Haikouichthys is one of three species of jawless (or agnathan) fish to be found in the Early Cambrian period.
Source: wiktionary
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Haikouichthys is one of three species of jawless (or agnathan) fish to be found in the Early Cambrian period.
Source: wiktionary
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
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.