The present invention relates to heterocyclic carboxylic acid derivatives of the formula (I) below ##STR00001## to a process for their preparation, to the use of the heterocyclic carboxylic acid derivatives according to the invention for controlling animal pests and/or phytopathogenic harmful fungi, to methods and compositions for controlling animal pests and/or phytopathogenic harmful fungi in and/or on plants or in and/or on seed of plants, to processes for preparing such compositions and to treated seed and also to the use thereof for controlling pests and/or phytopathogenic harmful fungi in agriculture, horticulture and forestry, in animal health, in the protection of materials and in the domestic and hygiene field.