Which marine arthropods are so numerous that they are thought to be the most abundant of all such organisms?

Question

Quizplus · Accepted Answer

Crustaceans, such as copepods and krill, are known to be incredibly abundant in marine environments, with estimates that they may account for up to 80% of all marine biomass. This makes them the most likely choice for the answer to this question. Millipedes, nematomorphs, apterygotes, and barnacles are all either terrestrial or mostly found in shallow marine environments, and are not known for their abundance in the same way that crustaceans are.

Which Marine Arthropods Are So Numerous That They Are Thought