Thelodus is an extinct genus of primitive jawless fish that lived in the Silurian period. Fossils have been found worldwide. Thelodus belonged to the Thelodonti, a group of jawless fish lacking the armored plating characteristic of the related Heterostraci. The position of Thelodus`s mouth suggests that it fed on the ocean floor. Despite this life...
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http://en.wikipedia.org/wiki/Thelodus
(from the article `ostracoderm`) Possibly related to the Heterostraci were Thelodus and other genera, in which no plates or large scales were present; instead, the whole body was ...
Found on
http://www.britannica.com/eb/a-z/t/34
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