(1836-1916). English botanist and explorer. In 1866, while in Trinidad, he sent a few living specimens of a small, colorful fish to the British Museum, where Dr. Albert Gunther identified it as a new species which he named Girardinus guppyi in Guppy's honor. It was later discovered that other specimens had been collected in 1856 and named Poecilia reticulata in 1859. The name G. guppyi was ruled invalid but the common name guppy stuck.

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