The first species appeared during the Silurian period, and representatives of the family have continued to the present tin*.
Wariyaha gaarka ah ee Madaxweynaha ee hore Siilaanyo ugu warrami jiray iyo wariyihii Madaxweynaha xilligii musharraxnimada ayaa la sheegay in ay booska isku qabsadeen laakiin, haatan xaal mastuur lagu heshiisiyay.*