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Seahorses, Pipefish & Leafy Sea Dragons
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Seahorses, Pipefish & Leafy Sea Dragons belong to a family of fish called Syngnathidae, which belongs to a group (Phylum) called Chordata. So do seahorses have an exoskeleton or endoskeleton?
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Seahoeses are fish and therefore vertebrates. There is no problem with their classification. They do not have a complete exoskeleton and even if they did this would no more make them invertebrates than it does armadillos, pangolins, tortoises, turtles or crocodilians. They have fins and gills just like "regular" fish. They have no ability to breathe through their skin nor any land-living phase which could get them confused with amphibians. Arthropods (insects, arachnids, millipedes and crustaceans) have exoskeletons but they have no internal spinal cord or vertebral column plus they have jointed legs (from which the phylum gets its name). Highly unusual and heavily adapted they may be but seahorses are just pipefish that learned to swim upright.
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