Issued in 1964, this striking stamp from Monaco features Macrocheira kaempferi, commonly known as the Japanese spider crab. Known for having the largest leg span of any arthropod, the creature is masterfully illustrated in red against a pale background. The design credits go to artist P. Fenneteaux, after Millot’s scientific illustration. With a face value of 0.01 franc, it was part of a zoological or marine life thematic series. A distinctive and educational addition to any collection focused on marine biology or 1960s European issues.