Thelodus
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| Thelodus Fossil range: Late Silurian |
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Thelodus is an extinct genus of primitive jawless fish that lived in the Silurian period.
Thelodus belonged to the Thelodonti, a group of agnathes lacking the armored plating characteristic of the related Heterostraci. The position of Thelodus`s mouth suggests it fed on the ocean floor. Despite this lifestyle it was also a good swimmer, as indicated by its elongated lower caudal lobe and stabilizing dorsal fin, anal fin and two pectoral fins.
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