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Trigonioides
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigonioididae
Formal Genus Name and Reference:
Trigonioides Kobayashi & SUZUKI, 1936, p. 248
Type Species:
T. kodairai, OD
Images
(Click to enlarge in a new window)
Fig. D76,2a. *T. kodairai, L.Cret., S.Korea; LV ext., X1.5 (479). --Fig. D76,2b,e. T. matsumotoi KOBAYASHI & SUZUKI, U. Cret.(Turon.), Japan; 2b,e, LV int., RV int., Xl (Ota, 1959). --Fig. D76,2d. T. kobayashi HOFFET, U.Cret.(Senon.), Laos; L V int., X l (Ota, 1959)
Synonyms
Hoffetrigonia
Geographic Distribution
Japan-Laos- Korea-Manchuria
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:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Shell form as defined for family, flank ornamented with steeply inclined ribs which converge ventrally so as to form acute V's on median part of shell, ribs of posterior series being generally thicker; both extremities of shell or only posterior one bearing less steeply sloping, oblique ribs; ventral margin crenulated internally; hinge plate well developed, widening anteriorly; hinge teeth, all of which bear regular transverse crenu- lations, consisting of narrow posterior lateral in right valve, well separated from beak and re- ceived in recess between 2 teeth projecting from hinge plate in left valve, and of anterior series of radially disposed teeth, 3 or 4 in each valve, extending from below beak to anterior end of hinge plate, subumbonal ones relatively short, more anterior ones broad and elongated; adductor scars small, subequal, dorsally placed, anterior one with small accessory scar just behind it. [Fresh and brackish waters.]
References
——, \& Suzuki, Koiti, 1936, Non-marine shells of the NaktongWakino Series: Japan. Geol. Geogr., Jour., v. 13, p. 243-259, pl. 27-29.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Trigonioididae
Formal Genus Name and Reference:
Trigonioides Kobayashi & SUZUKI, 1936, p. 248
Type Species:
T. kodairai, OD
Images
(Click to enlarge in a new window)
Fig. D76,2a. *T. kodairai, L.Cret., S.Korea; LV ext., X1.5 (479). --Fig. D76,2b,e. T. matsumotoi KOBAYASHI & SUZUKI, U. Cret.(Turon.), Japan; 2b,e, LV int., RV int., Xl (Ota, 1959). --Fig. D76,2d. T. kobayashi HOFFET, U.Cret.(Senon.), Laos; L V int., X l (Ota, 1959)
Synonyms
Hoffetrigonia
Geographic Distribution
Japan-Laos- Korea-Manchuria
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:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Shell form as defined for family, flank ornamented with steeply inclined ribs which converge ventrally so as to form acute V's on median part of shell, ribs of posterior series being generally thicker; both extremities of shell or only posterior one bearing less steeply sloping, oblique ribs; ventral margin crenulated internally; hinge plate well developed, widening anteriorly; hinge teeth, all of which bear regular transverse crenu- lations, consisting of narrow posterior lateral in right valve, well separated from beak and re- ceived in recess between 2 teeth projecting from hinge plate in left valve, and of anterior series of radially disposed teeth, 3 or 4 in each valve, extending from below beak to anterior end of hinge plate, subumbonal ones relatively short, more anterior ones broad and elongated; adductor scars small, subequal, dorsally placed, anterior one with small accessory scar just behind it. [Fresh and brackish waters.]
References
——, \& Suzuki, Koiti, 1936, Non-marine shells of the NaktongWakino Series: Japan. Geol. Geogr., Jour., v. 13, p. 243-259, pl. 27-29.