We briefly described the morphology and transmission pathway of a Spiroplasma sp. isolated from the field cricket, Gryllus bimaculatus in Taiwan, followed by the phylogenetic analysis based on the 16S rRNA gene sequence. The cricket spiroplasma infected the hemolymph, gut, muscle tissues and tracheal cells; therefore we suggest that the pathogen invaded tissues and organs from the hemolymph through the tracheal system and the endoplasmic reticular system. Based on 16S rRNA gene sequences and the phylogeny, this spiroplasma was most closely related to Spiroplasma platyhelix (Identity=95%) isolated from the dragonfly Pachydiplax longipennis and belongs to the Ixodetis clade.
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