palolo worm

noun

1. a polychaete worm, Eunice viridis, that lives in burrows among the coral reefs of several South Pacific islands, producing sperm or eggs in posterior segments that are cast off periodically in enormous numbers.

noun

1. any of several polychaete worms of the family Eunicidae, esp Eunice viridis, of the S Pacific Ocean: reproductive segments are shed from the posterior end of the body when breeding