0 a type of sea creature that has a simple body with tentacles and a single opening at the centre, such as a jellyfish or a sea anemone -- 腔肠动物（一种海洋动物，形体简单，有触手，中部为一腔口，如水母、海葵）
At present, we have no information on the nature of the effector cells involved in graft rejection in sponges and coelenterates.
Symbiodinium, together with the nematocysts, are presumed to be derived from coelenterate prey.
Both groups unknowingly discovered that the same compound was used in both luminescent systems, however the name of the molecule was given after the coelenterate.
