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Acanthodes

 Acanthodes (meaning spiny base or thorny base) is an extinct genus of spiny shark. Fossils have been found in Europe, North America, and Australia.

 Compared with other spiny sharks, Acanthodes was relatively large, at 30 centimetres (12 in) long. The genus had no teeth, instead gills. Because of this, it is presumed to have been a filter feeder, filtering plankton from the water.

 It also had fewer spines than many of its relatives. Each of the paired pectoral and pelvic fins had a spine, as did the single anal and dorsal fins, giving it a total of just six, less than half that of many other species.

 

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