Black Crystalwort vs Common Metad

Riccia nigrella compared with Millardia meltada

Key Differences

• Black Crystalwort is Not Evaluated while Common Metad is Least Concern.

Taxonomic Classification

Rank	Black Crystalwort	Common Metad
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Marchantiophyta (liverwort)	Chordata (Chordates)
Class	Marchantiopsida (Marchantiopsida)	Mammalia (Mammals)
Order	Marchantiales (Marchantiales)	Rodentia (Rodents)
Family	Ricciaceae	Muridae (Mice & Rats)
Genus	Riccia	Millardia
Species	Riccia nigrella	Millardia meltada

Conservation Status

Black Crystalwort

NE — Not Evaluated

Common Metad

LC — Least Concern

Physical Characteristics

Attribute	Black Crystalwort	Common Metad
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black Crystalwort

Habitat

Native to Asia and Europe and Oceania, inhabiting ecosystems characteristic of the region.

Range

Distributed across Chile, Japan, New Zealand, Norway, and Portugal.

Common Metad

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Black Crystalwort

The Black Crystalwort (Riccia nigrella) is a species in the genus Riccia. Native to Asia and Europe and Oceania, inhabiting ecosystems characteristic of the region. Distributed across Chile, Japan, New Zealand, Norway, and Portugal.

Common Metad

The Common Metad (<em>Millardia meltada</em>) is a rodent belonging to the genus <em>Millardia</em> within the family Muridae. As a member of the Old World rats and mice, this species is typically found in diverse terrestrial and aquatic ecosystems across its range. The Common Metad is classified as Least Concern on the IUCN Red List, indicating that its populations are currently stable and not facing immediate extinction risk. Detailed biological traits such as body length, weight, and lifespan have not been widely documented for this species in available records. Its taxonomy places it within the order Rodentia, which encompasses a broad array of gnawing mammals adapted to a wide variety of ecological niches. While specific dietary habits are not well characterized in the available data, members of the genus <em>Millardia</em> are generally understood to be omnivorous, feeding on plant material and invertebrates typical of their habitat. Ongoing monitoring is important for ensuring this species maintains its current conservation standing.