* Coelacanth: This lobe-finned fish was thought to be extinct for millions of years, but a living specimen was discovered in 1938. Its fossils are remarkably similar to modern coelacanths, dating back to the Devonian period (around 400 million years ago).
* Tuatara: This reptile is found only in New Zealand. It has remained virtually unchanged for over 200 million years and is the only surviving member of its ancient order.
* Horseshoe Crab: These marine arthropods have been around for over 450 million years. While they have undergone some evolutionary changes, their basic body plan has remained remarkably consistent.
* Nautilus: This cephalopod, with its distinctive coiled shell, has existed for over 500 million years. While the species have changed somewhat over time, their fundamental structure has remained largely unchanged.
It's important to note that even organisms with relatively stable fossil records have undergone some evolutionary changes over millions of years. The concept of a "living fossil" is often used to illustrate how certain lineages have been able to maintain successful adaptations for extended periods.
