Your Inner Fish
Where did the jaws of vertebrates develop?
-lampreys?
-third pharyngeal arch?
-last pharyngeal arch?
-operculum?
-claspers?
-lampreys?
-third pharyngeal arch?
-last pharyngeal arch?
-operculum?
-claspers?
I am not at all familiar with this, but the article I have linked below might help you answer your question.
http://www.cdb.riken.jp/emo/old-japanese/pubj/pdfj02/kuratani_01356.pdf