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Where have many Eocene and Oligocene gasterosteiform fossils been discovered?

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Lined seahorse (Hippocampus erectus) — gasterosteiform Lined seahorse (*Hippocampus erectus*).

Many Eocene and Oligocene gasterosteiform fossils have been discovered in the area of Monte Bolca near Verona, Italy. Additionally, deposits in Sumatra have yielded representatives from the extinct family Protosyngnathidae.1