# Fallacosteus

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{{Short description|Species of extinct placoderm}}
{{Automatic_taxobox
| fossil_range = [Late Devonian](/source/Late_Devonian): [Frasnian](/source/Frasnian), {{Fossil range|382.7|372.2}}
| image = Fallacosteus turnerae 1.jpg
| taxon = Fallacosteus
| authority = Long, 1990
| subdivision_ranks = Species
| subdivision =
* '''''Fallacosteus turneri''''' <small>Long, 1990</small>
}}

'''''Fallacosteus''''' is an [extinct](/source/extinct) [monospecific](/source/monospecific) [genus](/source/genus) of [arthrodire](/source/arthrodire) [placoderm](/source/placoderm) from the Early [Frasnian](/source/Frasnian) stage of the [Late Devonian](/source/Late_Devonian) period, found at the [Gogo Formation](/source/Gogo_Formation) of [Kimberley, Western Australia](/source/Kimberley_(Western_Australia)).  As with almost all other [camuropiscids](/source/Camuropiscidae), ''F. turneri'' had an elongated snout that may have enhanced its hydrodynamic streamlining.<ref name=Long1990>{{Cite journal |last1=Long |first1=J.A. |title=Two new arthrodires (placoderm fishes) from the Upper Devonian Gogo Formation, Western Australia |journal=[Memoirs of the Queensland Museum](/source/Memoirs_of_the_Queensland_Museum) |volume=28 |issue=1 |pages=51-63 |year=1990 |url=https://researchnow.flinders.edu.au/en/publications/two-new-arthrodires-placoderm-fishes-from-the-upper-devonian-gogo }}</ref><ref name=Long1996>{{Cite book |last1=Long |first1=John A. |title=The Rise of Fishes: 500 Million Years of Evolution |publisher=[The Johns Hopkins University Press](/source/The_Johns_Hopkins_University_Press) |year=1996 |isbn=0-8018-5438-5 }}</ref>

==Etymology==
The generic name translates as "deceptive bone," in reference to its extreme similarity to ''[Camuropiscis](/source/Camuropiscis)''. The specific name ''turneri'' honors Sue Turner.<ref name=Long1990/>

==Phylogeny==
''Fallacosteus'' is a member of the [family](/source/Family_(taxonomy)) [Camuropiscidae](/source/Camuropiscidae) under the [superfamily](/source/superfamily_(biology)) [Incisoscutoidea](/source/Incisoscutoidea), which belongs to the [clade](/source/clade) [Coccosteomorphi](/source/Coccosteomorphi), one of the two major clades within [Eubrachythoraci](/source/Eubrachythoraci).<ref name=Zhu2013>{{Cite journal |author1=You-An Zhu |author2=Min Zhu |title=A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci | journal=[Zoological Journal of the Linnean Society](/source/Zoological_Journal_of_the_Linnean_Society) |volume=169 |issue=4 |pages=798-819 |year=2013 |doi=10.1111/zoj12089 |doi-access=free }}</ref><ref name=Zhu2016>{{Cite journal |last1=Zhu |first1=You-An |last2=Zhu |first2=Min |last3=Wang |first3=Jun-Qing |date=1 April 2016 |title=Redescription of Yinostius major (Arthrodira: Heterostiidae) from the Lower Devonian of China, and the interrelationships of Brachythoraci |journal=[Zoological Journal of the Linnean Society](/source/Zoological_Journal_of_the_Linnean_Society) |volume=176 |issue=4 |pages=806–834 |doi=10.1111/zoj.12356|issn=0024-4082 |doi-access=free }}</ref> The [cladogram](/source/cladogram) below shows the [phylogeny](/source/phylogeny) of ''Fallacosteus'':<ref name=Zhu2016/>
{{clade| style=font-size:100%;line-height:100%
 |label1='''[Eubrachythoraci](/source/Eubrachythoraci)'''
 |1={{clade
  |label1='''[Coccosteomorphi](/source/Coccosteomorphi)'''
  |1={{clade
   |label1=[Coccosteoidea](/source/Coccosteoidea)
   |1={{clade
    |label1=[Coccosteidae](/source/Coccosteidae)
    |1={{clade
     |1={{clade
      |1=''[Millerosteus minor](/source/Millerosteus_minor)''
      |2=''[Coccosteus cuspidatus](/source/Coccosteus_cuspidatus)'' }}
     |2={{clade
      |1=''[Dickosteus threiplandi](/source/Dickosteus_threiplandi)''
      |2=''[Watsonosteus fletti](/source/Watsonosteus_fletti)''
      |3=''[Protitanichthys rockportensis](/source/Protitanichthys_rockportensis)'' }} }}
    |label2=[Panxiosteidae](/source/Panxiosteidae)
    |2={{clade
     |1=''[Plourdosteus canadensis](/source/Plourdosteus_canadensis)''
     |2=''[Panxiosteus ocullus](/source/Panxiosteus_ocullus)''
     |3=''[Janiosteus timanicus](/source/Janiosteus_timanicus)'' }} }}
   |label2='''[Incisoscutoidea](/source/Incisoscutoidea)'''
   |2={{clade
    |1=''[Harrytoombsia elegans](/source/Harrytoombsia_elegans)''
    |2={{clade
     |1=''[Torosteus tuberculatus](/source/Torosteus_tuberculatus)''
     |2=''[Torosteus pulchellus](/source/Torosteus_pulchellus)'' }}
    |3={{clade
     |1=''[Mcnamaraspis kaprios](/source/Mcnamaraspis_kaprios)''
     |2={{clade
      |1=''[Compagopiscis croucheri](/source/Compagopiscis_croucheri)''
      |2=''[Trematosteus fontanellus](/source/Trematosteus_fontanellus)''
      |label3='''[Camuropiscidae](/source/Camuropiscidae)'''
      |3={{clade
       |1={{clade
        |1=''[Incisoscutum ritchiei](/source/Incisoscutum_ritchiei)''
        |2=''[Incisoscutum sarahae](/source/Incisoscutum_sarahae)'' }}
       |2={{clade
        |1=''[Rolfosteus canningensis](/source/Rolfosteus_canningensis)''
        |2={{clade
         |1=''[Tubonasus lennardensis](/source/Tubonasus_lennardensis)''
         |2={{clade
          |1='''''Fallacosteus turneri'''''
          |2={{clade
           |1=''[Camuropiscis laidlawi](/source/Camuropiscis_laidlawi)''
           |2=''[Latocamurus coulthardi](/source/Latocamurus_coulthardi)'' }} }} }} }} }} }} }} }} }}
  |2='''[Pachyosteomorphi](/source/Pachyosteomorphi)''' }} }}

==References==
{{Reflist}}

{{Arthrodira|E.}}
{{Taxonbar|from=Q5432185}}

Category:Camuropiscidae

{{Placoderm-stub}}

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Adapted from the Wikipedia article [Fallacosteus](https://en.wikipedia.org/wiki/Fallacosteus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Fallacosteus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.