The ptyctodontids ("folded-teeth") are placoderms of the order Ptyctodontida, containing the family Ptyctodontidae. With their big heads, big eyes, reduced...

eyes were vestigial and that the phyllolepids may have been blind. Ptyctodontida ("folded teeth") were lightly armoured placoderms with big heads, big...

†Arthrodira †Ptyctodontida...

of prehistoric cartilaginous fish List of chimaeras Acanthothoraci Ptyctodontida Froese, Rainer, and Daniel Pauly, eds. (2014). "Chimaeriformes" in FishBase...

†Antiarchi †Arthrodira †Brindabellaspida †Petalichthyida †Phyllolepida †Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii...

†Antiarchi †Arthrodira †Brindabellaspida †Petalichthyida †Phyllolepida †Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii...

placement, Holoptychius's pectoral fins were placed high on the body. Ptyctodontida The ptyctodontids (beak-teeth) are an extinct monotypic order of unarmored...

†Antiarchi †Arthrodira †Brindabellaspida †Petalichthyida †Phyllolepida †Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii...

†Antiarchi †Arthrodira †Brindabellaspida †Petalichthyida †Phyllolepida †Ptyctodontida †Rhenanida †Acanthothoraci †Pseudopetalichthyida? †Stensioellida? †Acanthodii...

placoderm lineages: Acanthothoraci, Rhenanida, Antiarchi, Petalichthyidae, Ptyctodontida and Arthrodira. Spiny sharks, class Acanthodii, are extinct fish that...