Cauloramphus disjunctus is a species of small colonial bryozoan found encrusting rocks in shallow parts of the sea near Japan.

[2] The epidermis secretes a hard exoskeleton which protects and supports the trunks of the polyps and the whole colony resembles an encrusting lichen.

[2] Cauloramphus disjunctus is found in the seas off the north east coast of Honshu, Japan, from Kushiro southwards to Sendai.

There is a quarry at Kuromatsunai on Hokkaido which is a rich source of well-preserved bryozoan fossils, including this species, dating back to the Pleistocene.

Since then, the spines have gradually become more numerous and angled inwards and now present an effective grid through which most predators cannot penetrate but which still allow the polyps to feed.