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Rotalia
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Rotaliacea
Family:
Rotaliidae
Subfamily:
Rotaliinae
Formal Genus Name and Reference:
Rotalia LAMARCK, 1804, *1085a, p. 183
Type Species:
Rotalites trochidiformis Lamarck, 1804, *1085a, SD Galloway & WISSLER, 1927, *766, p. 59
Images
(Click to enlarge in a new window)
Fig. 479, 1; 480,1-3. *R. trochidiformis LAMARCK, M.Eoc. (Lutet.), Eu.(Fr.); 479,la-c, opposite sides and edge view, X31 (*2117); -- Fig. 480,1, lectotype, X20; 480,2a, axial sec. showing radially built lamellar walls and umbilical pillars, which are not con- tinuous from one whorl to next, X25; 480,2b, portion of preceding sec., X85; 480,3, diagram. sec. showing character of umbilical plugs (*561).
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Senon.)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochospiral, lenticular to plano-convex, 1-4 mm diam., all whorls visible from spiral side, spire multilocular and single, direction of coiling random, chambers simple, 8 to 17 to whorl, septa primarily double, formed by upward bending of chamber floor, wall calcareous, coarsely perforate, of radially fibrous calcite, spiral side smooth, umbilical side with plug split by anastomosing fissures into numerous tubercles and pillars that crowd central portion of test, pillars not continuous from one whorl to next, as in Dictyoconoides and Lockhartia, but limited to each whorl, although they may fuse laterally to close fissures and form solid central mass, with umbilical canal beneath cortical chamber layer receiving tributary canals from umbilical slitlike apertures at inner side of chambers; in some species fissures or canals also present in septa. [The double septa have long been noted in Rotalia (CARPENTER, PARKER & JONES, 1862, *281, p. 214; ANDREAE, 1884, *19, p. 215) although only recently has use been made of this character in classification (SMOUT, "1803, p. 9)].
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:
Rotalia LAMARCK, 1804, *1085a, p. 183
Type Species:
Rotalites trochidiformis Lamarck, 1804, *1085a, SD Galloway & WISSLER, 1927, *766, p. 59
Images
(Click to enlarge in a new window)
Fig. 479, 1; 480,1-3. *R. trochidiformis LAMARCK, M.Eoc. (Lutet.), Eu.(Fr.); 479,la-c, opposite sides and edge view, X31 (*2117); -- Fig. 480,1, lectotype, X20; 480,2a, axial sec. showing radially built lamellar walls and umbilical pillars, which are not con- tinuous from one whorl to next, X25; 480,2b, portion of preceding sec., X85; 480,3, diagram. sec. showing character of umbilical plugs (*561).
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Senon.)
Beginning International Stage:
Coniacian
Fraction Up In Beginning Stage:
0
Beginning Date:
89.39
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochospiral, lenticular to plano-convex, 1-4 mm diam., all whorls visible from spiral side, spire multilocular and single, direction of coiling random, chambers simple, 8 to 17 to whorl, septa primarily double, formed by upward bending of chamber floor, wall calcareous, coarsely perforate, of radially fibrous calcite, spiral side smooth, umbilical side with plug split by anastomosing fissures into numerous tubercles and pillars that crowd central portion of test, pillars not continuous from one whorl to next, as in Dictyoconoides and Lockhartia, but limited to each whorl, although they may fuse laterally to close fissures and form solid central mass, with umbilical canal beneath cortical chamber layer receiving tributary canals from umbilical slitlike apertures at inner side of chambers; in some species fissures or canals also present in septa. [The double septa have long been noted in Rotalia (CARPENTER, PARKER & JONES, 1862, *281, p. 214; ANDREAE, 1884, *19, p. 215) although only recently has use been made of this character in classification (SMOUT, "1803, p. 9)].