Species Profile

Mottled Duskywing Great Lakes Plains population

Scientific Name: Erynnis martialis
Taxonomy Group: Arthropods
Range: Ontario, Quebec
Last COSEWIC Assessment: November 2012
Last COSEWIC Designation: Endangered
SARA Status: No schedule, No Status

Individuals of this species may be protected under Schedule 1 under another name; for more information see Schedule 1, the A-Z Species List, or if applicable, the Related Species table below.

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Image of Mottled Duskywing


Federal Protection

Provincial and Territorial Protection

To know if this species is protected by provincial or territorial laws, consult the provinces' and territories' websites.



PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.

4 record(s) found.

COSEWIC Status Reports

  • COSEWIC Assessment and Status Report on the Mottled Duskywing Erynnis martialis Great Lakes Plains population, Boreal population in Canada (2014)

    Mottled Duskywing (Erynnis martialis) is a butterfly in the skipper family (Hesperiidae). It is a medium-sized (wingspan 23-29 mm) dark grey skipper with a very mottled appearance and a characteristic purplish hue. Yellow-brown spots create the mottled hindwing pattern, which distinguishes the Mottled Duskywing from other duskywing butterflies. Mottled Duskywing is taxonomically distinct with no known subspecies. It is also genetically distinct from its closest relatives. The Mottled Duskywing is a butterfly representative of some of the rarest ecosystems in Canada, such as oak woodlands, pine woodlands, tall grass prairies and alvars with dry or sandy soils and early successional habitat. The Mottled Duskywing is experiencing declines similar to other butterfly species that occupy similar habitats such as the Karner Blue, Frosted Elfin, and Eastern Persius Duskywing, all assessed as extirpated in Canada.

Response Statements

  • Response Statement - Mottled Duskywing, Great Lakes Plains population (2013)

    The population has disappeared from Quebec and now occupies a few, isolated locations in southern Ontario that continue to decline in number. Population numbers are also declining. The species is primarily threatened by habitat fragmentation, but also by habitat loss and degradation through, for example, development, natural succession, fire suppression, and extensive deer browsing.

COSEWIC Annual Reports

  • COSEWIC Annual Report – 2012-2013 (2013)

    Under Canada’s Species at Risk Act (SARA), the foremost function of COSEWIC is to “assess the status of each wildlife species considered by COSEWIC to be at risk and, as part of the assessment, identify existing and potential threats to the species”. COSEWIC held two Wildlife Species Assessment Meetings in this reporting year (October, 2012 to September 2013) from November 25 to November 30, 2012 and from April 28 to May 3, 2013. During the current reporting period, COSEWIC assessed the status or reviewed the classification of 73 wildlife species. The wildlife species assessment results for the 2012-2013 reporting period include the following: Extinct: 0 Extirpated: 2 Endangered: 28 Threatened: 19 Special Concern: 19 Data Deficient: 4 Not at Risk: 1 Total: 73 Of the 73 wildlife species examined, COSEWIC reviewed the classification of 50 species that had been previously assessed. The review of classification for 26 of those species resulted in a confirmation of the same status as the previous assessment.

Consultation Documents

  • Consultation on Amending the List of Species under the Species at Risk Act: Terrestrial Species – December 2013 (2013)

    The Government of Canada is committed to preventing the disappearance of wildlife species at risk from our lands. As part of its strategy for realizing that commitment, on June 5, 2003, the Government of Canada proclaimed the Species at Risk Act (SARA). Attached to the Act is Schedule 1, the list of the species provided for under SARA, also called the List of Wildlife Species at Risk. Endangered or Threatened species on Schedule 1 benefit from the protection of prohibitions and recovery planning under SARA. Special Concern species benefit from its management planning. Schedule 1 has grown from the original 233 to 518 wildlife species at risk. Please submit your comments by March 23, 2014, for terrestrial species undergoing normal consultations and by October 23, 2014, for terrestrial species undergoing extended consultations. Consultation paths.