- Source: Oarisma poweshiek
Oarisma poweshiek, the Poweshiek skipperling, is a North American butterfly in the family Hesperiidae (skippers), subfamily Hesperiinae (grass skippers). The range of this species in Canada is restricted to southeastern Manitoba, and in the United States it historically ranged from the Dakotas to the southern Lower Peninsula of Michigan.
Description
Coloured dark brown on the upperside with an orange along the costa. The underside of the hindwings are dark grey with white veins.
Wingspan is from 24 to 30 mm.
Behaviour
The Poweshiek skipperling emerges in late June or early July and exists in the adult form for approximately a two-week period. During this time the skipperling nectars on a suite of flowers, mates and lays eggs. The larvae feed on graminoid plant species that possibly vary throughout the distribution of this species.
Conservation status
The Poweshiek skipperling was a common prairie butterfly prior to 2005, but suffered a population crash between 2005 and 2015. The Poweshiek skipperling has a NatureServe ranking of G1 or critically imperiled. It is threatened by degradation and modification of its native prairie habitat by overgrazing, invasive species, and conversion to cropland. This species was awarded endangered status under the United States Endangered Species Act in 2014 after gaining candidate status in 2011. The Poweshiek skipperling was assessed as threatened by Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2003, then, in 2005, the species was added to Schedule 1 with the status threatened under the Species at Risk Act (SARA), in Canada. In 2014, the species was reassessed as endangered by COSEWIC. In February 2019, the SARA status was changed to endangered.
In 2018, the Minnesota Zoo began efforts to rear them in captivity, for release in the wild. In 2022, the Minnesota Zoo released over 100 individuals in to the wild.
References
External links
Abdel-Razzaq, L. (November 17, 2013). "Michigan could be last hope for rare butterfly, feds say". The Detroit News. Archived from the original on November 19, 2013.
NatureServe. 2014. Oarisma poweshiek. NatureServe Explorer.
Further reading
Swengel, A. B. and S. R. Swengel. (2014). Paradoxes of Poweshiek Skipperling (Oarisma poweshiek) (Lepidoptera: Hesperiidae): Abundance patterns and management of a highly imperiled prairie species. ISRN Entomology 2014 216427.