Nargactals

Nargactals are a species of snail-like animals which inhabit underwater caves on the Planet Delphinium, an ocean planet. They were known for being the oldest creatures in the universe in May 2018, until Coelacanths were discovered to be older. The oldest known Nargactal is Thomas (Nargactal) aged 800 Billion. Nargactals were discovered by Tomsk in 2018 and were frequently visited by him. Originally, they were believed to be the ancestors of Eternal snails. However, in August 2019, it was discovered that they evolved from Eternal snails, before evolving back into them. Eternal snails themselves evolved from an 1953-born Earth snail who had accidentally been transported black in time due to radiation. Therefore most gerontologists have discounted them from lists of the oldest animals, as they only came into existence in 1953.
Other Nargactals include:
Tharg aged 150 Billion 
Snuba aged 147 Billion 
Bikram aged 152 Billion 
Snood aged 154 Billion 
Bingle aged 161 Billion 
Falange aged 141 Billion 
Thumara aged 170 Billion
Preturia aged 181 Billion 
Kombucha aged 183 Billion 
Redo aged 190 Billion 
Droogal aged 195 Billion 
Adjuka aged 199 Billion 
Dortan ged 201 Billion 
Shubara aged 207 Billion 
Mabaraka aged 224 Billion 
Flobert aged 252 Billion 
Surtan aged 287 Billion 
Zoroasta aged 295 Billion 
Fargo aged 366 Billion 
Shurfaba aged 386 Billion 
Truro aged 442 Billion 
Sombuka aged 468 Billion 
Borbund aged 497 Billion 
Perogia aged 505 Billion 
Yugal 518 Billion
Drakshor 531 Billion 
Shadrach 532 Billion 
Xoraf aged 543 Billion 
Dragus aged 564 Billion 
Kadjuna aged 564.02 Billion 
Tengun aged 587 Billion 
Borudin aged 599 Billion 
Mafisah aged 612 Billion 
Changa aged 616 Billion 
Arutan aged 623 Billion 
Garganda aged 656 Billion 
Maruca aged 710 Billion 
Promul aged 756 Billion 
Frintan aged 749 Billion 
Tranmere aged 737 Billion 
Vale aged 707 Billion 
Jora aged 711 Billion 
Rambutan aged 710 Billion 
Rufara aged 757 Billion 
Yakori aged 767 Billion 
Drukal aged 775 Billion 
Jambal aged 786 Billion 
Taguta aged 787 Billion 
Rutleg aged 796 Billion 
Thomas aged 800 Billion