Calif.); 13a,b, side and apert. views of megalospheric test, X21; 14a,b, dissected test showing
Synonyms
Siphogenerita
Geographic Distribution
N.Am.-S.Am.-Afr.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
U.Cret.(Maastricht.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Test free, elongate, gradually enlarging from rounded base, early stage of microspheric form triserial, then short biserial stage, megalospheric form with proloculus followed by biserial stage, adult uniserial in both generations, adult chambers subcylindrical, somewhat inflated, lower margin commonly with re-entrants, resulting in appearance of lobulate sutures, sutures distinct, straight, depressed, wall calcareous, finely perforate, surface smooth or with ornamentation of longitudinal costae or striae, aperture terminal, elliptical to reniform, with short neck and distinct lip, internally provided with a spoutlike columellar process, semicylindrical spout arising from apertural lip and extending inward with concave side toward opening, those of successive chambers discontinuous, orientation of convex side changing from 120° to 180° in successive chambers, spout may terminate in small circular opening adjacent to concave side of true aperture but is not connected to it.
References
Dietrich, W. O., 1935, Zur Stratigraphie der Kolumbianischen Ostkordillere: Zentralbl. Mineral., Geol. \& Paläont., Jahrgang 1935, pt. B, p. 74-82, text-fig. 1-8.