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.
బ్రయోజోన్లకు, సన్యాసి పీతలకు మధ్య ఎలాంటి సహజీవనం కనిపిస్తుంది?
non-obligate