Definition: An aquatic biome that comprises systems of open-ocean and unprotected coastal habitats, characterized by exposure to wave action, tidal fluctuation, and ocean currents as well as systems that largely resemble these. Water in the marine biome is generally within the salinity range of seawater: 30 to 38 ppt.
Definition: Length of the prosome of an arthropod. Prosome: anterior region of body, commonly limited behind by major articulation. Collective term for the combined cephalasome and metasome in copepods