Classification of Rohr et al. 2003
G. †Murchisonia d'Archiac and de Verneuil 1841
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†Murchisonia chlupaci HornĂ½ 1953
†Murchisonia concinnus HornĂ½ 1952
Superfm. †Murchisonioidea Koken 1896
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Fm. †Murchisoniidae Koken 1896
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G. †Medfracaulus Rohr et al. 2003
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†Medfracaulus contracta Perner 1907
†Medfracaulus cooki Rohr et al. 2003