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Pleydellia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Hildocerataceae
Family:
Hildoceratidae
Subfamily:
Grammoceratinae
Formal Genus Name and Reference:
Pleydellia BUCKMAN, 1899
Type Species:
P. comata
Images
(Click to enlarge in a new window)
Fig. 294,1. *P. comata, Eng.; 1a-d, Xl (60*)
Synonyms
Cotteswoldia, Gotteswaldia, Canavaria, Canavarina, Walkeria, Walkericeras
Geographic Distribution
Eu.-N.Afr.-Anatolia-Persia-?Arg.
Age Range
Beginning Stage in Treatise Usage:
Toarc.(jurense z.)
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
50
Beginning Date:
179.45
Ending Stage in Treatise Usage:
L.Baj.(opalinum z.)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
45
Ending Date:
169.67
Description
Involute to evolute, mod- erately compressed, tending to oxycone form; um- bilical margin abrupt or moderately rounded; ribbing tends to fade on either inner or outer half of whorl side.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ceratitida
Suborder:
Ammonitina
Superfamily:
Hildocerataceae
Family:
Hildoceratidae
Subfamily:
Grammoceratinae
Formal Genus Name and Reference:
Pleydellia BUCKMAN, 1899
Type Species:
P. comata
Images
(Click to enlarge in a new window)
Fig. 294,1. *P. comata, Eng.; 1a-d, Xl (60*)
Synonyms
Cotteswoldia, Gotteswaldia, Canavaria, Canavarina, Walkeria, Walkericeras
Geographic Distribution
Eu.-N.Afr.-Anatolia-Persia-?Arg.
Age Range
Beginning Stage in Treatise Usage:
Toarc.(jurense z.)
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
50
Beginning Date:
179.45
Ending Stage in Treatise Usage:
L.Baj.(opalinum z.)
Ending International Stage:
Bajocian
Fraction Up In Ending Stage:
45
Ending Date:
169.67
Description
Involute to evolute, mod- erately compressed, tending to oxycone form; um- bilical margin abrupt or moderately rounded; ribbing tends to fade on either inner or outer half of whorl side.