Background: Another non-obligate symbiosis is known from encrusting bryozoans and hermit crabs that live in a close relationship. The bryozoan colony (Acanthodesia commensale) develops a cirumrotatory growth and offers the crab (Pseudopagurus granulimanus) a helicospiral-tubular extension of its living chamber that initially was situated within a gastropod shell.
Question: What type of symbiosis seen between bryozoans and hermit crabs?
Answer:<extra_id_0>.
<extra_id_0> non-obligate<extra_id_1>