Kalmar "Pelycosaur" tana nufin wani ɓoyayyen rukuni na dabbobi masu rarrafe waɗanda suka rayu a zamanin Paleozoic, musamman a lokacin Permian. Ana siffanta su da tsayin tsayinsu, irin tsarin tafiyar ruwa a bayansu, waɗanda galibi ana amfani dasu don daidaita yanayin zafi da dalilai na nuni. An yi imani da cewa Pelycosaurs su ne kakannin dabbobi masu shayarwa na zamani.
