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bruh
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Yunnanozoon (6 pts)
Low Cambrian
Phylum Chordata
Earliest (first) Chordate
Head not well-defined
Chengjiang fauna
Leech-like

Pikaia (6 pts)
Mid Cambrian
Phylum Chordata
Burgess Shale
Small, long body (5 cm)
Tentacles for feeding and gills behind mouth
Head not well defined

Cheungkongella (4 pts)
Low Cambrian
First tunicate
Chengjiang fauna
Knew about spicules before this (what?)

Clydagnathus (4 pts)
Low Carboniferous
Phylum Condonta
Had a head
Chewing apparatus
