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n.1.(Zool.) A median elevation behind the mouth in the arthropods.
References in periodicals archive ?
cephalothorax, metastoma, joints between metasoma and the base of telson) of each scorpion species, to determine the best site for current application for venom extraction.
Stiffness of joints between metastoma (in all species under study) was observed when current of more than 30V was applied or repeatedly applied for 5 seconds with five minutes interval (more than 4-5 times, within an hour).