seahorse


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seahorse,

common name for certain small fishes of the family Syngnathidae, inhabiting warm waters but sometimes found as far north as Cape Cod. The elongated head and snout of a seahorse, flexed at right angles to the body, suggest those of a horse.

Members of different species range in size from .6 to 8 in. (1.6–20 cm); all feed on minute organisms. Protected by thin bony plates that are derivatives of the scales found in most fishes, the seahorse swims weakly in an upright position by means of rapid, hummingbirdlike beats of its fins; at rest it curls its thin, prehensile tail around seaweed. Some seahorses, known as seadragons, have deceptive leaflike appendages; others are poisonous.

While linked in the mating embrace (during which the seahorses utter musical sounds) the female forces the eggs into a pouch on the underside of the male, where they are fertilized and where they remain, feeding on nutrients provided by the vascular lining of the pouch, until they are expelled as miniature versions of the adult.

The many species of pipefishes belong to the same family. They range in size from 4 to 12 in. (10–30 cm) long. They are slightly more fishlike in appearance and are able to change color, but have the long snout and unusual breeding habits of the seahorse.

Seahorses are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Syngnathiformes, family Syngnathidae.

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