Common Least Skipper vs Onion Downy Mildew

Ancyloxypha numitor compared with Peronospora destructor

Key Differences

Common Least Skipper is Least Concern while Onion Downy Mildew is Not Evaluated.

Taxonomic Classification

Rank	Common Least Skipper	Onion Downy Mildew
Kingdom	Animalia (Animals)	Chromista (Chromista)
Phylum	Arthropoda (Arthropods)	Oomycota (Oomycetes)
Class	Insecta (Insects)	Peronosporea (Peronosporea)
Order	Lepidoptera (Butterflies & Moths)	Peronosporales (Peronosporales)
Family	Hesperiidae	Peronosporaceae
Genus	Ancyloxypha	Peronospora
Species	Ancyloxypha numitor	Peronospora destructor

Conservation Status

Common Least Skipper

LC — Least Concern

Onion Downy Mildew

NE — Not Evaluated

Physical Characteristics

Attribute	Common Least Skipper	Onion Downy Mildew
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Least Skipper

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Canada and United States.

Onion Downy Mildew

Habitat

Native to Europe and North America and South America, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Europe (4 countries), North America (United States), and South America (Brazil).

Common Least Skipper

The Common Least Skipper (<em>Ancyloxypha numitor</em>) is a small butterfly in the family Hesperiidae, classified as Least Concern on the IUCN Red List. It is native to Canada and the United States, where it typically inhabits virtually all terrestrial and freshwater habitats within its range, showing a particular affinity for moist, grassy areas near water. The species is among the smallest skippers in North America, characterized by orange and brown wing coloration and a rapid, low-flying flight pattern close to vegetation. Adults typically nectar on small flowers while larvae feed on grasses, particularly those in wet meadows, marshes, stream margins, and disturbed grassy areas. The Common Least Skipper is frequently observed in wetland margins, wet prairies, and roadsides with rank grass growth. Its wide distribution across North America and habitat generalism across moist grassland and wetland types support its stable population and Least Concern conservation status. Biological traits of this species remain poorly documented in the scientific literature.