Allochelys izanagiensis

One of my worldbuilding fauna. A filter-feeding turtle on an alternate earth where the planet is much bigger, 1 day on this planet is 7 days on Earth. These turtles have an unusual ring mouth for filter feeding though it is unknown why, having the capability to spread out the outer jaw as there are no bones at the tip to intimidate predators (evolutionarily, it is the upper jaw) These turtles live on the east coast of Japan, which has an abundant population of toxic shrimp, and the west coast. The eastern variants have evolved to take advantage of the abundance of shrimp. The western variants are not immune to the shrimp though. There are 2 species within the eastern variants. The smaller A.Izanagiensis have a broader range and live all throughout the east, being 3-4 meters long. The larger A.Fukuokaensis live in the South and South-East near the Ryuku Island Chain and grow up to 25 meters long due to the larger population of the shrimp.

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