A possible fourth species, Eucosmodon kuszmauli, has also been named.

A possible fourth species was discovered in 2008, but has yet to receive a taxonomic name.

There are five more possible species of which trace fossils have been found.

"Eventually, we'll have to deal with thousands of possible species, but with a tenth as many staffers."

There is at least two possible species which has not yet been described:

A possible sixth species, as yet unidentified, has been found in Laos.

A possible second species is known from South Africa.

In 2001 I. tiliosi was listed as a possible new species, but has not yet been officially described.

He used details in contemporary accounts to narrow the field of possible species.

Butterflies are common here, with sightings of numerous species possible.