Macrosetella gracilis is a species of copepods in the family Miraciidae. They are omnivore-herbivores. Individuals can grow to 1.80 mm. They are sac spawners.
Definition: The marine benthic biome (benthic meaning 'bottom') encompasses the seafloor and includes such areas as shores, littoral or intertidal areas, marine coral reefs, and the deep seabed.