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Cockroach type bug near seashore

Cockroach type bug near seashore
Garden City, South Carolina, USA
March 16, 2015
Found on the beach at Garden City Pier.

Thinking [i]Cybister[/i] for
Thinking Cybister for this one.

Moved from ID Request.

Cybister or Dytiscus
need better pic to tell genus

Body shape too pointed for Dytiscus?
Just by going on images of the two genera on the site. Wish I knew more about the family, encountered very few...

Diving beetle
It is a diving beetle in the family Dytiscidae. Maybe Cybister?

diving beetle
My sister took this photo on the beach in Garden City, SC. She says it was 1-1.5 inches long and it was trying to get back to the ocean. Do these diving beetles live in salt water?

The large majority of diving beetles
are only found in freshwater. You may rarely see certain types in saltwater lagoons or in saltier parts of rivers, but never in the ocean.

Aquatic insects are attracted to reflective surfaces (which they think is water). They land on car windows and metal surfaces all the time. It probably just saw the reflection of sea and headed for it, but it wouldn't survive in there.

I guess in this rare instance you might have seen one in the ocean for a few seconds! But they aren't meant to be in there.

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