• DOI:10.2108/zsj.25.1045
Corpus ID: 5983614

Early Jawless Vertebrates and Cyclostome Origins

@inproceedings{Janvier2008EarlyJV,
  title={Early Jawless Vertebrates and Cyclostome Origins},
  author={P. Janvier},
  booktitle={Zoological science},
  year={2008}
}

P. Janvier

Published in Zoological science 2008

Biology, Medicine

Abstract Undoubted fossil lampreys are recorded since the Late Devonian (358 Ma), and probable fossil hagfishes since the Late Carboniferous (300 Ma), but molecular clock data suggest a much earlier divergence times for the two groups. In the early 20th century, hagfishes and lampreys were generally thought to have diverged much later from unknown ancestral cyclostomes, in turn derived through ‘degeneracy’ from some Paleozoic armored jawless vertebrates, or ‘ostracoderms.’ However, current… CONTINUE READING

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