Euchloe ausonides insulana

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Island marble butterfly
Island marble butterfly.jpg
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Pieridae
Genus: Euchloe
E. a. insulanus
Trinomial name
Euchloe ausonides insulanus
Guppy & Shepard, 2001

Euchloe ausonides insulanus, the island marble butterfly, is a subspecies of butterfly found in the San Juan Islands in Washington in the northwestern United States.

In 1998 the island marble, thought to be extinct since 1908, was discovered during a prairie butterfly survey in San Juan Island National Historical Park.[1]

The Canadian Species at Risk Act (SARA) listed the island marble butterfly as being extirpated in Canada in May 2000 and again in April 2010.[2]

On August 22, 2012, the Xerces Society for Invertebrate Conservation submitted a petition for protection with the US Fish and Wildlife Service (USFWS).[3][4] Although not yet listed as endangered, the island marble butterfly is currently noted on the Washington State Species of Concern List.[5] In April 2018, the USFWS proposed to list the butterfly as endangered.[6]

On May 5, 2020, the island marble butterfly was listed as endangered under the Endangered Species Act of 1973.[7]


  1. ^ "San Juan Island National Historical Park – The Island Marble Butterfly (U.S. National Park Service)" National Park Service – Experience Your America | February 9, 2009. <>
  2. ^ "Species Profile: Island Marble" Government of Canada | Species at Risk Public Registry <>
  3. ^ "Fighting For Its Life (Again): The Island Marble Butterfly" Crag Law Center | June 25, 2013. < Archived 2014-09-25 at the Wayback Machine>
  4. ^ "The Imperiled Island Marble Butterfly" The Island Guardian | August 23, 2012. <>
  5. ^ "Species of Concern in Washington State" Washington Department of Fish & Wildlife Conservation <>
  6. ^ Jenkins, Don (April 12, 2018). "Washington butterfly up for ESA protection". Capital Press. Retrieved April 12, 2018.
  7. ^ States, United (May 5, 2020). "Endangered and Threatened Wildlife and Plants; Endangered Status for the Island Marble Butterfly and Designation of Critical Habitat". United States Government. Retrieved May 5, 2020.

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