Tymbochoos is an extinct genus of encrusting tentaculitoid tubeworms. Tymbochoos has a laminar tube structure and pseudopuncta similar to those of the tentaculitoids. It has previously been interpreted as a Palaeozoic polychaete. The world's oldest build-ups with tube-supported frameworks belong to Tymbochoos sinclairi.Okulitch, V.J. 1937. Notes on Fletcheria incerta (Billings) and Fletcheria sinclairi n. sp. Transactions of the Royal Canadian Institute 21, 313–316. They occur in the Ordovician limestones of the Ottawa Valley.
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