The jawed fish that are still extant in modern days also appeared in late Silurian: the Chondrichthyes (or cartilaginous fish) and the Osteichthyes (or bony fish).

The bony fish evolved into two separate groups: the Actinopterygii (or ray-finned fish) and Sarcopterygii (which includes the lobe-finned fish).

Fish, like many other organisms, have been greatly affected by extinction events throughout natural history.

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The Cretaceous–Paleogene extinction event, and the present day Holocene extinction, have also affected fish variety and fish stocks.

Conventional classification has living vertebrates as a subphylum grouped into eight classes based on traditional interpretations of gross anatomical and physiological traits.

It was from the lobe-finned fish that the tetrapods evolved, the four-limbed vertebrates, represented today by amphibians, mammals, reptiles and birds.

Transitional tetrapods first appeared during the early Devonian, and by the late Devonian the first tetrapods appeared.

Most jawless fish are now extinct; but the extant lampreys may approximate ancient pre-jawed fish.

Lampreys belong to the Cyclostomata, which includes the extant hagfish, and this group may have split early on from other agnathans.

It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates.

The first fish lineages belong to the Agnatha, or jawless fish. During the late Cambrian, eel-like jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared.

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