In general, seaweed flies are dark-colored, small or medium-sized flies with hairs or bristles.
Darker color makes the adults more distinguishable from other species, but larvae are less easily identified.
Adults have small eyes and short antennae and legs, and their bodies tend to be more flattened than other species.

Environment, genetic factors, and nutrition contribute to variable measurements such as wing size.
In order to adapt to wet seaside environments, C. pilipes larvae have hair on their posterior parts and spines on their ventral surfaces, as seen in many species that dwell in damp seaweed.

Coelopa pilipes are phylogenetically distant from other species in the Coelopa genus and thus display certain behaviors that differ from other Coelopa flies.
In general, seaweed flies are dark-colored, small or medium-sized flies with hairs or bristles. Darker color makes the adults more distinguishable from other species, but larvae are less easily identified. Adults have small eyes and short antennae and legs, and their bodies tend to be more flattened than other species. 
Environment, genetic factors, and nutrition contribute to variable measurements such as wing size. In order to adapt to wet seaside environments, C. pilipes larvae have hair on their posterior parts and spines on their ventral surfaces, as seen in many species that dwell in damp seaweed.
Coelopa pilipes are phylogenetically distant from other species in the Coelopa genus and thus display certain behaviors that differ from other Coelopa flies.
Coelopa pilipes