Are Haikouichthys extinct?

Haikouichthys /ˌhaɪkuˈɪkθɪs/ is an extinct genus of craniate (animals with notochords and distinct heads) that lived 518 million years ago, during the Cambrian explosion of multicellular life.

Was Haikouichthys a fish?

Haikouichthys was a prehistoric fish, notable for being not only the very first fish, but also the oldest, most primitive known backboned animal (vertebrate).

Do Haikouichchys have jaws?

Haikouichthys have a unique structure in that they had a bony skull and lacked a jaw and so, they ate extremely tiny things present in the water and thus they were more of prey than a predator.

Why is the Haikouichthys important?

Despite their tiny size, Haikouichthys was an evolutionary giant. As some of the first, if not, the very first fish ever to evolve, they are the earliest known ancestor of humans. They were unique because rather than having armor on the outside, they were tough inside.

What are some examples of jawless fish?

HaikouichthysArandaspis prionotolepis
Jawless fish/Lower classifications

Is Haikouichthys a vertebrate?

Haikouichthys appears here as the sister-group to all other vertebrates except hagfishes, like Myllokunmingia in the analysis of ref. 5.

Are living agnathans?

The only living agnathans are lampreys and hagfishes (class Cyclostomata), which are parasites or scavengers. Fossil agnathans, covered in an armour of bony plates, are the oldest known fossil vertebrates. They have been dated from the Silurian and Devonian periods, 440–345 million years ago.

Where can Agnatha be found?

The hagfish is found in cold ocean waters in the Northern and Southern Hemispheres. It is found on muddy sea floors and may live in very large groups of up to 15,000 individuals. There are about 60 species of hagfish.

What did the Haikouichthys eat?


  • Discover in. Unknown.
  • Period. 535–520 Million Years Ago.
  • Location. China.
  • Size. Unknown.
  • Diet. Carnivore.
  • Belongs to. Craniate > Fish.