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Harpoceratoides
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hildoceratidae
Formal Genus Name and Reference:
Harpoceratoides BUCKMAN, 1909
Type Species:
Am. alternatus Simpson in BUCK., 1909
Images
(Click to enlarge in a new window)
Fig. 289, 4. *H. (H.) alternatus (Simp.), Eng.
Synonyms
Glyptarpites
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Toarc.
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
0
Beginning Date:
184.2
Ending Stage in Treatise Usage:
L.Toarc.
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
50
Ending Date:
179.45
Description
Differs from Harpoceras in being more evolute and having the ribbing more fasciculate, more clearly differentiated into primaries and secondaries. Subgen. of Harpoceras.
References
Buckman, S. S., 1909-30, Type ammonites: (London), v. 1-7, text and 790 pl .
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hildoceratidae
Formal Genus Name and Reference:
Harpoceratoides BUCKMAN, 1909
Type Species:
Am. alternatus Simpson in BUCK., 1909
Images
(Click to enlarge in a new window)
Fig. 289, 4. *H. (H.) alternatus (Simp.), Eng.
Synonyms
Glyptarpites
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Toarc.
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
0
Beginning Date:
184.2
Ending Stage in Treatise Usage:
L.Toarc.
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
50
Ending Date:
179.45
Description
Differs from Harpoceras in being more evolute and having the ribbing more fasciculate, more clearly differentiated into primaries and secondaries. Subgen. of Harpoceras.
References
Buckman, S. S., 1909-30, Type ammonites: (London), v. 1-7, text and 790 pl .