These cells are similar to the mitochondria rich cells found in teleost fish. It is only observed in reptiles and teleost fish. Such mitochondrion-rich cells are found in both the gill lamellae and filaments of teleost fish. Homologs of interferon-gamma are found in birds, frogs, and teleost fish. Also found were fossil plants, echinoderms, cephalopods, deep-sea teleost fish, and seabirds. Previous studies have also investigated sex reversal mechanisms in teleost fish. The panopsins of teleost fish are called&colon; Teleost multiple tissue (TMT) opsins. Dorsetichthys is an extinct genus of teleost fish from the Early Jurassic period of Europe. The longnose Sawshark is known to prey on small teleost fish, crustaceans, and small squids. In some teleost fish, the lips may be modified to carry sensitive barbels. Teleost fish with swim bladders have neutral buoyancy, and have no need for this lift.