 The fossil material of this species strongly suggests it is as large as the Cleveland Shale' "T. clarkii".The average combined length of the head and trunk shields for "T. termieri" is estimated to be 200 cm.When the first fossils of "T. termieri" were found by geologist Henri Termier, the specimens were originally placed within the genus "Gorgonichthys" - that is, after Termier was able to convince his colleagues that the bone scraps were of a placoderm, and not a dinosaur.