''Alloperla roberti'', the Illinois sawfly or Robert's stonefly, is a species of

stonefly Plecoptera is an order of insects commonly known as stoneflies. Some 3,500 species are described worldwide, with new species still being discovered. Stoneflies are found worldwide, except Antarctica. Stoneflies are believed to be one of the most ...

in the family Chloroperlidae. It was

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash River, Wabash and Ohio River, Ohio rivers to its ...

and its type locality was in Rock Island County. It has not been seen since 1860 and is likely

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

References

Chloroperlidae Insects described in 1981 Extinct insects since 1500 Extinct animals of the United States Endemic fauna of Illinois Endemic insects of the United States Taxonomy articles created by Polbot {{Plecoptera-stub