All seahorse species

Project Seahorse and the International Union for Conservation of Nature (IUCN) currently recognize 43 species of seahorse. Found mainly in coastal regions all over the world, seahorses come in many different shapes and sizes, from the big-bellied seahorse, which can reach up to 35 cm in length, to pygmy species less than 2 cm long.

Twelve seahorse species are currently listed as threatened on the IUCN Red List of Threatened Species. Many more are considered data-deficient, because we do not yet have enough information about them. You can help by adding your seahorse observations and by providing species IDs for other observations.

Acentronura dendritica
Pipehorse

Acentronura dendritica

Hippocampus abdominalis
Bigbelly seahorse

Hippocampus abdominalis

Hippocampus alatus
Winged seahorse

Hippocampus alatus

Hippocampus algiricus
West african seahorse

Hippocampus algiricus

Hippocampus angustus
Western spiny seahorse

Hippocampus angustus

Hippocampus barbouri
Barbour's seahorse

Hippocampus barbouri

Hippocampus bargibanti
Pygmy seahorse

Hippocampus bargibanti

Hippocampus biocellatus
False-eye seahorse

Hippocampus biocellatus

Hippocampus borboniensis
Réunion seahorse

Hippocampus borboniensis

Hippocampus breviceps
Shorthead seahorse

Hippocampus breviceps

Hippocampus camelopardalis
Giraffe seahorse

Hippocampus camelopardalis

Hippocampus capensis
Knysna seahorse

Hippocampus capensis

Hippocampus colemani
Coleman's pygmy seahorse

Hippocampus colemani

Hippocampus comes
Tiger tail seahorse

Hippocampus comes

Hippocampus coronatus
Crowned seahorse

Hippocampus coronatus

Hippocampus debelius
Softcoral seahorse

Hippocampus debelius

Hippocampus denise
Denise's pygmy seahorse

Hippocampus denise

Hippocampus erectus
Northern seahorse

Hippocampus erectus

Hippocampus fisheri
Fisher's seahorse

Hippocampus fisheri

Hippocampus fuscus
Sea pony

Hippocampus fuscus

Hippocampus guttulatus
Long-snouted seahorse

Hippocampus guttulatus

Hippocampus hippocampus
Short-snouted seahorse

Hippocampus hippocampus

Hippocampus histrix
Spiny seahorse

Hippocampus histrix

Hippocampus ingens
Giant seahorse

Hippocampus ingens

Hippocampus jayakari
Jayakar's seahorse

Hippocampus jayakari

Hippocampus jugumus
Collared seahorse

Hippocampus jugumus

Hippocampus kelloggi
Great seahorse

Hippocampus kelloggi

Hippocampus kuda
Common seahorse

Hippocampus kuda

Hippocampus lichtensteinii
Lichtenstein's seahorse

Hippocampus lichtensteinii

Hippocampus minotaur
Bullneck seahorse

Hippocampus minotaur

Hippocampus mohnikei
Japanese seahorse

Hippocampus mohnikei

Hippocampus montebelloensis
Monte bello seahorse

Hippocampus montebelloensis

Hippocampus patagonicus
Patagonian seahorse

Hippocampus patagonicus

Hippocampus pontohi
Weedy pygmy seahorse

Hippocampus pontohi

Hippocampus procerus
Highcrown seahorse

Hippocampus procerus

Hippocampus pusillus
Dwarf thorny seahorse

Hippocampus pusillus

Hippocampus reidi
Longsnout seahorse

Hippocampus reidi

Hippocampus satomiae
Satomi's pygmy seahorse

Hippocampus satomiae

Hippocampus severnsi
Severn’s pygmy seahorse

Hippocampus severnsi

Hippocampus sindonis
Shiho's seahorse

Hippocampus sindonis

Hippocampus spinosissimus
Queensland seahorse

Hippocampus spinosissimus

Hippocampus subelongatus
West australian seahorse

Hippocampus subelongatus

Hippocampus trimaculatus
Three-spot seahorse

Hippocampus trimaculatus

Hippocampus tyro
Hippocampus tyro

Hippocampus tyro

Hippocampus waleananus
Walea pygmy seahorse

Hippocampus waleananus

Hippocampus whitei
White's seahorse

Hippocampus whitei

Hippocampus zebra
Zebra seahorse

Hippocampus zebra

Hippocampus zosterae
Dwarf seahorse

Hippocampus zosterae

Kyonemichthys rumengani
Kyonemichthys rumengani

Kyonemichthys rumengani

Phyllopteryx taeniolatus
Common seadragon

Phyllopteryx taeniolatus