Scorpion anatomy: 1 = Prosoma; 2 = Mesosoma; 3 = Metasoma

The mesosoma is clearly visible on this ant: it is the middle section, in between the head and the petiole

The mesosoma is 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. In Entomology, the term petiole is most commonly used to refer to the constricted first (and sometimes second Metasomal segment of members of the Hymenopteran In Invertebrate Biology, a tagma (plural tagmata) is a specialized grouping of Arthropodan segments such as the Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " The cephalothorax (call prosoma in some groups is an anatomical term used in Arachnids and Malacostracan Crustaceans for the 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 It bears the legs, and, in the case of winged insects, the wings. The arthropod leg is a form of jointed Appendage of Arthropods usually used for Walking. Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Insect wings are outgrowths of the Insect Exoskeleton that enable insects to fly.

In Apocrita Hymenoptera (wasps, bees and ants), it consists of the three thoracic segments and the first abdominal segment (the propodeum). Hymenoptera is one of the larger orders of Insects comprising the sawflies, Wasps Bees and Ants The name refers to A wasp is any Insect of the order Hymenoptera and suborder Apocrita that is neither a Bee nor Ant. Bees are flying Insects closely related to Wasps and Ants Bees are a Monophyletic lineage within the superfamily Apoidea Ants are social Insects of the family Formicidae and along with the related families of Wasps and Bees belong to the order The thorax is a division of an Animal 's body that lies between the head and the Abdomen. In Vertebrates such as Mammals the abdomen (belly constitutes the part of the body between the Thorax (chest and Pelvis. The propodeum is the first abdominal segment in Apocrita Hymenoptera ( Wasps Bees and Ants. For historical reasons, in ants it is commonly referred to by the alternative name alitrunk. [1][2][3]

In scorpions, it is composed of six segments and forms the first part of the abdomen, containing all of the major organs. Scorpions are eight-legged Carnivorous Arthropods They are members of the order Scorpiones within the class Arachnida. In Vertebrates such as Mammals the abdomen (belly constitutes the part of the body between the Thorax (chest and Pelvis. The first segment contains the sexual organs as well as a pair of vestigial and modified appendages forming a structure called the genital operculum. A sex organ, or primary sexual characteristic, as narrowly defined is any of the anatomical parts of the body which are involved in sexual reproduction and constitute Vestigiality describes homologous characters of Organisms which have lost all or most of their original function in a species through An appendage in the broadest sense is an additional or subsidiary part existing on or added to something which can generally still function if the appendage has never existed or The second segment bears a pair of featherlike sensory organs known as the pectines; the final four segments each contain a pair of book lungs. A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument A book lung is a type of Respiration organ used for atmospheric gas exchange and is found in Arachnids such as Scorpions and Spiders Each of these The mesosoma is armoured with chitinous plates, on the upper surface by the tergites and on the lower surface by the sternites. Armour (or armor) is protective covering most commonly manufactured from metals to prevent damage from being inflicted to an individual or a vehicle through use of direct contact Chitin ( C 8 H 13 O 5 N)n (ˈkaɪtən is a long-chain Polymer of a N-acetylglucosamine A tergum (plural terga, associated adjective tergal) is the dorsal portion of an Arthropod segment other than the head The sternum (pl "sterna" is the Ventral portion of a segment of an Arthropod Thorax or Abdomen.

In other arachnids such as spiders, the mesosoma is fused with the metasoma to form the opisthosoma. Spiders are Predatory Invertebrate Animals that have two body segments, eight legs no chewing mouth parts and no wings 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 The opisthosoma is the posterior portion of the Arachnids body behind the Prosoma (cephalothorax

References

• Charles A. Triplehorn, Norman F. Johnson (2005) Borror and DeLong's introduction to the study of insects, 7th edition, Thomson Brooks/Cole.