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Mitochondrial genomes offer pragmatic genetic markers to reconstruct evolutionary relationships and inform taxonomic classifications. Here, we present complete mitochondrial sequences for four Chinese pygmy grasshoppers (Tetrigidae), aiming to reevaluate phylogenetic patterns and morphological taxonomy. Our 17,643 bp, 16,274 bp, 15,086 bp, and 15,398 bp mitogenomes of <i>Exothotettix guangxiensis</i>, <i>Formosatettix longwangshanensis</i>, <i>Euparatettix sinufemoralis</i> and <i>Systolederus zhengi</i>, respectively, exhibit archetypal Tetrigidae architecture. We constructed phylogenies using 13 protein-coding loci from 39 Tetrigidae mitogenomes, revealing several genus-level clusters with statistically solid support, conflicts regarding <i>Ex. guangxiensis</i>, <i>F. longwangshanensis</i> merging into <i>Tetrix</i>, and two subclades of <i>Systolederus</i>. The dated divergence analysis indicates over 150 Mya of Tetrigidae ancestry, tracing the <i>Systolederus</i> generic group splits up to ~75 million years ago. Moreover, the <i>Tetrix</i> generic group radiated over 14 Mya across vast distributions, consistent with rapid adaptive dispersals. Our mitochondrial reconstructions suggest that <i>Synstolederus</i> is taxonomically overextended for a single genus, while the distinctiveness of <i>Ex. guangxiensis</i> and <i>F. longwangshanensis</i> from <i>Tetrix</i> appears questionable, and the <i>Tetrix</i> generic group comprises a potential tRNA-Ile coding region. Our integrative mitogenomic approaches will help resolve issues stemming from morphological taxonomy that is reliant on traits that are prone to convergence. This investigation enhances comprehension of Tetrigidae phylogeny and accentuates molecular systematics.