Top 10 Most Oldest Animal species1. Cyanobacteria (2.8 billion years)
2. Sponge (750 million years)
3. Jellyfish (500 million years)
The 90 percentage of their body contain water. They are also known for eating other jellies. Box jellyfish of the family is the most venomous species on Earth. Their tentacles have more than 5000 stinging cells.
4. Nautilus (500 million years)
5. Horseshoe crabs (450 million years)
6. Coelacanth (360 million years)
7. Sturgeon (245 to 208 million years)
8. Horseshoe Shrimp (200 million years)
Horseshoe Shrimps. Once the pools of horseshoe shrimps get dries up the eggs remain dormant for many years. Scientist discovered special marine species in 1955.
9. Frilled shark (150 million years)
The 5 foot long frilled shark has 300 trident shaped teeth over 25 rows. Frilled shark’s strange looking mouth looks much larger than that of other species of shark.
10. Martialis heureka (120 million years)
So what you think about this list don't forget to mention :)