Keywords: FMIB 51866 Sword-tail Minnow, male, Xiphorphorus helleri Heckel The anal fin modified as an intromittent organ Vera Cruz.jpeg Sword-tail Minnow male Xiphorphorus helleri Heckel The anal fin modified as an intromittent organ Vera Cruz Subject Xiphophorus Tag Fish 1907 Cite book Fishes Jordan David Starr New York City NY Henry Holt and Company 1907 Fig 329 Creator David Starr Jordan PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 51866 Images from the Freshwater and Marine Image Bank to check David Starr Jordan Xiphophorus hellerii |