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The percomorph fish are the most derived to date. These include an extremely wide variety of body shapes from flatfish to seahorses. Animals like tunas and porcupine fish are also encompassed within this group. Although the Percomorpha as a group is known from the Late Cretaceous and extremely well represented - both quantitavely and qualitavely - from Eocene deposits, the extant families have very limited fossil records, rarely extending beyond twenty million years ago.