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#dimetrodon #pelycosaur #sailback #early synapsid #mammal-like reptile

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#dimetrodon #synapsid dominance #pelycosaur #reptile age #permian period #paleozoic life

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#sail shape #synapsid #prehistoric animal #pelycosaur #permian reptile

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#thermoregulation #sail back function #prehistoric reptile #pelycosaur #synapsid