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About: Ptyctodontida     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPlacoderms, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: animalyago:Animal100015388yago:AquaticVertebrate101473806yago:Chordate101466257yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930yago:Placoderm101480106insectyago:Vertebrate101471682yago:Whole100003553yago:WikicatPlacoderms New Facet based on Instances of this Class

The ptyctodontids ("folded-teeth") are placoderms of the order Ptyctodontida, containing the family Ptyctodontidae. With their big heads, big eyes, reduced armor and long bodies, the ptyctodontids bore a superficial resemblance to modern day chimaeras (Holocephali). Their armor was reduced to a pattern of small plates around the head and neck. Like the extinct and related acanthothoracids, and the living and unrelated holocephalians, most of the ptyctodontids are thought to have lived near the sea bottom and preyed on shellfish.