Arrow-head tree snail vs brittlestar

Partula sagitta compared with Amphiura filiformis

Key Differences

• Arrow-head tree snail is Extinct while brittlestar is Least Concern.

Taxonomic Classification

Rank	Arrow-head tree snail	brittlestar
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Echinodermata (Echinoderms)
Class	Gastropoda (Gastropoda)	Ophiuroidea (Ophiuroidea)
Order	Stylommatophora (Stylommatophora)	Amphilepidida (Amphilepidida)
Family	Partulidae	Amphiuridae
Genus	Partula	Amphiura
Species	Partula sagitta	Amphiura filiformis

Evolutionary Relationship

Arrow-head tree snail and brittlestar share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Arrow-head tree snail

EX — Extinct

brittlestar

LC — Least Concern

Physical Characteristics

Attribute	Arrow-head tree snail	brittlestar
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arrow-head tree snail

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

brittlestar

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Arrow-head tree snail

The Arrow-head tree snail, Partula sagitta, is a species. It is currently assessed as extinct on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

brittlestar

The Brittlestar (Amphiura filiformis) is a species in the genus Amphiura. It is currently classified as Least Concern on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.