Hookweeds divide in such a way that they remain hooked at the ends. Hooked ends do not produce more individuals and so chains grow in only one dimension, usually alternating between male and female individuals. New chains often form when animals bump apart or chew through existing chains, unhooking the ends. The heart, gills, and gamete blisters grow on the main bodies.
Written by Daniel Noe, ChampionOfTheGalaxy.com