Placodermi

Translingual thumb|†Dunkleosteus terrelli species restoration Etymology mul la-new -, from mul grc - stem of grc πλάξ something broad or flat + grc δέρμα skin. Proper noun † class infraphylum Gnathostomata placoderms, extinct armored fish that lived from the Silurian to the Devonian periods Usage notes A paraphyletic group, likely to remain useful for fossils. Hypernyms class ; Vertebrata subphylum - subphylum; Gnathostomata - infraphylum Hyponyms class †Antiarchi order, †Arthrodira order, †Brindabellaspida order, †Petalichthyida order, †Phyllolepida order, †Ptyctodontida order, †Rhenanida order, †Acanthothoraci order, †Pseudopetalichthyida order, †Stensioellida order - orders References 34249 1 mul Fish