Noun
mesosoma (plural mesosomas)
English Wikipedia has an article on:mesosomaWikipedia
(zoology) The middle part of the body, or tagma, of arthropods whose body is composed of three parts (the other two being the prosoma and the metasoma), bearing the legs and (in winged insects) the wings.
The petiole forms a narrow waist between their mesosoma ( thorax plus the first abdominal segment, which is fused to it) and gaster (abdomen less the abdominal segments in the petiole). Source: Internet
The mouth is between segments two and three. citation The opisthosoma consists of twelve or fewer segments that originally formed two groups, a mesosoma of seven segments and a metasoma of five, terminating with a telson or spike. Source: Internet
The body of a scorpion is divided into two parts ( tagmata ): the head ( cephalothorax ) and the abdomen ( opisthosoma ), which is subdivided into a broad anterior ( mesosoma ), or preabdomen, and a narrow taillike posterior ( metasoma ), or postabdomen. Source: Internet