Black roughscale catshark vs Rootless Duckweed

Apristurus melanoasper compared with Wolffia arrhiza

Key Differences

• Black roughscale catshark is Least Concern while Rootless Duckweed is Endangered.

Taxonomic Classification

Rank	Black roughscale catshark	Rootless Duckweed
Kingdom	Animalia (動物)	Plantae (植物)
Phylum	Chordata (脊索動物)	Magnoliophyta (被子植物門)
Class	Chondrichthyes (軟骨魚綱)	Liliopsida (単子葉植物綱)
Order	Carcharhiniformes (メジロザメ目)	Alismatales (オモダカ目)
Family	Scyliorhinidae	Araceae
Genus	Apristurus	Wolffia
Species	Apristurus melanoasper	Wolffia arrhiza

Conservation Status

Black roughscale catshark

LC — Least Concern

Rootless Duckweed

EN — Endangered

Physical Characteristics

Attribute	Black roughscale catshark	Rootless Duckweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black roughscale catshark

Habitat

Typically found in marine environments from coastal waters to deep ocean.

Rootless Duckweed

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, temperate broadleaf and mixed forests, and temperate coniferous forests, among 4 distinct biome types spanning the Indomalayan and Oceanian and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Japan), Europe (10 countries), North America (Canada), and South America (Brazil). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Black roughscale catshark

The Black roughscale catshark (Apristurus melanoasper) is a species in the genus Apristurus. It is currently classified as Least Concern on the IUCN Red List. Typically found in marine environments from coastal waters to deep ocean.