Blue star vs common hydra

Amsonia orientalis compared with Hydra vulgaris

Key Differences

• Blue star is Critically Endangered while common hydra is Not Evaluated.

Taxonomic Classification

Rank	Blue star	common hydra
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Cnidaria (Cnidarians)
Class	Magnoliopsida (Dicots)	Hydrozoa (Hydrozoa)
Order	Gentianales (Gentianales)	Anthoathecata (Anthoathecata)
Family	Apocynaceae	Hydridae
Genus	Amsonia	Hydra
Species	Amsonia orientalis	Hydra vulgaris

Conservation Status

Blue star

CR — Critically Endangered

common hydra

NE — Not Evaluated

Physical Characteristics

Attribute	Blue star	common hydra
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blue star

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

common hydra

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Blue star

The Blue star (Amsonia orientalis) is a species in the genus Amsonia. It is currently classified as Critically Endangered on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

common hydra

<em>Hydra vulgaris</em>, commonly known as the common hydra, is a small freshwater cnidarian in the family Hydridae. Its conservation status has not been formally evaluated by the IUCN. The species is recorded from Denmark, Norway, and Sweden, with its native range understood to encompass Europe broadly. It typically inhabits slow-moving or still freshwater bodies such as ponds, lakes, and streams, where it attaches to aquatic vegetation or submerged substrates. The common hydra is notable for its remarkable regenerative capabilities and has been the subject of substantial biological research. Diet information for this species is not available in current records. Biological traits of this species remain poorly documented in the scientific literature.