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Galaticeras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Phyllocerataceae
Family:
Juraphyllitidae
Formal Genus Name and Reference:
Galaticeras SPATH, 1938
Type Species:
Amphiceras harpoceroides GEMMELLARO, 1884
Images
(Click to enlarge in a new window)
Fig. 221,4. *G. harpoceroides (Gemm.), Italy, 4a,b, X0.5 (627 *)
Synonyms
Amphiceras
Geographic Distribution
Pliensb., Eu.-?Cauc.
Age Range
Beginning Stage in Treatise Usage:
Pliensb.
Beginning International Stage:
Pliensbachian
Fraction Up In Beginning Stage:
0
Beginning Date:
192.9
Ending Stage in Treatise Usage:
Pliensb.
Ending International Stage:
Pliensbachian
Fraction Up In Ending Stage:
100
Ending Date:
184.2
Description
Shell more evolute than in any other Jurassic Phylloceratina, compressed, discoidal, with rounded-quadrate, slowly enlarging whorls on which feeble juraphyllitid ribbing remains, but sutures have lost their phylloid character as in some Cretaceous forms
References
Spath, L. F., 1938, A catalogue of the ammonites of the Liassic family Liparoceratidae: Brit. Mus. Nat. Hist. (London), 191 p., 26 pl.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Phyllocerataceae
Family:
Juraphyllitidae
Formal Genus Name and Reference:
Galaticeras SPATH, 1938
Type Species:
Amphiceras harpoceroides GEMMELLARO, 1884
Images
(Click to enlarge in a new window)
Fig. 221,4. *G. harpoceroides (Gemm.), Italy, 4a,b, X0.5 (627 *)
Synonyms
Amphiceras
Geographic Distribution
Pliensb., Eu.-?Cauc.
Age Range
Beginning Stage in Treatise Usage:
Pliensb.
Beginning International Stage:
Pliensbachian
Fraction Up In Beginning Stage:
0
Beginning Date:
192.9
Ending Stage in Treatise Usage:
Pliensb.
Ending International Stage:
Pliensbachian
Fraction Up In Ending Stage:
100
Ending Date:
184.2
Description
Shell more evolute than in any other Jurassic Phylloceratina, compressed, discoidal, with rounded-quadrate, slowly enlarging whorls on which feeble juraphyllitid ribbing remains, but sutures have lost their phylloid character as in some Cretaceous forms
References
Spath, L. F., 1938, A catalogue of the ammonites of the Liassic family Liparoceratidae: Brit. Mus. Nat. Hist. (London), 191 p., 26 pl.