Insect logo



Home Who We Are List of Orders References Contact Us

*** Note: KnowYourInsects.org does its best to include correct identifications of insect photos. It’s always possible that we made a mistake, however, so if you see a misidentification, please contact us and we will correct it. Thanks!

Order Megaloptera: the dobsonflies, alderflies and fishflies — Examples
Families represented below:
Corydalidae (the dobsonflies and fishflies)
Sialidae (the alderflies)

Corydalidae (the dobsonflies and fishflies)

Order Megaloptera
Eastern Dobsonfly, female, Corydalus cornutus, family Corydalidae, (the dobsonflies and fishflies), order Megaloptera.
□ Note the differences in the size of the jaws and the antennae between the female (picture here) and the male (in the next photo).
Photographed by Margaret Ritchie. Identified by: KnowYourInsects.org. Margaret says, “About 3" long - never seen anything like this before!” She adds, “I dont get skittish around bugs or creepy-crawlies but I admit this one got me a bit uncomfortable :-) ” Location: Burlington, Michigan, USA. Date: 13 July, 2016.
Order Megaloptera
Eastern Dobsonfly, male, Corydalus cornutus, family Corydalidae, (the dobsonflies and fishflies), order Megaloptera.
□ The jaws on this male are huge! Despite their scary appearance, the male cannot use those jaws to bite. The female, on the other hand, can bite hard enough to draw blood from a person’s finger.
Photographed by Charine Dowdell. Identified by: KnowYourInsects.org. Location: Carrollton, Georgia, USA. Date: 25 July, 2017. Charine says, “Saw this at a gas station.... I love insects and am extremely fascinated.”
Order Megaloptera
Eastern Dobsonfly, female, Corydalus cornutus, family Corydalidae, (the dobsonflies and fishflies), order Megaloptera.
Photographed by Ginger Bennett and identified by her son (great job!). Ginger says, “This mysterious creature landed on my arm while filling up with gas. I screamed and tried to shake off the nearly 4-inch-long bug, but it would not budge. I grabbed a bottle of water and poured it on my arm and the creature flew into my front passenger seat. This is where I took a picture. My 8-year-old son researched it online and via Google we found your site and identified this as an Eastern Dobsonfly. Thank you for the fascinating information!” Location: Wakefield, Louisiana (at the Mississippi state line), USA. Date: 10 August, 2016.
Add your photo here!
Order Megaloptera
Eastern Dobsonfly, female, Corydalus cornutus, family Corydalidae, (the dobsonflies and fishflies), order Megaloptera.
□ Adult female Eastern Dobsonflies only live a week or so, and the males only survive for about three days. Eastern Dobsonfly larvae, on the other hand, can live up to three years.
Photographed by Timothy Fiala. Identified by: KnowYourInsects.org. Location: Southwest Iowa, USA. Date: 14 July, 2016.
Order Megaloptera
Eastern Dobsonfly, female, Corydalus cornutus, family Corydalidae (the dobsonflies and fishflies), order Megaloptera. Bottom side of the previous photo. And yes, it’s almost 3 inches long!
Photographed by Timothy Fiala. Identified by: KnowYourInsects.org. Location: Southwest Iowa, USA. Date: 14 July, 2016.
Spring Fishfly, Chauliodes rastricornis
Spring Fishfly, Chauliodes rastricornis, family Corydalidae (the dobsonflies and fishflies), order Megaloptera. This is a male (the female doesn’t have comb-like antennae. Instead, she has saw-like antennae).
Photographed by Jackson Bennett. Identified by: KnowYourInsects.org. Location: Whitestown, Indiana, USA. Date: 30 June, 2016. Jackson says, “It was really windy the other day and I think that may have been the reason he died.”
Spring Fishfly, Chauliodes rastricornis
Spring Fishfly, Chauliodes rastricornis, family Corydalidae (the dobsonflies and fishflies), order Megaloptera. Notice that the wings are about twice as long as the body. The name of the order, Megaloptera, fits — it literally means “large wings” in Greek.
Photographed by Jackson Bennett. Identified by: KnowYourInsects.org. Location: Whitestown, Indiana, USA. Date: 30 June, 2016.
Add your photo here!

Sialidae (the alderflies)

Alderfly
Alderfly, genus Sialis, family Sialidae (the alderflies), order Megaloptera.
Photographed by Ed Whitney. Identified by: KnowYourInsects.org. Ed says, “We’ve have these at our cottage for many years. They have odd eggs that are laid on our boat cover and dock posts. They just look like dirt.” Location: Presque Isle, Michigan, USA. Date: 30 June, 2016.
Alderfly
Alderfly (genus Sialis), family Sialidae, order Megaloptera. A closer look at an alderfly.
Photographed by Ed Whitney. Identified by: KnowYourInsects.org. Location: Presque Isle, Michigan, USA. Date: 30 June, 2016.
Add your photo here!


HomeWho We Are List of Orders References Contact Us

Unless noted otherwise, photographs on this website are the property of the photographers and may not be reused without written permission from the photographers. To obtain permission, email the photographers here. High-resolution versions of the photographs are available.

Photos at the top of this website are (from left to right): potato beetle (Leptinotarsa decemlineata) — photo credit: Scott Bauer, U.S. Department of Agriculture; ebony jewelwing (Calopteryx maculata)— photo credit: U.S. Fish and Wildlife Service; sweat bee (Agapostemon splendens) — photo credit: Natalie Allen and Stephanie Kolski, U.S. Geological Survey; preying mantis, monarch butterfly (Danaus plexippus), hellgrammite (aka toe biter) larva and eyed click beetle (Alaus oculatus) — photo credit: Leslie Mertz; Halloween pennant (Celithemis eponina) — photo credit: Kay Meng, U.S. Fish and Wildlife Service.

Reproduction of material from any GoExploreMichigan Media webpages without written permission is strictly prohibited.