Katipō Latrodectus katipo

Scientists long thought the different color forms of this New Zealand spider were actually two separate species—a textbook example of how we get fooled by cryptic diversity! The striking red-striped females from southern regions look completely different from the pale, yellow, or cream-blotched females up north, yet they're all katipō. Males are tiny—less than half the size—and display dramatic white and black striping with red hourglass marks.

Like their redback cousins, they pack potent venom capable of causing latrodectism (extreme pain, hypertension, seizures). Bites are rare and antivenom is available, but the species remains a fascinating reminder of how geography shapes spider diversity even within a single country.