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Nippononaia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Unionidae
Subfamily:
Unioninae
Formal Genus Name and Reference:
Nippononaia SUZUKI, 1941
Type Species:
Unio ryosekiana, OD
Images
(Click to enlarge in a new window)
Fig. D27,3. *N. ryosekiana (Suzuki), LV ext., X1 (after 896).
Synonyms
Geographic Distribution
Japan
Age Range
Beginning Stage in Treatise Usage:
L.Cret.
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Subelliptical, medium-sized, with many acute V-shaped ridges centering on line from beak to middle of ventral margin which is finely crenulate
References
Suzuki, Koiti, 1941, A new naiad Unio (Nipponaias) ryosekiana n. subgen., and n. sp., from the Lower Cretaceous of Japan: Geol. Soc. Japan, Jour., v. 48, p. 410-413, text fig. 1-3.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Unionoida (Freshwater mussels and relatives)
Superfamily:
Unionacea (freshwater mussels)
Family:
Unionidae
Subfamily:
Unioninae
Formal Genus Name and Reference:
Nippononaia SUZUKI, 1941
Type Species:
Unio ryosekiana, OD
Images
(Click to enlarge in a new window)
Fig. D27,3. *N. ryosekiana (Suzuki), LV ext., X1 (after 896).
Synonyms
Geographic Distribution
Japan
Age Range
Beginning Stage in Treatise Usage:
L.Cret.
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
0
Beginning Date:
143.1
Ending Stage in Treatise Usage:
L.Cret.
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Subelliptical, medium-sized, with many acute V-shaped ridges centering on line from beak to middle of ventral margin which is finely crenulate
References
Suzuki, Koiti, 1941, A new naiad Unio (Nipponaias) ryosekiana n. subgen., and n. sp., from the Lower Cretaceous of Japan: Geol. Soc. Japan, Jour., v. 48, p. 410-413, text fig. 1-3.