Common Seahorse vs Question Mark

Hippocampus kuda compared with Polygonia interrogationis

Key Differences

• Common Seahorse is Vulnerable while Question Mark is Least Concern.

Taxonomic Classification

Rank	Common Seahorse	Question Mark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Actinopterygii (Ray-finned Fish)	Insecta (Insects)
Order	Perciformes (Perch-like Fish)	Lepidoptera (Butterflies & Moths)
Family	Pomacentridae (Clownfish & Damselfish)	Nymphalidae (Brush-footed Butterflies)
Genus	Amphiprion (Clownfish)	Polygonia
Species	Hippocampus kuda	Polygonia interrogationis

Evolutionary Relationship

Common Seahorse and Question Mark share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Common Seahorse

VU — Vulnerable

Trend: Decreasing ↓

Question Mark

LC — Least Concern

Physical Characteristics

Attribute	Common Seahorse	Question Mark
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.

Question Mark

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Canada and United States.

Common Seahorse

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