Acanthodii Further reading
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Acanthodii or acanthodians is an extinct class of gnathostomes (jawed fishes). They are currently considered to represent a paraphyletic grade of various...
Chondrichthyes (section Further reading)extinct (armored gnathostomes) └Eugnathostomata (true jawed vertebrates) ├─Acanthodii (stem cartilaginous fish) └─Chondrichthyes (true cartilaginous fish) ├─Holocephali...
Evolution of fish (section Further reading)fish known as placoderms, which evolved from the ostracoderms; and the Acanthodii (or spiny sharks). The jawed fish that are still extant in modern days...
Fish jaw (section Further reading)S2CID 43389789. "Placodermi: Overview". Palaeos. Retrieved 10 December 2014. "Acanthodii". Palaeos. Retrieved 10 December 2014. "More About Placoderms". Devonian...
Vertebrate paleontology (section Further reading)(chimaeras and extinct relatives) Class Placodermi (armoured fish) † Class Acanthodii ("spiny sharks", sometimes classified under bony fishes) † Class Osteichthyes...
Xenacanthida (section Further reading)†Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii †Acanthodiformes †"Climatiiformes" †Diplacanthiformes †Ischnacanthiformes...
Coelacanth (section Further reading)returned to Sulawesi in November 1997 to interview fishermen and look for further examples. A second specimen was caught by a fisherman in July 1998 and...
Thelodonti (section Further reading)three-dimensionality, ending speculations that the Thelodonts were flattened fish. Further, these fossils allowed the gut morphology to be interpreted, which generated...
Fish (section Further reading)the end-Devonian extinction wiped out the apex placoderms. Bony fish are further divided into the lobe-finned and ray-finned fish. About 96% of all living...
Fish scale (section Further reading)fishes, ganoine or ganoine-like tissues are also found on the extinct acanthodii. It has been suggested ganoine is homologous to tooth enamel in vertebrates...
Parameteoraspis reached up to 1 m (3.3 ft). The largest of the now-extinct Acanthodii was Xylacanthus grandis, an ischnacanthiform based on a ~35 cm (14 in)...- Catavi Formation (section Further reading)Burmeisteria (Digonus) cf. noticus Calymene sp. Pleurodictyum sp. Trimerus sp. Acanthodii indet. Brachiopoda indet. Bryozoa indet. Cephalopoda indet. Gastropoda...
Fish fin (section Further reading)during evolution (e.g. additional dorsal fins, adipose fin). In some †Acanthodii ("spiny sharks"), one or more pairs of "intermediate" or "prepelvic" spines...
- Selachia or Elasmobranchii (see Selachians). Orders: Pleuropterygii, Acanthodii, Ichthyotomi, Plagiostomi, Holocephali. Sub-class 3. Teleostoma. Orders: