A 4-amino-thieno[2,3-d]-pyrimidine compound for combating or controlling insects, arachnids or nematodes of formula I: wherein X is selected from halogen, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; R 1 is selected from the group consisting of hydrogen, halogen, formyl, C 1 -C 10 -alkyl, C 1 -C 10 -alkenyl, C 1 -C 10 alkynyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -haloalkenyl, C 1 -C 10 -haloalkynyl, C 1 -C 10 -alkoxy, C 1 -C 6 -allcoxy-C 1 -C 6 -alkyl; C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio, C 1 -C 10 -haloalkylthio, C 1 -C 10 -alkylsulfiriyl, C 1 -C 10 -haloalkylsulfnyl, C 1 -C 10 -alkylsulfonyl, C 1 -C 10 -haloalkyl-sulfonyl, C 1 -C 10 -alkylamino, C 1 -C 10 -haloalkylatnino, di(C 1 -C 10 -alkyl)amino, di(C 1 -C 10)-haloalkylamino, CN, -CR 3 =NOH, -CR 3 =NOCH 3 and -CR 3 =NOC 2 H 5; R 2 is selected from the group consisting of hydrogen, halogen, C 1 -C 10 -alkyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio, C 1 -C 10 -haloalkylthio, C 1 -C 10 -alkylsulfinyl, C 1 -C 10 -haloalkylsulfinyl, C 1 -C 10 -alkylsulfonyl, C 1 -C 10 -haloalkyl-sulfonyl, C 1 -C 10 -alkylamino, C 1 -C 10 -haloalkylamino, di(C 1 -C 10 -alkyl)amino and di(C 1 -C 10)-haloalkylamino; R 3 is selected from hydrogen, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; A is wherein n is 0, 1 or 2; R 4, R 5, R 8 and R 9 are selected independently from one another from hydrogen, CN, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; R 6 is selected from the group consisting of C 1 -C 10 fluorohaloalkyl, C 2 -C 10 fluorohaloalkenyl, C 2 -C 10 fluorohaloalkinyl and C 3 -C 7 fluorolialocycloalkyl, wherein the carbon atoms of the aforementioned fluorohaloalkyl radicals may further be substituted with C 1 -C 10 -alkoxy, C 1 -C 10 -haloalkoxy, cyano and (C=O)R q, and wherein R q is selected from the group consisting of amino, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 1 -C 6 -alkylamino, C 1 -C 6 -haloalkylamino, di(C 1 -C 6 -alkyl)amino and di(C 1 -C 6)-haloalkylamino; R 7 is selected from the group consisting of hydrogen, halogen, CN, C 1 -C 10 -alkyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio and C 1 -C 10 -haloalkylthio; or an enantiomer, diastereomer or agriculturally or veterinary acceptable salt thereof. X is selected from halogen, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; R 1 is selected from the group consisting of hydrogen, halogen, formyl, C 1 -C 10 -alkyl, C 1 -C 10 -alkenyl, C 1 -C 10 alkynyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -haloalkenyl, C 1 -C 10 -haloalkynyl, C 1 -C 10 -alkoxy, C 1 -C 6 -allcoxy-C 1 -C 6 -alkyl; C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio, C 1 -C 10 -haloalkylthio, C 1 -C 10 -alkylsulfiriyl, C 1 -C 10 -haloalkylsulfnyl, C 1 -C 10 -alkylsulfonyl, C 1 -C 10 -haloalkyl-sulfonyl, C 1 -C 10 -alkylamino, C 1 -C 10 -haloalkylatnino, di(C 1 -C 10 -alkyl)amino, di(C 1 -C 10)-haloalkylamino, CN, -CR 3 =NOH, -CR 3 =NOCH 3 and -CR 3 =NOC 2 H 5; R 2 is selected from the group consisting of hydrogen, halogen, C 1 -C 10 -alkyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio, C 1 -C 10 -haloalkylthio, C 1 -C 10 -alkylsulfinyl, C 1 -C 10 -haloalkylsulfinyl, C 1 -C 10 -alkylsulfonyl, C 1 -C 10 -haloalkyl-sulfonyl, C 1 -C 10 -alkylamino, C 1 -C 10 -haloalkylamino, di(C 1 -C 10 -alkyl)amino and di(C 1 -C 10)-haloalkylamino; R 3 is selected from hydrogen, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; A is wherein n is 0, 1 or 2; R 4, R 5, R 8 and R 9 are selected independently from one another from hydrogen, CN, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; R 6 is selected from the group consisting of C 1 -C 10 fluorohaloalkyl, C 2 -C 10 fluorohaloalkenyl, C 2 -C 10 fluorohaloalkinyl and C 3 -C 7 fluorolialocycloalkyl, wherein the carbon atoms of the aforementioned fluorohaloalkyl radicals may further be substituted with C 1 -C 10 -alkoxy, C 1 -C 10 -haloalkoxy, cyano and (C=O)R q, and wherein R q is selected from the group consisting of amino, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 1 -C 6 -alkylamino, C 1 -C 6 -haloalkylamino, di(C 1 -C 6 -alkyl)amino and di(C 1 -C 6)-haloalkylamino; R 7 is selected from the group consisting of hydrogen, halogen, CN, C 1 -C 10 -alkyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio and C 1 -C 10 -haloalkylthio; or an enantiomer, diastereomer or agriculturally or veterinary acceptable salt thereof. n is 0, 1 or 2; R 4, R 5, R 8 and R 9 are selected independently from one another from hydrogen, CN, C 1 -C 10 -alkyl or C 1 -C 10 -haloalkyl; R 6 is selected from the group consisting of C 1 -C 10 fluorohaloalkyl, C 2 -C 10 fluorohaloalkenyl, C 2 -C 10 fluorohaloalkinyl and C 3 -C 7 fluorolialocycloalkyl, wherein the carbon atoms of the aforementioned fluorohaloalkyl radicals may further be substituted with C 1 -C 10 -alkoxy, C 1 -C 10 -haloalkoxy, cyano and (C=O)R q, and wherein R q is selected from the group consisting of amino, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 1 -C 6 -alkylamino, C 1 -C 6 -haloalkylamino, di(C 1 -C 6 -alkyl)amino and di(C 1 -C 6)-haloalkylamino; R 7 is selected from the group consisting of hydrogen, halogen, CN, C 1 -C 10 -alkyl, C 1 -C 10 -haloalkyl, C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 10 -haloalkoxy, C 1 -C 10 -alkylthio and C 1 -C 10 -haloalkylthio;