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Where do sand lances in the family Hypoptychidae occur?
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gasterosteiform
Lined seahorse (Hippocampus erectus).
The family Hypoptychidae, which includes the sand lances, consists of marine fishes found in the waters around Japan and Korea, extending north to the Sea of Okhotsk.1
These fishes are members of the order Gasterosteiformes and are distinct from the sand lances of the family Ammodytidae, which are classified under the order Perciformes.231