The propodeum is the first abdominal segment in ApocritaHymenoptera (wasps, bees and ants). It is fused with the thorax to form the mesosoma. It is a single large sclerite, not subdivided, and bears a pair of spiracles. It is strongly constricted posteriorly to form the articulation of the petiole, and gives apocritans their distinctive shape. The abdomen is a part of the body. ... 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. ... 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... Sclerites are hardened body parts. ... Spiracles are small openings on the surface of animals that usually lead to respiratory systems. ... A petiole (also called a pedicel) is the first abdominal segment of members of the Apocrita. ...
In profile, propodeum forms a prominent, rounded convexity that is relatively distinct from the profile of the remainder of the mesosoma.
Propodeum with declivitous face decidedly longer than basal face, both faces meeting at an angle so that the propodeum in profile resembles a distinct upward facing "peak" with a more or less rounded apex (this is characteristic of the genus and is sometimes referred to as the "Lasius peak").
Minors with propodeum usually distinctly lower in elevation than pronotum; mesonotum sloping gradually (interrupted by a notch or depression at metanotal region) to the level of the propodeum or the mesonotum often as high as pronotum and separated from propodeum by a distinct step at metanotal impression.
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