Pikaia
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Pikaia gracilens is an extinct, primitive chordate marine animal known from the Middle Cambrian Burgess Shale of British Columbia. Described in 1911 by Charles Doolittle Walcott as an annelid, and in
Fossil of Pikaia gracilens (Syntype USNM PAL 57628)
Plate 20 of Walcott Cambrian Geology and Paleontology II (1911), by Charles Doolittle Walcott, showing fossils of Pikaia and Oesia
Haikouichthys
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Haikouichthys is an extinct genus of primitive jawless fish that lived during the Cambrian period, 518 million years ago, in what is now the Yunnan Province of China. Alongside Myllokunmingia and Zhon
Pikaia
…is uncharacteristic of the vertebrates, but is a dominant feature of invertebrates. The presence of earlier chordates among the Chengjiang, including Haikouichthys and Myllokunmingia, appears to show that cuticle is not necessary for preservation, overruling the taphonomic argument, but the presence of tentacles…
3D restoration