The scientific name for the dobsonfly is Corydalus cornutus.
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
I found a few good pictures and some information at the following site. http://insects.tamu.edu/fieldguide/bimg121.html
Being as all bugs and beetles have 6 legs and antennae, the description is not much to go on. Further, masses of beetles are about an inch long and brown. Be a bit more descriptive and you may get an answer. I suggest a cockroach as one possibility, but exactly how thin do you mean.
There aren't any known insects with large tentacles. However, the male dobsonfly appears to have tentacle-like structures coming out of its mouth. Although male dobsonflies have large mandibles, they are harmless since they are too weak to break human skin. However, the females' smaller mandibles are capable of delivering a painful bite.
I have kept a couple adult specimens for a short time. Unfortunately, their life cycle is all but finished once they reach their adult phase. I kept a female specimen for three months, and I even observed her feeding in the face of convenitonal wisdom that states the adults do not eat. If you really want a challenge, find the larvae- hellgrammites- and raise them in fast running water until they pupate.
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