postnotum
From ZooTerms (Dictionary of Invertebrate Zoology)
Arthropoda: Insecta) The phragma-bearing plate in the dorsum of a pterothoracic segment, originating from the acrotergite of the following notum
postnotum (noun; plural -ta; Latin post, after; Greek notum, back): (
See also: mesopostnotum, metapostnotum.