FrancophonIA/Vikidia-EnFr huggingface dataset:
See below

Chordata is a phylum (group) of animals which have a notochord. The group includes vertebrates, with some closely related invertebrates.

Appendicularia (formerly Larvacea)

Thaliacea

Ascidiacea

Cephalochordata

Myxini

Conodonta†

Cephalaspidomorphi†

Hyperoartia

Pteraspidomorphi†

Placodermi†

Chondrichthyes

Acanthodii†

Actinopterygii

Amphibia

Mammalia

Aves

Note: Lines show likely evolutionary relationships.  Extinct groups are marked with a "†". Extinct animals are ones that have completely died out.

According to a long-standing theory, the origin of chordates may be found in transformed larvae of sea-squirts (tunicates). Adult tunicates are sessile, but their larvae are motile, and have some features found in early vertebrates.  The process of paedomorphosis, where juvenile features are retained in the adult, is the proposed mechanism.[1][2][3] Genome analysis shows that tunicates are the closest living relatives of vertebrates.[4]