Schizorhiza (SciiFii)

The common false sawfish (Schizorhiza sciifii) is a fossil species of sawfish-like cartilaginous fish member of the subfamily, Schizorhizinae, that originally lived in the Campanian and Maastrichtian stages; between about 83.6 and 66 million years ago, and was once extinct, but has since been brought back from extinction by SciiFii and introduced to the modern seas around the Atlantic coasts of North America, Europe, and Africa to help boost biodiversity. The common false sawfish is unique among all "saw-snouted" Elasmobranchii in that its rostral teeth does not fall off as they are replaced. Rather, they remain in place, with the new teeth under them, until they are worn off. Thus, the rostrum's edge has a continuous serrated cover of tooth enamel. Full-grown rostral teeth measure less than in other Sclerorhynchoidea, let alone sawfishes, at 1–2 cm tall and 4–8 mm wide. They have a small triangular or rhomboidal shape at the tip, with sharp cutting edges, and a long forked peduncle, each lobe of which divides into four lobelets proximally. The new teeth develop inside the peduncular fork; the scientific name Schizorhiza – meaning "split root" – refers to the shape of the rostral teeth. The oral teeth are very small (about 1.5-2.5 mm high and 1–2 mm wide), with a large and recurved central point and keels at the side that form tiny secondary points. As its rostrum is well-adapted for slashing and of little use for digging, this species does not share the whip-like tail of the bottom-dwelling relative Sclerorhynchus, but apart from the peculiar rostrum looking not too different from one of the sawfishes, regardless of whether they are very close relatives or not. Its total size is generally about 1.5 meters in length. Its natural habitat is usually shallow or epicontinental seas, but has been known to live in estuaries. The conservation status of the common false sawfish is Least Concern due to successful conservation efforts, the common false sawfish's wide range, and its tolerance to most of human activities.