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Eccentrotheca is a genus of "tommotiid" known from Cambrian deposits. Its form rings that are stacked to produce a widening-upwards conical scleritome. Individual plates have been homologized with the valves of , and a relationship with the is also likely at a stem-group level. Its pointed end terminated in a stub that probably fastened it to a hard sea floor; its open end has been interpreted as a filter-feeding aperture.
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