Tannuella is a genus of helcionellid known from Lower Cambrian strata. It has a high, septate shell similar to that of hypseloconids such as Knightoconus . These genera were once considered ancestral cephalopods, but are more broadly assigned to the helconellids (or putatively the tergomyans); i.e. `Cambrian monoplacophora`. ...
Found on http://en.wikipedia.org/wiki/Tannuella
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