Sapphirina metallina is a species of copepods in the family Sapphirinidae. They are carnivores. Individuals can grow to 3.00 mm. They are sac spawners.
Definition: A pattern of movement used by some organisms, such as Copepods, living in the ocean and in lakes. The migration occurs when organisms move up to the epipelagic zone at night and return to the mesopelagic zone of the oceans or to the hypolimnion zone of lakes during the day
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)