Kalaide
this was a species of small mollusks native to the waters of Harvest Bay, on the planet Cols. They measure no larger than two centimeters across, including their shelled bodies and flagellum. They have a lifespan of just a few months, but reproduce proficiently in stable environments. The kalaides float along and consume a wide variety of bacteria and small algae, in effect cleaning the waters of the planet and making them inhabitable to other species. However, when climatic or environmental changes affect the waterways, birthrates of kalaides drop dramatically, thereby affecting other populations. The government of Cols has placed severe restrictions on the corporations of the planet, forcing them to minimize their chemical wastes in order to preserve the kalaide populations.