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Many pygmy grasshopper species exhibit colour-marking polymorphism. However, this polymorphism in some species, such as    Tetrix   bolivari   , is almost unknown. The aim of this work is to identify using DNA barcoding the colour-marking polymorphic morphs of this pygmy grasshopper species collected from both grass and sand microhabitats. Analysis by NJ clustering and pairwise distances indicated that all specimens collected showing colour-marking polymorphism are species of    T.   bolivari   . Haplotype network construction showed ten different haplotypes from a total of 57    T.   bolivari    individuals with H1(82.5%) being the most common type and it also displayed low divergence within    T.   bolivari    population. The haplotype analyses were consistent with the NJ clustering. Our field census showed the frequency of    T.   bolivari    morphs differed significantly, with the rank order of morphs (from high to low) typeA 1 , type B 1 , type A 2 , type A 3 , type A 4 , type A 5 , type A 6 , type A 7 , type B 2 , type B 3 , and type B 4 . The most common type A morphs were without contrasting markings, while the rarer type B morphs have contrasting white markings. We suggest that type B morphs have greater camouflage effects against natural backgrounds such as grass or sand than type A morphs. Both our field census and haplotype analysis revealed that type A has higher frequency and more haplotypes than type B.

DNA barcoding reveals polymorphism in the pygmy grasshopper Tetrix bolivari ( Orthoptera , Tetrigidae )