Black Tar Spot vs Laysan Duck

Rhytisma acerinum compared with Anas laysanensis

Key Differences

Black Tar Spot is Least Concern while Laysan Duck is Critically Endangered.

Taxonomic Classification

Rank	Black Tar Spot	Laysan Duck
Kingdom	Fungi (Fungi)	Animalia (Animals)
Phylum	Ascomycota (Sac Fungi)	Chordata (Chordates)
Class	Leotiomycetes (Leotiomycetes)	Aves (Birds)
Order	Rhytismatales (Rhytismatales)	Anseriformes (Anseriformes)
Family	Rhytismataceae	Anatidae
Genus	Rhytisma	Anas
Species	Rhytisma acerinum	Anas laysanensis

Conservation Status

Black Tar Spot

LC — Least Concern

Laysan Duck

CR — Critically Endangered

Physical Characteristics

Attribute	Black Tar Spot	Laysan Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black Tar Spot

Habitat

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

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Laysan Duck

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and Mediterranean forests and woodlands within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Belgium, France, Netherlands, Norway, and United Kingdom. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Black Tar Spot

The Black Tar Spot (Rhytisma acerinum) is a species in the genus Rhytisma. It is currently classified as Least Concern on the IUCN Red List. Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Laysan Duck

Laysan Duck (Anas laysanensis) is classified as Critically Endangered (CR) on the IUCN Red List. Facing an extremely high risk of extinction in the wild due to severe population decline and habitat loss.