Heintzosteus

Heintzosteus is an extinct genus of placoderm arthrodire fish,^[1] which lived during the Late Devonian period in Spitsbergen, Norway.^{[citation needed]}

Heintzosteus Temporal range: Late Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Placodermi
Order:	†Arthrodira
Clade:	†Phlyctaenioidei
Family:	†Arctolepididae
Genus:	†Heintzosteus Goujet, 1984
Type species
†Heintzosteus brevis (Heintz, 1929)
Synonyms
Arctolepis brevis Heintz, 1929

Within Arthrodira, Heintzosteus is considered a member of "Phylctaenii", a paraphyletic grouping within the clade Phlyctaenioidei, basal to the suborder Brachythoraci. Heintzosteus is most closely related to Arctolepis and Dicksonosteus.^[2]