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Discorbis
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Discorbbacea
Family:
Discorbidae
Subfamily:
Discorbinae
Formal Genus Name and Reference:
Discorbis LAMARCK, 1804, *1085a, p. 182
Type Species:
Discorbites vesicularis, OD (M)
Images
(Click to enlarge in a new window)
Fig. 451,1-3. "D. vesicularis, M.Eoc.(Lutet.), Fr.; 1a-c, opposite sides and edge view of well-preserved topotype, showing flange- like umbilical flaps with openings at each ex- tremity, X17; 2, umbilical side of smaller topotype, with less well-preserved flaps coalescing centrally and with a few central perforations, X17; 3, umbilical side of somewhat abraded topotype, umbilical flaps being destroyed and secondary apertures showing as sutural slits, X25 (*2117). -- Fig. 451,4. D. turbo (D'ORBIGNY), M.Eoc. (Lutet.), Fr.; 4a-c, opposite sides and edge view of specimen compared with and nearly identical to lectotype in Paris, X28 (*2117). --Fig. 451, 5. D. colliculus (BANDY), Eoc., USA (Ore.) ; 5a-c, opposite sides and edge view, X74 (*2117). -- Fig. 451,6,7. D. biaperturata (POKORNY), U.Eoc., Czech.; 6a-c, opposite sides and edge view of paratype, X85; 7, umbilical view of holotype, X85 (*1477)
Synonyms
Discorbites
Geographic Distribution
Eu.-N.Am.-Pac.-N.Z.- Australia-Atl.
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, plano-convex, flattened on umbilical side, periphery angled, all chambers visible on umbonate spiral side, only chambers of final whorl visible on umbilical side, with a flap extending from basal portion of each chamber toward umbilical region, opening extending along proximal side of each radial umbilical flap, connecting through cavity beneath flaps to interior of chambers themselves; primary aperture an interiomarginal, extraumbilical arch, secondary sutural openings at oppo,ite side of chamber flap remaining open as later chambers are formed; biflagellate gametes occur.
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Discorbbacea
Family:
Discorbidae
Subfamily:
Discorbinae
Formal Genus Name and Reference:
Discorbis LAMARCK, 1804, *1085a, p. 182
Type Species:
Discorbites vesicularis, OD (M)
Images
(Click to enlarge in a new window)
Fig. 451,1-3. "D. vesicularis, M.Eoc.(Lutet.), Fr.; 1a-c, opposite sides and edge view of well-preserved topotype, showing flange- like umbilical flaps with openings at each ex- tremity, X17; 2, umbilical side of smaller topotype, with less well-preserved flaps coalescing centrally and with a few central perforations, X17; 3, umbilical side of somewhat abraded topotype, umbilical flaps being destroyed and secondary apertures showing as sutural slits, X25 (*2117). -- Fig. 451,4. D. turbo (D'ORBIGNY), M.Eoc. (Lutet.), Fr.; 4a-c, opposite sides and edge view of specimen compared with and nearly identical to lectotype in Paris, X28 (*2117). --Fig. 451, 5. D. colliculus (BANDY), Eoc., USA (Ore.) ; 5a-c, opposite sides and edge view, X74 (*2117). -- Fig. 451,6,7. D. biaperturata (POKORNY), U.Eoc., Czech.; 6a-c, opposite sides and edge view of paratype, X85; 7, umbilical view of holotype, X85 (*1477)
Synonyms
Discorbites
Geographic Distribution
Eu.-N.Am.-Pac.-N.Z.- Australia-Atl.
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, plano-convex, flattened on umbilical side, periphery angled, all chambers visible on umbonate spiral side, only chambers of final whorl visible on umbilical side, with a flap extending from basal portion of each chamber toward umbilical region, opening extending along proximal side of each radial umbilical flap, connecting through cavity beneath flaps to interior of chambers themselves; primary aperture an interiomarginal, extraumbilical arch, secondary sutural openings at oppo,ite side of chamber flap remaining open as later chambers are formed; biflagellate gametes occur.