how many species of seahorse and what are they look like?

Question

SEAHORSE.

Answer 1

There are approximately 35 known species of seahorse including:

Hippocampus abdominalis : (Big-belly seahorse) which is found off the coast of New Zealand and south and east Australia
Hippocampus algiricus : (West African Seahorse)
Hippocampus angustus: (Narrow Bellied Seahorse)
Hippocampus barbouri : (Barbour's seahorse or Zebra-snout seahorse)
Hippocampus bargibanti (Pygmy Seahorse) which is found in the West Pacific area (Indonesia, Philippines, Papua New Guinea, Salomon Islands, etc.)
Hippocampus borboniensis : (Réunion Seahorse)
Hippocampus breviceps: (Short Snouted Seahorse) which is found off the coast of south and east Australia
Hippocampus camelopardalis: (Giraffe Seahorse)
Hippocampus capensis: (Knysna Seahorse)
Hippocampus colemani: (Coleman's Seahorse)
Hippocampus comes: (Tiger Tail Seahorse) which is found in the Far East
Hippocampus coronatus: (Crowned Seahorse)
Hippocampus denise: (Denise's Seahorse)
Hippocampus erectus: (Lined Seahorse) which is found off the east coast of the Americas, between Nova Scotia and Uruguay
Hippocampus fisheri: (Fisher's Seahorse)
Hippocampus fuscus: (Sea Pony) which is found in the Indian Ocean
Hippocampus guttulatus: (Speckled Seahorse)
Hippocampus hippocampus: (European Seahorse) which is found in the Mediterranean Sea and Atlantic Ocean
Hippocampus histrix: (Thorny Seahorse) which is found in the Indian Ocean, Persian Gulf, Red Sea, and the Far East
Hippocampus ingens: (Pacific Seahorse) which is found off the Pacific coast of North, Central and South America)
Hippocampus jayakari: (Jayakar's Seahorse)
Hippocampus kelloggi: (Great Seahorse)
Hippocampus kuda: (Spotted Seahorse)
Hippocampus lichtensteinii: (Lichtenstein's Seahorse)
Hippocampus minotaur: (Bullneck Seahorse)
Hippocampus mohnikei: (Japanese Seahorse)
Hippocampus procerus: (Hippocampus procerus)
Hippocampus reidi: (Brazilian Seahorse) which is found in the Caribbean in coral reefs
Hippocampus sindonis: (Shiho's seahorse)
Hippocampus spinosissimus: (Hedgehog Seahorse)
Hippocampus subelongatus: (Tigersnout Seahorse or West Australian Seahorse)
Hippocampus trimaculatus: (Three-Spot Seahorse)
Hippocampus tuberculatus: (Knobby Seahorse)
Hippocampus whitei: (White's Seahorse) which is found off the coast of east Australia
Hippocampus zebra: (Zebra Seahorse)
Hippocampus zosterae: (Dwarf Seahorse) which is found in the Gulf of Mexico and the Caribbean)

Some pictures can be found at: http://gallery.seahorse.org/main.php?g2_view=core.ShowItem&g2_itemId=12

Answer 2

Heres a gallery of pictures of the different kinds...
http://www.seahorse.org/gallery/main.php?g2_view=core.ShowItem&g2_itemId=12&g2_GALLERYSID=e6092f996846d072d22c0c0f325e86be

and heres the different kinds:

Types of Seahorses ~ SCIENTIFIC NAME / COMMON NAME

Hippocampus abdominalis - Big Belly Sea Horse
Hippocampus aimei - Freshwater Sea Horse
Hippocampus algiricus - West African Sea Horse
Hippocampus angustus - Western Australian Sea Horse or Narrow-bellied Sea Horse
Hippocampus antiquorum -
Hippocampus barbouri - Barbour's Sea Horse
Hippocampus bargibanti - Bargibant's Sea Horse or Pygmy Sea Horse
Hippocampus borboniensis - Réunion Sea Horse
Hippocampus breviceps - Short-snouted Sea Horse or Short-head Sea Horse
Hippocampus brevirostris - Short-snouted Sea Horse or Short-nosed Sea Horse
Hippocampus camelopardalis - Giraffe Sea Horse
Hippocampus capensis - Spinach pipefish or Knysna Sea Horse
Hippocampus comes - Tiger tail Sea Horse
Hippocampus coronatus - Japanese Sea Horse or Red and Black Sea Horse
Hippocampus dahli - Synonym for Hippocampus planifrons
Hippocampus denise - Denise's pygmy seahorse
Hippocampus erectus - Atlantic Lined Sea Horse or Northern Sea Horse
Hippocampus fisheri - Fisher's Sea Horse
Hippocampus fuscus - Black Sea Horse or Sea pony
Hippocampus guttulatus - Long-snouted Sea Horse
Hippocampus heptagonus - Synonym for Hippocampus erectus
Hippocampus hilonis - Synonym for Hippocampus kuda
Hippocampus hippocampus - Short-snouted Sea Horse
Hippocampus histrix - Yellow Sea Horse or Thorny Sea Horse
Hippocampus hudsonius - Synonym for Hippocampus erectus
Hippocampus hunsonius punctulatus - Synonym for Hippocampus erectus
Hippocampus ingens - Pacific Sea Horse or California Sea Horse
Hippocampus jayakari - Jayakar's Sea Horse
Hippocampus kelloggi - Great Sea Horse
Hippocampus kuda - Oceanic Sea Horse or Kellogg's Sea Horse or Common Sea Horse or Yellow Sea Horse or Spotted Sea Horse
Hippocampus laevicaudatus - Synonym for Hippocampus erectus
Hippocampus lenis - Synonym for Hippocampus planifrons
Hippocampus lichtensteinii - Lichtenstein's Sea Horse
Hippocampus melanospilos - Synonym for Hippocampus kuda
Hippocampus minotaur - Bullneck Sea Horse
Hippocampus mohnikei - Japanese Sea Horse
Hippocampus moluccensis - Synonym for Hippocampus kuda
Hippocampus novae-hollandiae - Synonym for Hippocampus whitei
Hippocampus obtusus -
Hippocampus planifrons - Dahl's Sea Horse
Hippocampus polytaenia - Synonym for Hippocampus kuda
Hippocampus punctulatus - Synonym for Hippocampus erectus
Hippocampus ramulosus - Mediterranean Sea Horse
Hippocampus regulus -
Hippocampus reidi - Brazillian Sea Horse
Hippocampus rhynchomacer - Synonym for Hippocampus kuda
Hippocampus sindonis - Dhiho's Sea Horse
Hippocampus spinosissimus - Hedgehog Sea Horse
Hippocampus subelongatus - West Australian Sea Horse
Hippocampus taeniopterus - Synonym for Hippocampus kuda
Hippocampus takakurae - Tanaka Threespot Sea Horse
Hippocampus trimaculatus - Longnose Sea Horse
Hippocampus tristis - Sad Sea Horse
Hippocampus whitei - Crowned Sea Horse or Sydney Sea Horse or New Holland Sea Horse or White's Sea Horse
Hippocampus zosterae - Dwarf Sea Horse

heres some facts:

Covering and camouflage
Seahorses are not covered in scales like other fish. Instead they have bony plates which help protect their bodies. As seahorses do not have ribs, the bony plates do the job. Some kinds of seahorse develop spiky bits that look like twigs sticking out, and these help with camouflage. Seahorses change colour to match their surroundings. They do this by expanding or contracting the pigment cells in their skin. They can appear in many colours from white to black, greens, bright oranges and reds.


Size
There are about 35 different kinds of seahorse as far as we know. They range in size from less than a centimetre to about 30 centimetres.



Habitat
Seahorses are found in the warmer coastline waters of the world.



Diet
Seahorses feed on brine shrimp, tiny fish and plankton. A seahorse sucks in food through its long snout, and is continually feeding. Seahorses have no teeth and swallow live food whole.


Dangers to seahorses
Seahorse predators include crabs, rays and tuna. Seahorses can be torn away from where they are clinging by storms and tossed ashore. Tossed around in stormy waters, seahorses can die of exhaustion if they are unable to grab hold of something with their tail.

People threaten the seahorse's survival. Polluted water and fishing pose dangers, but also they are hunted to be used for medicine, cooking or for souvenirs.