Cephalaspis (SciiFii)

The pleco lamprey (Cephalaspis modernum, name meaning "modern head shield") is a species of osteostracan agnathan vertebrate that originally lived in what is now North America and western Europe during the Early Devonian as several extinct species of Cephalaspis, and the genus itself was once extinct, but has since been brought back from extinction by SciiFii and is now a very popular pet fish since it is very easy to keep, breed, and care for. The pleco lamprey is an average-sized fish, growing to be about the size of a trout. It does not have a jaw, so it is a detritivorous fish that primarily feeds on worms, small shellfish, and algae, sucking them into their jawless mouths utilizing water pressure. Like some other fish, the pleco lamprey tolerates saltwater, brackish waters, and freshwater, so it can be placed into any kind of waters with any species of fish and other aquatic animals that the pleco lampreys don't feed on. When breeding seasons come, the males and females mate in a manner similar to catfish, and they lay thousands of eggs at a time. Due to some pet releases, the pleco lampreys can now be found throughout the lakes, rivers, estuaries, brackish waters, and shorelines across North America and Eurasia, however, they are not invasive thanks to many predators, despite the fact that pleco lampreys are flourishing in their new ecosystems. When the female pleco lampreys living in the wild are ready to lay eggs, they head for the rivers, before jumping out of the rivers into nearby lakes to spawn there before heading back out of the spawning grounds (unlike (most) salmon, they don't die from spawning). When the eggs hatch around 3 months later, the pleco lamprey hatchlings start their lives by feasting on their main food sources. It takes about 5 months for them to become fully grown, and when they're juveniles, they jump out of the lakes they were born in and into the nearby rivers to find more food sources, and the breeding cycle repeats every year. The pleco lamprey is not in danger of re-extinction due to its fast reproduction and its ability to quickly adapt to newer, unfamiliar environments.