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Ammonia
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Rotaliacea
Family:
Rotaliidae
Subfamily:
Rotaliinae
Formal Genus Name and Reference:
Ammonia BRUNNICH, 1772. *248, p. 232
Type Species:
Nautilus beccarii LINNE, 1758, *1140, p. 710; SD FRIZZELL & KEEN, 1949, *752, p. 106
Images
(Click to enlarge in a new window)
Fig. 479,23. *A. beccarii (LINNE), Rec., Italy (2), S.Fr. (3); 2a-c, oppo- site sides and edge view of topotype, X27 (*437); 3a,b, axial and equat. secs., X50 (*358). -- Fig. 479,4. A . pacifica (ASANO), Rec., Japan; 4a-c, opposite sides and edge view of holotype, X33 (*48)
Synonyms
Hammonium
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, biconvex, low trochospiral coil of 3 or 4 volutions, sutures slightly curved, thickened, depressed on umbilical side, septa primarily double; wall calcareous, finely perforate, radial in structure; umbilical surface with irregular granules along suture and over umbilical region; umbilicus with open umbilical fissures and plug in young forms, which is broken up into numerous fused pillars and bosses in adult specimens, umbilical plugs extending inward to proloculus, no umbilical canal; aperture interio-marginal. [Rotalidium is regarded as a synonym of Ammonia, the "supplementary chamberlets" being the characteristic umbilical extensions, and the very rare type-species as a possible synonym of Rotalia japollica HADA, 1931, also described from Recent deposits along the Japanese coast.]
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Rotaliacea
Family:
Rotaliidae
Subfamily:
Rotaliinae
Formal Genus Name and Reference:
Ammonia BRUNNICH, 1772. *248, p. 232
Type Species:
Nautilus beccarii LINNE, 1758, *1140, p. 710; SD FRIZZELL & KEEN, 1949, *752, p. 106
Images
(Click to enlarge in a new window)
Fig. 479,23. *A. beccarii (LINNE), Rec., Italy (2), S.Fr. (3); 2a-c, oppo- site sides and edge view of topotype, X27 (*437); 3a,b, axial and equat. secs., X50 (*358). -- Fig. 479,4. A . pacifica (ASANO), Rec., Japan; 4a-c, opposite sides and edge view of holotype, X33 (*48)
Synonyms
Hammonium
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, biconvex, low trochospiral coil of 3 or 4 volutions, sutures slightly curved, thickened, depressed on umbilical side, septa primarily double; wall calcareous, finely perforate, radial in structure; umbilical surface with irregular granules along suture and over umbilical region; umbilicus with open umbilical fissures and plug in young forms, which is broken up into numerous fused pillars and bosses in adult specimens, umbilical plugs extending inward to proloculus, no umbilical canal; aperture interio-marginal. [Rotalidium is regarded as a synonym of Ammonia, the "supplementary chamberlets" being the characteristic umbilical extensions, and the very rare type-species as a possible synonym of Rotalia japollica HADA, 1931, also described from Recent deposits along the Japanese coast.]