Reporter of copia element transposition. Contains a complete copy of the copia retrotransposon (flanked by P-element ends) with an EGFP cassette inserted in the antisense direction in the non-coding sequence of copia. The EGFP sequence contains a disruptive intron that can be spliced during transcription of the retrotransposon, but not during transcription of EGFP. Thus, EGFP protein is only expressed after mobilization of the copia element in the reporter transgene, which generates a new copy of copia containing EGFP without the disrupting intron.