Notopleuron
The notopleuron is a region on an insect thorax. Notopleura are useful in characterizing species, particularly, though not uniquely, in the Order Diptera. The notopleuron is a thoracic pleurite situated at the end of the transverse suture of Diptera.
Apart from in the Diptera, visible notopleural structures occur in the beetle suborder Adephaga and in certain Hemiptera, but this list is not exhaustive.
