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Toxoprion
''Toxoprion lecontei'' (Ancient Greek for "bow saw") is an extinct eugeneodont Holocephalid whose fossils are found in marine strata from the Early Carboniferous until the Late Permian. It was one of the many Carboniferous eugeneodonts which bore a palatoquadrate fused to its skull or reduced in other forms, and had its heavily serrated teeth grow outwards on the symphysis of the lower jaw similar to a rounded saw. Despite its jaw showing similarities to another eugeneodont Genus, Helicoprion, the teeth of ''Toxoprion'' do not grow into a "whorl", in which smaller and earlier teeth are overlapped with larger teeth grown later in life, to where the jaw resembles the shell of an ammonite. As with other helicoprionids, the ''Toxoprion'' jaw instead adds teeth to the terminal end of the jaw and grows in a downward arch, not revolving around preceding teeth.
==Taxonomy==
The genus acquired its name from the greek word "τόξο" (tóxo), from the bow shaped jaw on which the teeth of the creature was arranged upon, and "πριόνι" (prióni), for the amount of triangular serrated teeth it had. While originally suggested to be a member of the genus ''Helicoprion'', it was shown to be biologically different creature and then placed in its own genus instead.〔(【引用サイトリンク】url=http://www.geocities.jp/neosymmorium/helicoprion.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Toxoprion」の詳細全文を読む
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