- References
{{Taxobox
| fossil_range = Late Devonian
| regnum = Animalia
| phylum = Chordata
| subphylum = Vertebrata
| classis = Placodermi
| ordo = Arthrodira
| familia = Dunkleosteidae
| genus = Holdenius
}}{{portal|Paleontology}}Holdenius is an extinct genus of arthrodire placoderm fish which lived during the Late Devonian period. References {{Dunkleosteidae}}{{Taxonbar|from=Q5879588}}{{Devonian-fish-stub}}{{Placoderm-stub}} 3 : Arthrodire genera|Placoderms of North America|Late Devonian animals |