The Order Gasterosteiformes contains these Families:

• 276. Hypoptychidae [sand eel]
• 277. Aulorhynchidae [tubesnouts]
• 278. Gasterosteidae [sticklebacks]
• 279. Pegasidae [seamoths]
• 280. Solenostomidae [ghost pipefishes]
• 281. Syngnathidae [pipefishes and seahorses]
• 282. Indostomidae [indostomids]
• 283. Aulostomidae [trumpetfishes]
• 284. Fistulariidae [cornetfishes]
• 285. Macrorhamphosidae [snipefishes]
• 286. Centriscidae [shrimpfishes]