All species
Currently, we recognize 45 species of seahorse.
Browse the list to learn more about these fabulous fish.
For taxonomy and IUCN Red List status, see the IUCN SSC Seahorse Pipefish and Seadragon Specialist Group seahorse species list.
Other common names: Pot-bellied seahorse
Range: Australia & New Zealand
Size: up to 35 cm (13.8 in)
Range: West Africa
Size: up to 19 cm (7.5 in)
Photo by Daniela De Angelis / Doubledeepdiving.com
Range: Central & Western Indian
Size: 16 cm
iSeahorse/iNaturalist profile (pending)
Other common names: western Australian seahorse, western spiny seahorse
Range: Northern Australia
Size: up to 16 cm (6.3 in)
Range: Indo-Pacific
Size: up to 15 cm (5.9 in)
Range: Indo-Pacific
Size: Up to 2.4 – 2.7 cm (0.9 – 1.1 in)
Other common names: knobby seahorse, short-headed seahorse, short-snouted seahorse
Range: Southern Australia
Size: up to 10 cm (3.9 in)
Range: Western Indian Ocean
Size: up to 10 cm (3.9 in)
Other common name: Cape seahorse
Range: Southern Africa
Size: up to 12 cm (4.7 in)
Range: Indo-Pacific
Size: up to 2.6 cm (1 in)
Range: Southeast Asia
Size: up to 18.7 cm (7.4 in)
Other common name: High-crowned seahorse
Range: Japan & South Korea
Size: up to 12.7 cm (8.7 in)
Range: Northern & Eastern Australia
Size: up to 22 cm (8.7 in)
Red List status: Least Concern
Range: Indo-Pacific
Size: up to 2.1 – 2.4 cm (0.8 – 0.9 in)
Other common names: northern seahorse, spotted seahorse
Range: Western Atlantic
Size: up to 19 cm (7.5 in)
Other common name: Hawaiian seahorse
Range: Pacific (Hawaii)
Size: up to 8 cm (3.1 in)
Other common name: spiny seahorse
Range: Europe & Mediterranean
Size: up to 18 cm (7.1 in)
Range: Korea & Japan
Size: up to 11.4 cm (4.5 in)
Range: Mediterranean, W. Atlantic
Size: up to 15 cm (5.9 in)
Other common name: spiny seahorse
Range: W. Indian Ocean to Central Pacific
Size: up to 17 cm (6.7 in)
Other common name: giant seahorse
Range: California to Peru (Pacific Ocean)
Size: up to 31 cm (12.2 in)
Other common name: Japanese pygmy seahorse
Range: Japan
Size: up to 1.6 cm (0.6 in)
Range: Red Sea to Pakistan
Size: up to 14 cm (5.5 in)
Other common name: Kellogg’s seahorse
Range: Indo-Pacific to E. Africa to China & Australia
Size: up to 28 cm (11 in)
Other common names: common seahorse, estuary seahorse, yellow seahorse, spotted seahorse
Range: Indo-Pacific to E. Africa to China & Australia
Size: up to 17 cm (6.7 in)
Other common name: lemur-tail seahorse
Range: Japan & Korea to Thailand
Size: up to 8 cm (3.2 in)
Range: South Africa
Size: up to 2.2 cm (0.9 in)
Range: Brazil to Argentina
Size: up to 10.3 cm (4.1 in)
Other common name: Pontoh’s pygmy seahorse
Range: Indo-Pacific
Size: up to 1.7 cm (0.7 in)
Other common name: longsnout seahorse
Range: North Carolina (USA) to Brazil
Size: up to 17.5 cm (6.9 in)
Other common name: Satomi’s pygmy seahorse
Range: Indo-Pacific
Size: up to 1.4 cm (0.6 in)
Other common names: Shiho’s seahorse, painted seahorse
Range: Japan
Size: up to 8 cm (3.2 in)
Other common name: Queensland seahorse
Range: Indo-Pacific
Size: up to 17.2 cm (6.8 in)
Range: W. Australia
Size: up to 20 cm (7.9 in)
Other common names: flat-faced seahorse, longnose seahorse, low-crowned seahorse
Range: Indo-Pacific
Size: up to 17 cm (6.7 in)
Other common name: Walea pygmy seahorse
Range: Indonesia
Size: up to 1.8 cm (0.7 in)
Other common names: New Holland seahorse, Sydney seahorse
Range: Solomon Islands, E. Australia
Size: up to 13 cm (5.1 in)
[Updated 08 October 2026]
[Updated 3 February 2022]