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Metengonoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Hoplitaceae
Family:
Engonoceratidae
Formal Genus Name and Reference:
Metengonoceras HYATT, 1903, p. 179
Type Species:
M. inscriptum, SD ROMAN, 1938, p. 491
Images
(Click to enlarge in a new window)
Fig. 101, 1a. *M. inscriptum Hyatt, Upper Albian, Texas, X 1 (Hyatt, 1903).-Fig. 101, 1b, c. M. dumbli (Cragin), Cenomanian, Texas, X (Hyatt, 1903).
Synonyms
Epengonoceras
Geographic Distribution
France, western Africa, ?Madagascar, Texas
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (?Middle Albian, Upper Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Compressed, with flat to slightly concave sides, venter fairly broad on inner whorls but soon narrowing until acute on internal mold, though still with very narrow, flat or concave area on shell, and finally becoming rounded, with very weak ribs or smooth, ventrolateral tubercles rarely present
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Hoplitaceae
Family:
Engonoceratidae
Formal Genus Name and Reference:
Metengonoceras HYATT, 1903, p. 179
Type Species:
M. inscriptum, SD ROMAN, 1938, p. 491
Images
(Click to enlarge in a new window)
Fig. 101, 1a. *M. inscriptum Hyatt, Upper Albian, Texas, X 1 (Hyatt, 1903).-Fig. 101, 1b, c. M. dumbli (Cragin), Cenomanian, Texas, X (Hyatt, 1903).
Synonyms
Epengonoceras
Geographic Distribution
France, western Africa, ?Madagascar, Texas
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (?Middle Albian, Upper Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Upper Cretaceous (Upper Cenomanian)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Compressed, with flat to slightly concave sides, venter fairly broad on inner whorls but soon narrowing until acute on internal mold, though still with very narrow, flat or concave area on shell, and finally becoming rounded, with very weak ribs or smooth, ventrolateral tubercles rarely present