Tag Archives: Nepidae

What’s the Water Scorpion’s favorite drink? Insect Slurpee.

We are as happy as a heron in a fish pond to welcome¬†the MObugs blog’s own Shelly Cox to our anniversary site. She is kind enough to share some of her writing on aquatic insects with YOU, dear readers. Go check out her blog, which is chock full of all kinds of nutty bugs, all native to Missouri!

This crazy looking stick-like insect is NOT a Stick Insect. It is in fact a Water Scorpion in the family Nepidae. They are in the same order as other true bugs, Hemiptera. In spite of their common name of “scorpion” they look nothing like a typical terrestrail scorpion that we’ve all seen in pictures or on nature programming.

Water Scorpion
photo by Shelly Cox, of the MObugs blog.

They do not have a stinging tail or venom that they inject with a painful sting. They are very long and thin just as this picture shows. Their front two front legs are used to grab insect prey and pull it back into their mouth to feed. They will eat tadpoles, tiny fish like minnows or offspring of other fish (in captivity they do well on young guppies), they will also feed on other aquatic insects. Their mouth is much like another group of insects within this order called the assassin bugs. It is a beak-like structure that pierces the outer skeleton of their prey, then they inject them with an enzyme which sedates their prey as well as liquefying the insides of the unfortunate victim. The water scorpion can then slurp up the insides like an insect slurpee.

The long “tails” that protrude from the backside of the scorpion are actually breathing tubes. They typically float on debris or plants near the waters surface where they will extend their breathing tubes out of the water. They can swim, but seldom do unless disturbed.¬† They will overwinter as adults and lay eggs the following spring. The female will lay her eggs in vegetation near the shore line or on the surface of the water. In about 2 to 4 weeks the eggs hatch and the young begin feeding on tiny insect prey. It takes them about 2 months to reach maturity. It is not uncommon to see one of these crazy looking insect reach lengths up to 5 or 6 inches. These crazy bugs possess wings and will fly.

photo by Shelly Cox, of the MObugs blog
photo by Shelly Cox, of the MObugs blog

The one pictured here was captured by a little girl during a field trip to my office. We were hosting a local preschool for a field trip to the pond. We divided the group into two separate groups. One half of the group fished, while the other half mucked around in the pond for aquatic insects. Then we switched the groups. One of the girls in the first group pulled her net into shore and screamed that she caught a water spider. I went to investigate and discovered that she had caught this water scorpion. It was only the second one I’ve ever seen and certainly the biggest at approximately 3 1/2 inches in length. I made a big deal out of her capture and told her what a special insect she caught. She was thrilled. After the group left I kept the scorpion and placed it in a tank. I’ve been feeding it freeze dried crickets. We will keep it for a few weeks and use if for programs before releasing it back to the pond it came out of.

Visiting the pond, lake, stream or other water source and exploring for a few hours with something as simple as a net and a shallow dish can yield all sorts of interesting insects to learn about. Get out and discover what is hiding below the surface.