Kelp
Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.
Coelopa frigida
Coelopa frigida is a species of seaweed fly or kelp fly. It is the most widely distributed species of seaweed fly. It can be found on most shorelines in the temperate Northern Hemisphere. Other species of seaweed flies include "Coelopa pilipes".