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Keywords from Image Description:
FMIB Swordtail Minnow male Xiphorphorus helleri Heckel The anal fin modified as an intromittent organ Vera Cruz.jpeg Swordtail Minnow male Xiphorphorus helleri Heckel The anal fin modified as an intromittent organ Vera Cruz Subject Xiphophorus Tag Fish Cite book Fishes Jordan David Starr New York City NY Henry Holt and Company