btw, dont answer something if u dont know how to answer it. A turtle's taxonomy is how it is classed. It is in the kingdom of amphibians. The phylum of chordata. The class of reptilia. The order of tustudines. The family of Cheloniidae, which are sea turtles with shells covered with scutes (horny plates).t is in the kingdom of amphibians. The phylum of chordata. The class of reptilia. The order of tustudines. The family of Cheloniidae, which are sea turtles with shells covered with scutes (horny plates).