gonadid
A gonadid is a small, immature reproductive structure found in certain marine invertebrates, particularly within the phylum Cnidaria, which includes organisms like corals, sea anemones, and hydroids. Gonadids develop within the coelenteron (the central cavity of the organism) and eventually mature into functional gametes—either eggs or sperm—depending on the species. They are a key component of the reproductive cycle in many sessile (stationary) marine organisms, enabling asexual or sexual reproduction.
In corals, for example, gonadids form within the polyps and contribute to the production of planulae (larvae)
Gonadids are also found in other marine groups, including certain bryozoans and tunicates, though their structure