Rotularia bognoriensis was a sedentary serpulid polychaete that secreted a calcareous tube and fed from the tube mouth with a crown of ciliated tentacles. As in living serpulids, those tentacles would have trapped suspended organic particles while also functioning in gas exchange.

Growth began as a tightly coiled disc and, in later growth, could continue as a freer tube projecting away from the coil. This distinctive construction records a permanently tube-dwelling animal attached to or resting against firm substrate on the London Clay sea floor.