There are over 220 species of dobsonfly so you'll have to be more specific in telling us what you want to know.
4 inches long
No, we just caught one in my front yard. It is not extinct.
dobsonfly live near bodies of water for that most part, they spend most of their lives in the larval states as water creatures, when they grow up they live for only seven days or so and primarily live near the body of water from which they were born.
If it's the same thing we called a "helgermite" back when I lived in WV, it's actually called a Dobsonfly. They are a variety of insects native to the Americas, Asia and Africa.
Dobsonflies eat small bugs and some plants
A producer
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A Dobsonfly is a large insect with long mandibles, prominent eyes, and clear wings. Males have long mandibles that resemble antlers, while females have shorter, stouter mandibles. They are usually brown or black in color and are known for their intimidating appearance.
A producer
producer it is a plant :)
Producer