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Found on
http://en.wikipedia.org/wiki/Acanthodian

Acanthodians were the earliest jawed vertebrates. These early fish (Class acanthodii) lived from the Ordovician to the Carboniferous period. Although most Acanthodians were small, averaging roughly 5-6 inches (13-15 cm) long, some were much larger (for example, the genus Xylacanthus, known from its huge jaws, is thought to have been perhaps 3 feet ...
Found on
http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
Found on
https://www.infoplease.com/dictionary/acanthodian
No exact match found.