Island-marble

Guides

• Euchloe ausonides

  Large Marble, Creamy Marblewing

  Euchloe ausonides, commonly known as the Large Marble or Creamy Marblewing, is a medium-sized butterfly in the family Pieridae native to western North America. The species exhibits remarkable camouflage behavior, with adults capable of orienting themselves against backgrounds to render nearly invisible despite their contrasting wing patterns. Population declines have been documented in California since the 1980s, particularly in the Central Valley and Bay Area, with the species now considered regionally extinct at low-elevation sites in some areas. One subspecies, E. a. insulanus (Island Marble), is federally endangered and endemic to the San Juan Islands of Washington State.

  butterflyPieridaewestern-North-Americacamouflageendangered-subspeciesclimate-change-indicatormustard-family-host-plantspopulation-declineIsland-Marblediapause-research