Trepospira minima
Trepospira depressa

Left:       Trepospira minima
Right:     Trepospira depressa

General abundance:
Trepospira minima: Rare
Trepospira depressa: Common

References:

Trepospira minima
Desmoinesian Brachiopoda and Mollusca from Southwest Missouri
p. 150, Pl 20, figs. 14,16,18
Trepospira depressa
Desmoinesian Brachiopoda and Mollusca from Southwest Missouri
p. 149, Pl 20, figs. 15 & 17

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Phylum Mollusca
chitons cephalopods clams gastropods rostroconchs

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