Australia has around 25 species of seahorses. They include:

Bullneck seahorse - Hippocampus minotaur - found in Southern NSW, and Bass Strait.
Pygmy seahorse - Hippocampus bargibanti - from Queensland north to Japan.
Collared seahorse - Hippocampus jugumus - which is only known from 1 specimen off Lord Howe Island
Smooth seahorse - Hippocampus kampylotrachelos - usually found in Indonesia and the Timor Sea. Australian specimen is known from Ashmore Reef (WA).
Low-crown seahorse - Hippocampus dahli - in coastal waters from Moreton Bay in southeast Queensland to Darwin.
Flat-face seahorse Hippocampus planifrons - Shark Bay and Broome (WA).
False-eyed seahorse - Hippocampus biocellatus - Shark Bay (WA) in shallow algae or weedy reef habitats.
Short-head seahorse - Hippocampus breviceps - in gulfs of South Australia, as well as Bass Strait and Tasmania.
Knobby seahorse - Hippocampus tuberculatus - Perth to Onslow (WA).
Common seahorse - Hippocampus taeniopterus - Moluccan seas, Papua New Guinea, Darwin, tropical waters off the east coast (from about Brisbane north).
Sad seahorse - Hippocampus tristis - Northern NSW, southern QLD and Lord Howe Island.
Winged seahorse - Hippocampus alatus - Northern Australia from WA to Cape York and Papua New Guinea.
Queensland seahorse - Hippocampus queenslandicus- Queensland coast (inner reef waters).
Half-spined seahorse - Hippocampus semispinosus - believed to be off the northwest shelf of Australia.
Eastern Potbelly seahorse - Hippocampus abdominalis - Eden to Newcastle NSW and New Zealand.
Southern Potbelly seahorse - Hippocampus bleekeri - South Australia, Bass Strait and Tasmania.
Zebra seahorse - Hippocampus zebra - Known only from a few specimens off the Queensland coast and Milne Bay Papua New Guinea.
Monte Bello seahorse - Hippocampus montebelloensis - Only known from Monte Bello Island and Exmouth Gulf in WA.
White's seahorse - Hippocampus whitei - Estuaries and harbours of NSW.
High-crown seahorse - Hippocampus procerus -Southern QLD in algae reefs.
West Australian seahorse - Hippocampus elongatus- Western coast north to Kalbarri.
Hedgehog seahorse - Hippocampus spinosissimus - Unconfirmed in Australia, but definitely found in Sapeh Strait, Komodo.
Northern Spiny seahorse - Hippocampus multispinus- NW Western Australia and Northern Territory, also known from Milne Bay, Papua New Guinea.
Thorny seahorse - Hippocampus histrix - Widespread species (Japan to Indonesia and New Caledonia) but not officially confirmed in Australia.
Eastern Spiny seahorse - Hippocampus hendriki - Great Barrier Reef, QLD.
Western Spiny seahorse - Hippocampus angustus - Central Coast of Western Australia.
Big-head seahorse - Hippocampus grandiceps -Known only from the QLD side of the Gulf of Carpentaria.

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