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Mortoniceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Mortoniceras MEEK, 1876, p. 448
Type Species:
Ammonites vespertinus MORTON, 1834, p. 40, OD
Images
(Click to enlarge in a new window)
Fig. 109a–d. *M. (M.) vespertinum (MORTON ), Upper Albian, Texas; a,b, holotype, × 0.25; c,d, × 0.5 (new).——FIG. 109e–g. M. (M.) inflatum (J. S OWERBY ); e, Upper Albian, England, × 0.7; f, Upper Albian, England, × 1 (Spath, 1923–1943); g, Upper Albian, France, ×1 (Orbigny, 1840–1842).——FIG. 109h. M. (M.) rostratum (J. S OWERBY ), Upper Albian, France; ×0.5 (Scholz, 1979).
Synonyms
Geographic Distribution
Europe, Africa, India, North America, South America, Madagascar
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
More or less evolute, with square, rectangular, or trapezoidal costal whorl section, ribs normally strong but may weaken or strengthen on body chamber, with prominent umbilical and normally with inner ventrolateral tubercles at least and, at some growth stage, 1 or 2 lateral and an outer ventrolateral tubercle also may occur, keel high or low
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Mortoniceras MEEK, 1876, p. 448
Type Species:
Ammonites vespertinus MORTON, 1834, p. 40, OD
Images
(Click to enlarge in a new window)
Fig. 109a–d. *M. (M.) vespertinum (MORTON ), Upper Albian, Texas; a,b, holotype, × 0.25; c,d, × 0.5 (new).——FIG. 109e–g. M. (M.) inflatum (J. S OWERBY ); e, Upper Albian, England, × 0.7; f, Upper Albian, England, × 1 (Spath, 1923–1943); g, Upper Albian, France, ×1 (Orbigny, 1840–1842).——FIG. 109h. M. (M.) rostratum (J. S OWERBY ), Upper Albian, France; ×0.5 (Scholz, 1979).
Synonyms
Geographic Distribution
Europe, Africa, India, North America, South America, Madagascar
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
More or less evolute, with square, rectangular, or trapezoidal costal whorl section, ribs normally strong but may weaken or strengthen on body chamber, with prominent umbilical and normally with inner ventrolateral tubercles at least and, at some growth stage, 1 or 2 lateral and an outer ventrolateral tubercle also may occur, keel high or low