Macromerion is an extinct genus of non-mammalian synapsids in the family Sphenacodontidae from Late Carboniferous deposits in the Czech Republic. It was named as a species of Labyrinthodon in 1875 and as its own genus in 1879. See also List of pelycosaurs References Sphenacodontidae Prehistoric synapsid genera Carboniferous synapsids Prehistoric synapsids of Europe Fossil taxa described in 1879