Haikouichthys is one of three species of jawless (or agnathan) fish to be found in the Early Cambrian period.
Source: wiktionary
Agnathan
/ˈæɡ.nə.θən/
Synonyms for "agnathan" (8 found)
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Noun(2 words)
jawless fishcyclostome
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Noun(2 words)
Related words (4)
Noun(4 words)
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12 entriesagnathan anatomyagnathan evolutionagnathan fishesagnathan fossilsagnathan lineageagnathan morphologycyclostome fishescyclostome lineagefossil agnathansjawless fishjawless fishesprimitive vertebrate
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Thus should the cranial neural crest in cyclostomes prove to be non-skeletogenous this might be a reflection either of its own primitiveness or of the different evolutionary origins and morphological status of the visceral skeleton in agnathans and gnathostomes.
Source: wiktionary
The hagfish is an agnathan, a modern representative of the earliest evolved group of vertebrates, the ostracoderms or jawless fishes, which arose prior to the ancient placoderms (3).
Source: wiktionary