''Tannuella'' is a genus of helcionellids known from
Lower Cambrian
The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovici ...
strata.
It has a high, septate shell similar to that of ''
Knightoconus'' . These genera were once considered ancestral cephalopods,
but are more broadly assigned to the
helcionellids (or putatively the
tergomyans); i.e. "Cambrian monoplacophora".
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References
Helcionellidae
Prehistoric cephalopod genera
Cambrian molluscs
Paleozoic invertebrates of Oceania
Paleozoic animals of Asia
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