Metasoma
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The metasoma is the posterior part of the body, or tagma, of arthropods whose body is composed of three parts, the other two being the prosoma and the mesosoma. In insects, it contains most of the dig
The metasoma is clearly visible on this ant: it is the posterior section, including the petiole.
Scorpion
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Scorpions are predatory arachnids with eight legs, a pair of grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always ending with a sting
Fossil of Palaeophonus nuncius, a Silurian scorpion from Sweden
Ventral view: the pectines have a comblike structure in an inverted V shape.
Stinger of an Arizona bark scorpion