Some encrusting bryozoan colonies with mineralized exoskeletons look very like small corals. It consists of a bryozoan facies and an oolitic facies and represents a subtidal shoal. Brachiopod, mollusk, trilobite, ostracod, bryozoan, graptolite and stromatoporoid fossils are especially common. Usually a fish and an oligochaete or polychaete worm, and in one case a bryozoan. Electra pilosa is a species of colonial bryozoan in the order Cheilostomata. Many have a two-host lifecycle, involving a fish and an annelid worm or a bryozoan. Individuals in bryozoan (ectoproct) colonies are called zooids, since they are not fully independent animals. The colonies of this bryozoan are also known to interrupt nutrient uptake by seaweed. "Tambja morosa" feeds on arborescent bryozoan colonies. One of the identifiable forms of bryozoan colonies, is frondose. In 1962 however, "Fenestella" was reinstated for the bryozoan genus. This order includes the majority of living bryozoan species. Two bryozoan species have recently been reported from the lake. A group of chemicals called bryostatins can be extracted from the marine bryozoan "Bugula neritina". It lives, feeds and lays its eggs primarily on the bryozoan "Zoobotryon verticillatum".