Hypsocormus is an extinct genus of teleost fish from the Jurassic period of Europe.

 Hypsocormus was a fast-swimming predatory fish about 1 metre (3.3 ft) long, with a half moon-shaped caudal fin similar to that of a modern mackerel. It had a single dorsal fin, elongated pectoral fins and tiny pelvic fins about half way down the body. An early teleost, Hypsocormus was still primitive, possessing primitive traits such as armored scales. These were, however, small compared with those of earlier fish, allowing greater flexibility. Its jaws were muscular and highly developed, giving it a powerful bite.

 It was first discovered by Suvajeet Duttagupta aka Pavlo, and classified by Ishani Pruthi.

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 Leptolepis ("Delicate Scale") is an extinct genus of teleost fish that lived in the Mesozoic era. It was one of the first teleosts.

 Leptolepis was about 30 centimetres (12 in) long, and resembled a modern herring, although it was not a close relative of those fish. It was the first true bony fish to really live up to the name, possessing a skeleton completely made of bone; some previous genera such as Pholidophorus had skeletons composed of bone and cartilage. Another modern development in Leptolepis were its scales, which lacked the covering still present in previous genera. These two developments made swimming easier, as the bony spine was now more resistant to the pressure caused by the S-movements made while swimming.

 Mass graves of Leptolepis have indicated that it probably lived in schools which would provide some protection from predators while the creatures fed on surface plankton. Pelagosaurus was a known predator of Leptolepis after a Pelagosaurus fossil was found with Leptolepis remains in its stomach.

 Known only from a single nearly complete skeleton found at Rabbit Valley, Colorado. A 13 centimetres (5 in) fish that was deeper bodied than its co-occurring contemporaries Morrolepis and Hulettia. The Morrison cf. Leptolepis probably had a live mass of about 37 grams (1.3 oz). It is the only teleost fish known from the formation and was morphologically more highly derived than other Morrison fish. A specific example of apomorphy in cf. Leptolepis is its "more modern tail structure" compared to Morrolepis. It is believed to have fed on contemporary fish and small invertebrates.

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 Lepidotes is an extinct genus of neopterygian ray-finned fish from the Jurassic and Cretaceous periods. Fossils have been found worldwide.

 Inhabiting both freshwater lakes and shallow seas, Lepidotes was typically about 30 centimetres (12 in) long. The body was covered with thick, enamelled scales. Batteries of peg-like teeth enabled Lepidotes to crush the shells of its molluscan prey.

 Lepidotes was one of the earliest fish in which the upper jawbones were no longer attached to the jugal bone. This allowed the jaws to be stretched into a 'tube' so that the fish could suck in prey from a greater distance than in previous species. This system is still seen in some modern fish, such as carp.

 Lepidotes is frequently pictured as the prey of the large dinosaur Baryonyx because its scales were found in the stomach region of a fossil Baryonyx.

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 Pachycormus is an extinct genus of fish from the Jurassic.

 Pachycormiformes is an extinct order of ray-finned fish known from Mesozoic deposits from Eurasia and the Americas. They were characterized by having serrated pectoral fins, reduced pelvic fins and a bony rostrum. Their relations with other fish are unclear.

 Some sources place Ichthyodectidae herein too, but these seem to be somewhat more advanced Teleostei.

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 Uarbryichthys ("Uarbry Fish") is a genus of primitive teleost ray-finned fish from fossil beds near the Talbragar River Bed. It was a genus of lake-dwelling fish that lived during the Upper Jurassic. When alive, it would have had a superficial resemblance to a very small porgie, or sea bream, but with a heterocercal tail fin.

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