Avicularium (defensive polymorph) wedged between the spines of a fossil colony of Cauloramphus disjunctus. © P Taylor
Although Cauloramphus disjunctus has never been observed alive, it undoubtedly feeds on tiny plankton captured by the feeding zooids of the colony, as in other bryozoan species.
Colonies compete with other bryozoans for living space. When successful they overgrow and smother their competitors, but when unsuccessful they themselves are overgrown, resulting in the death of some of the zooids in the colony.