| image = Acanthodes BW.jpg | image_width = 250px | image_caption = Acanthodes bronni | regnum = Animalia | phylum = Chordata | subphylum = Vertebrata | infraphylum = Gnathostomata | classis = Acanthodii | subdivision_ranks = Orders | subdivision = Climatiiformes Ischnacanthiformes Acanthodiformes }} Acanthodii (sometimes called spiny sharks)'s a class of extinct fishes, having features of both bony fish (Osteichthyes) and cartilaginous fish (Chondrichthyes). In form they resembled sharks, but… (More on Acanthodii)