Rana Arlequin Variable vs Malvasa Stubfoot Toad

Atelopus varius compared with Atelopus eusebianus

Taxonomic Classification

Rank	Rana Arlequin Variable	Malvasa Stubfoot Toad
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (cordados)	Chordata (cordados)
Class same	Amphibia (Amphibians)	Amphibia (Amphibians)
Order same	Anura (Frogs & Toads)	Anura (Frogs & Toads)
Family same	Bufonidae	Bufonidae
Genus same	Atelopus	Atelopus
Species	Atelopus varius	Atelopus eusebianus

Evolutionary Relationship

Rana Arlequin Variable and Malvasa Stubfoot Toad share a common ancestor at the Genus level: Atelopus.

Conservation Status

Rana Arlequin Variable

CR — Critically Endangered

Malvasa Stubfoot Toad

CR — Critically Endangered

Physical Characteristics

Attribute	Rana Arlequin Variable	Malvasa Stubfoot Toad
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Rana Arlequin Variable

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Malvasa Stubfoot Toad

Habitat

Typically found in freshwater habitats, moist forests, and wetlands.

Range

Found in Colombia. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Rana Arlequin Variable

The clown frog (Atelopus varius), also known as the harlequin frog or variable harlequin toad, is a small, vibrantly colored true toad in the family Bufonidae native to the premontane and montane rainforests of Costa Rica and Panama. Adults display bold black-and-yellow or black-and-orange aposematic patterns that warn predators of their skin toxins. Males typically measure 27–39 mm in snout-vent length and females slightly larger. The species inhabits fast-flowing streams in humid highland forests at elevations generally between 200 and 1,800 m, where breeding occurs in riparian zones. Atelopus varius was once common throughout its range but has suffered catastrophic population declines since the 1980s, primarily due to the chytrid fungal pathogen Batrachochytrium dendrobatidis (Bd), which has driven mass mortality events in amphibians globally. Additional threats include habitat loss from deforestation and agricultural expansion. The species is listed as Critically Endangered by the IUCN. Conservation programs involving captive breeding and disease-resistant population management are underway in Costa Rica and Panama in collaboration with international zoos.