▁distinct ▁to ▁be ▁in ▁their ▁own ▁family , ▁Meg ath ym idae , ▁along ▁with ▁the ▁gener a ▁Meg ath ym us ▁and ▁St all ings ia . ▁ ▁Species ▁species ▁group ▁unknown ▁Ag ath ym us ▁all iae ▁( St all ings ▁& ▁Turner , ▁ 1 9 5 7 ) ▁Ag ath ym us ▁ar y x na ▁( D yar , ▁ 1 9 0 5 ) ▁Ag ath ym us ▁bel li ▁( Fre eman , ▁ 1 9 5 5 ) ▁Ag ath ym us ▁car ls bad ensis ▁( St all ings ▁& ▁Turner , ▁ 1 9 5 7 ) ▁Ag ath ym us ▁com stock i ▁( Har b ison , ▁ 1 9 5 7 ) ▁Ag ath ym us ▁da w son i ▁Har b ison , ▁ 1 9 6 3 ▁Ag ath ym us ▁di ablo ensis ▁Fre eman , ▁ 1 9 6 2 ▁Ag ath ym us ▁es cal ante i ▁St all ings , ▁Turner ▁& ▁St all ings , ▁ 1 9 6 6 ▁Ag ath ym us ▁est elle ae ▁( St all ings ▁& ▁Turner , ▁ 1 9 5 8 ) ▁Ag ath ym us ▁ev ans i ▁( Fre eman , ▁ 1 9 5 0 ) ▁Ag ath ym us ▁field i ▁Fre eman , ▁ 1 9 6 0 ▁Ag ath ym us ▁flor ence ae ▁( St all ings ▁& ▁Turner , ▁ 1 9 5 7 ) ▁Ag ath