A　dynamic　extended　isogeometric　analysis　(XIGA)　is　developed　for　transient　fracture　of　cracked　magnetoelectroelastic　(MEE)　solids　under　coupled　electro-magneto-mechanical　loading,　taking　the　advantages　of　high　order　NURBS　basis　functions　and　enrichment　methods.　The　extended　dynamic　fracture　parameters　are　estimated　through　the　electro-magneto-mechanical　interaction　integral.　Numerical　examples　of　electrically　and　magnetically　impermeable　cracks　are　studied　to　demonstrate　the　accuracy　of　the　proposed　XIGA　and　its　ability　in　reproducing　important　phenomenological　characteristics　and　behaviors　of　transient　dynamic　cracks　in　MEE　materials.　Our　main　objective　focuses　on　the　numerical　investigations　of　transient　dynamic　cracks　computed　by　the　XIGA,　investigating　the　effects　of　some　numerical　aspects　on　the　responses,　presenting　new　numerical　results　of　dynamic　responses,　and　addressing　the　XIGA　performance.　Different　degrees　of　NURBS,　polarization,　finite　size　effects,　enrichments,　loadings,　multiple　cracks,　volume　fraction,　different　multi-phase　compositions　of　piezoelectric/piezromagnetic,　etc.　affecting　the　responses　are　investigated.　Illustration　of　scattered　elastic　waves　propagating　in　the　cracked　MEE　is　depicted　to　take　an　insight　look　at　the　behavior　of　responses.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.