 They are also the last living members of the seafaring category of marine reptiles that have been in existence on Earth for at least the past 100 million years.They are also highly significant to multiple cultures and are also popular animals in tourism, which gives a higher importance to their conservation.Below is a cladogram showing the phylogenetic relationships of living and extinct sea turtles in the family Cheloniidae based on Lynch and Parham (2003) and Parham and Pyenson (2010).