Tubularia is a genus of hydroids that appear to be furry pink tufts or balls at the end of long strings, thus causing them to be sometimes be called "pink-mouthed" or "pink-hearted" hydroids. Their average height is 40–60 mm and the diameter of the polyp and tentacles is 10mm. Tubularia indivisa and Ectopleura larynx can be difficult to distinguish and the two often grow together. In E. larynx the stems branch while in T. indivisa they are unbranched. Tubularia occurs either solitary or in colonies. The hydrants are large, brilliantly coloured and flower like. The colony is dioecious. The gonophores or medusae remain attached to the hypostome in clusters and are never set free. This animals represents structure of the ancestral coelenterate.
