Eccentrotheca

{{Short description|Extinct genus of marine organisms}}

{{Automatic taxobox

| fossil_range = {{fossil range|Early Cambrian}}

| image = Eccentrotheca.jpg

| image_caption = Life restoration

| taxon = Eccentrotheca

| authority = Landing, Nowlan & Fletcher, 1980

}}

Eccentrotheca is a genus of "tommotiid" known from Cambrian deposits. Its sclerites form rings that are stacked to produce a widening-upwards conical scleritome.{{Cite journal | last1 = Skovsted | first1 = C. B. | last2 = Brock | first2 = G. A. | last3 = Topper | first3 = T. P. | last4 = Paterson | first4 = J. R. | last5 = Holmer | first5 = L. E. | title = Scleritome construction, biofacies, biostratigraphy and systematics of the tommotiid Eccentrotheca helenia sp. nov. from the Early Cambrian of South Australia | journal = Palaeontology | volume = 54 | issue = 2 | pages = 253–286 | year = 2011 | doi = 10.1111/j.1475-4983.2010.01031.x | bibcode = 2011Palgy..54..253S | s2cid = 128946130 | doi-access = }} Individual plates have been homologized with the valves of brachiopods, and a relationship with the phoronids 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.