Rhachiosteus is an extinct monospecific genus of arthrodire placoderm from the Middle to Late Devonian of Germany. It is known only from a single specimen, which may be a larval or juvenile form, as the skull of said specimen is only 19 millimetres long.[1]
Rhachiosteus is a basal member of the clade Pachyosteomorphi, the sister taxon to Coccosteomorphi, which together are the two main sub-clades of Eubrachythoraci. The cladogram below shows the phylogeny of Rhachiosteus:[2]
Millerosteus minor
Coccosteus cuspidatus
Dickosteus threiplandi
Watsonosteus fletti
Protitanichthys rockportensis
Plourdosteus canadensis
Panxiosteus ocullus
Janiosteus timanicus
Harrytoombsia elegans
Torosteus tuberculatus
Torosteus pulchellus
Mcnamaraspis kaprios
Compagopiscis croucheri
Trematosteus fontanellus
Incisoscutum ritchiei
Incisoscutum sarahae
Rolfosteus canningensis
Tubonasus lennardensis
Fallacosteus turneri
Camuropiscis laidlawi
Latocamurus coulthardi
Rhachiosteus pterygiatus
Eastmanosteus calliaspis
Eastmanosteus pustulosus
Kiangyousteus yohii
Golshanichthys asiatica
Westralichthys uwagedensis
Dunkleosteus raveri
Dunkleosteus terrelli
Dunkleosteus amblyodoratus
Heterosteus ingens
Yinosteus major
Tapinosteus heintzi
Bullerichthys fascidens
Kendrickichthys cavernosus
Bruntonichthys multidens
Dinichthys herzeri
Hadrosteus rapax
Gorgonichthys clarki
Heintzichthys gouldii
Pachyosteus bulla
Gymnotrachelus hydei
Stenosteus angustopectus
Brachyosteus dietrichi
Melanosteus occitanus
Rhinosteus parvulus
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