Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Parancyloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Ancylocerataceae
Family:
Ancyloceratidae
Formal Genus Name and Reference:
Parancyloceras SPATH, 1924a, p. 79
Type Species:
Crioceras bidentatum KOENEN, 1902, p. 329, OD
Images
(Click to enlarge in a new window)
Fig. 164, 1a, b. P. bidentatum (Koenen), Germany, X 1 (Koenen, 1902)
Synonyms
Geographic Distribution
England, Germany
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Beginning International Stage:
Barremian
Fraction Up In Beginning Stage:
50
Beginning Date:
123.95
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Coiled either in plane spiral (with whorls just touching or not in contact) or straightening (possibly then hooked) after a few coiled whorls, ribs uniform, distant, sharp, equal, steep, radial or oblique, with more or less distinct outer and (in some species) also inner ventrolateral tubercles, ribs may be doubled between outer tubercles
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Ancylocerataceae
Family:
Ancyloceratidae
Formal Genus Name and Reference:
Parancyloceras SPATH, 1924a, p. 79
Type Species:
Crioceras bidentatum KOENEN, 1902, p. 329, OD
Images
(Click to enlarge in a new window)
Fig. 164, 1a, b. P. bidentatum (Koenen), Germany, X 1 (Koenen, 1902)
Synonyms
Geographic Distribution
England, Germany
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Beginning International Stage:
Barremian
Fraction Up In Beginning Stage:
50
Beginning Date:
123.95
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Coiled either in plane spiral (with whorls just touching or not in contact) or straightening (possibly then hooked) after a few coiled whorls, ribs uniform, distant, sharp, equal, steep, radial or oblique, with more or less distinct outer and (in some species) also inner ventrolateral tubercles, ribs may be doubled between outer tubercles