In 1894, Jose Rizal sent (from Dapitan) to Möllendorff (who was in Manila at that time) specimens of large sea snails know as tun shells together with some specimens of a species of small freshwater snails stored in glass vials.
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The species of small snails was later named Oncomelania quadrasi by Möllendorff in 1895 after Don José Florencio Quadras, a Spanish malacologist who was also based in Manila at that time.
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