The nautilus is considered to be a living fossil. It's remained largely unchanged for the past 500 million years, since the Triassic period. The nautilus usually inhabits ocean depths of about 300m, rising to around 100m at night only for feeding, mating or laying eggs. The average lifespan of a nautilus is around 20 years.
SUPERBLY ELEGANT FOSSIL SEA LILY Seirocrinus subangularis Lower Jurassic Posidonienschiefer Formation, Holzmaden, Baden-Württemburg, Germany The Crinoid, known also as the Sea Lily or Feather Star, is one of the world's so-called "living fossils", with species still to be found in today's oceans from Indonesia to the Caribbean.
Triadobatrachus is an extinct genus of frog-like amphibians, including only one known species, Triadobatrachus massinoti. It is the oldest member of the frog lineage known, and an excellent example of atransitional fossil. It lived during the Early Triassic about 250 million years ago, in what is now Madagascar.
endangeredanimalblog: The COELACANTH is referred to as a living fossil because it is the only remaining species of a group of fish species that died out millions of years ago. It is found in the deep coastal waters of eastern Africa, where rocky shores are battered by strong oceanic currents. A large fish, growing to a length of about 6 feet, and it moves along the rocky slopes with the help of fleshy pectoral fins. Populations are thought to be critically low.
The coelacanth has been nicknamed a “living fossil”, because its fossils were found long before the actual discovery of a live specimen. The coelacanth is thought to have first evolved approximately 400 million years ago.