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Trizonoceras
a79bbfa33d4004c9dc7f3134dbda315c
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Trizonoceras Girty, 1909
Source
Rank
genus
Names
1
species:4623885
Bull. U. S. geol. Surv. , No. 377, 70.
Classification
Dimorphoceratidae Hyatt, 1884
Trizonoceras Girty, 1909
