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Holoptychius
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<p><i>Holoptychius</i> is an <a href="/facts/Extinction/24p5NP2q">extinct</a> <a href="/facts/Genus/m8EFjSms">genus</a> of <a href="/facts/Porolepiform/d8r3f8M9">porolepiform</a> <a href="/facts/Lobe-finned_fish/7Glajr07">lobe-finned fish</a> from the <a href="/facts/Middle_Devonian/nWgakqzk">Middle Devonian</a> to <a href="/facts/Carboniferous/BRKlkYyd">Carboniferous</a> (<a href="/facts/Mississippian_(geology)/tqsS6Ifj">Mississippian</a>) periods. It is known from <a href="/facts/Fossil/by7NzIA1">fossils</a> worldwide. The genus was first described by <a href="/facts/Louis_Agassiz/W3DJ3zFN">Louis Agassiz</a> in 1839. </p>