Common Seahorse vs Simons’s Mouse Opossum

Hippocampus kuda compared with Marmosa simonsi

Key Differences

• Common Seahorse is Vulnerable while Simons’s Mouse Opossum is Not Evaluated.

Taxonomic Classification

Rank	Common Seahorse	Simons’s Mouse Opossum
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Actinopterygii (Ray-finned Fish)	Mammalia (Mammals)
Order	Perciformes (Perch-like Fish)	Didelphimorphia (Didelphimorphia)
Family	Pomacentridae (Clownfish & Damselfish)	Didelphidae
Genus	Amphiprion (Clownfish)	Marmosa
Species	Hippocampus kuda	Marmosa simonsi

Evolutionary Relationship

Common Seahorse and Simons’s Mouse Opossum share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Seahorse

VU — Vulnerable

Trend: Decreasing ↓

Simons’s Mouse Opossum

NE — Not Evaluated

Physical Characteristics

Attribute	Common Seahorse	Simons’s Mouse Opossum
Diet	Carnivore	—
Average Lifespan	5 years	—
Average Length	17 cm	—
Average Weight	10 g	—

Habitat & Geographic Range

Common Seahorse

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 7 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Australia, India, Indonesia, Japan, and Philippines. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Simons’s Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador.

Common Seahorse

The common seahorse is found in tropical and temperate waters. Males carry and deliver the babies.