List of Transitional Fossils - Invertebrates To Fish

Invertebrates To Fish

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The Invertebrates → Fish Evolutionary Series
Appearance Taxa Relationships Status Description Image
??? Ma

Genus:

  • Pikaia
 Lancelet-like in appearance. Oldest known ancestor of modern vertebrates

Vertebrate characters

  • Very primitive proto-notochord.

??? Ma

Class:

  • Conodont
 Had fin rays, chevron-shaped muscles and a notochord.
530 Ma

Genus:

  • Haikouichthys
 Appears to have a cranium, thus being a craniat.
480 to 470 Ma

Genus:

  • Arandaspis
 Jawless fish A well armoured jawless fish, resembling a large tadpole in life
??? Ma

Genus:

  • Birkenia
 An anaspid, ancestral to the jawed vertebrates, An unarmored, scaly jawless fish
419 Ma

Genus:

  • Guiyu
 Oldest known bony fish

Read more about this topic:  List Of Transitional Fossils

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    —Curtis Siodmak (1902–1988)