11. Subsequent zooid replication can lead to coalescence and circulatory fusion of the subcolonies. 12. All the zooids of a colony are asexually produced from one parent zooid. 13. All the zooids of a colony are asexually produced from one parent zooid . 14. The body of each zooid is divided into a thorax and an abdomen. 15. The primary type is the sessile trophont stalked zooid . 16. Several species of amphipod live symbiotically inside the zooids . 17. In some species, further specialised zooids are formed. 18. Different zooids in the colony have different specialised functions. 19. Other zooids link to the phorozooids, which then detach themselves from the nurse. 20. When this sperm is drawn into another individual zooid , internal fertilisation can occur.
