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

The mesosoma is clearly visible on this ant: it is the midlle 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. It bears the legs, and, in the case of winged insects, the wings. A petiole (also called a pedicel) is the first abdominal segment of members of the Apocrita. ... In invertebrate biology, a tagma (plural tagmata) is a specialized grouping of arthropodan segments, such as head, body, and tail. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... The cephalothorax is an anatomical term used of arachnid and malacostracan arthropods for the first major body section. ... An insect leg The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. ... Classes & Orders See taxonomy Insects are invertebrate animals of the Class Insecta, the largest and (on land) most widely-distributed taxon within the phylum Arthropoda. ... 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). Superfamilies Apoidea Ceraphronoidea Chalcidoidea Chrysidoidea Cynipoidea Evanioidea Ichneumonoidea Megalyroidea Proctotrupoidea Sphecoidea Stephanoidea Triganalyoidea Vespoidea Many families, see article Apocrita is a suborder of insects in the order Hymenoptera. ... Suborders Apocrita Symphyta Many families, see article Hymenoptera is one of the larger orders of Insects, comprising the sawflies, wasps, bees, and ants. ... Suborder Symphyta Apocrita See text for families. ... Families Andrenidae Apidae Colletidae Halictidae Megachilidae Melittidae Stenotritidae Bee collecting pollen Bees (Apoidea superfamily) are flying insects, closely related to wasps and ants. ... Subfamilies Dorylomorph subfamilies Apomyrminae Cerapachyinae Dorylinae Ecitoninae Formicomorph subfamilies: Aneuretinae Dolichoderinae Formicinae - e. ... Diagram of a tsetse fly, showing the head, thorax and abdomen The thorax is a division of an animals body that lies between the head and the abdomen. ... The abdomen is a part of the body. ...

In scorpions, it is composed of six segments and forms the first part of the abdomen, containing all of the major organs. The first segment contains the sexual organs as well as a pair of vestigial and modified appendages forming a structure called the genital operculum. 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. The mesosoma is armoured with chitinous plates, on the upper surface by the tergites and on the lower surface by the sternites. Superfamilies Pseudochactoidea Buthoidea Chaeriloidea Chactoidea Iuroidea Scorpionoidea See classification for families. ... The abdomen is a part of the body. ... A sex organ, or primary sexual characteristic, narrowly defined, is any of those parts of the body (which are not always bodily organs according to the strict definition) which are involved in sexual reproduction and constitute the reproductive system in a complex organism; namely: Male: penis (notably the glans penis... A vestigial organ is an organ whose original function has been lost during evolution. ... An appendage is, in general, an external body part that projects from the body, or a natural prolongation or projection from a part of any organism. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A book lung is a rudimentary type of lung found in arachnids, such as scorpions and spiders; horseshoe crabs also posess book lungs. ... A hoplite wearing (only) a helmet, breastplate greaves and a shield. ... Structure of chitin molecule In biology, chitin (pronounced keye-tin) is one of the main components in the cell walls of fungi, the exoskeletons of insects and other arthropods, and in some other animals. ...

In other arachnids such as spiders, the mesosoma is fused with the metasoma to form the opisthosoma. Suborders Araneomorphae Mesothelae Mygalomorphae See the taxonomy section for families Spiders are invertebrate animals that produce silk, and have eight legs and no wings. ...