The tunicate seems to form a symbiotic relationship with the bryozoan "Bugula neritina". "Vittina" may be also recognized as a subgenus of the genus "Neritina". "Neritina pulligera" is the type species of the genus "Neritina". "Neritina granosa" lives in streams. A group of chemicals called bryostatins can be extracted from the marine bryozoan "Bugula neritina". Population density of "Neritina pulligera" is 2-7 snails per m in Caroline Islands. "Neritina pulligera" lives in fast-flowing freshwater streams and in rivers. "Neritina" is the type genus of the tribe Neritinini.