How do terrestrial food webs differ from aquatic food webs?

In aquatic food webs you see many more quarternary consumers. For example, a small fish eats kelp, a primary consumer. A jellyfish eats him, a secondary consumer. A sea turtle eats him, a tertiary consumer. A shark eats him a quaternary consumer. A human has a bowl of shark fin soup, but I don't believe there is a word for...quintery consumer (made up). The primary producers of the ocean are the plankton and algae, whereas on land primary producers are plants. Krill and other similar organisms, quite small and look sorta like shrimp, make up the backbone of the ocean ecosystem, much like angiosperms or other plants that have edible parts to them.