A tergum (Latin for "the back"; plural terga, associated adjective tergal) is the dorsal ('upper') portion of an arthropod segment other than the head. The anterior edge is called the base and posterior edge is called the apex or margin. A given tergum may be divided into hardened plates or sclerites commonly referred to as tergites.
In a thoracic segment, for example, the tergum may be divided into an anterior notum and a posterior scutellum. Lateral extensions of a tergite are known as paranota (Greek for "alongside the back") or carinae (Latin for "keel"), exemplified by the flat-backed millipedes of the order Polydesmida.
- McCafferty, W. Patrick (1983). Aquatic entomology: the fishermen's and ecologists' illustrated guide to insects and their relatives. Jones and Bartlett. p. 20. ISBN 9780867200171. Retrieved 2020-04-30 – via Google Books.
- Sørensen, MV; Dal Zotto, M; Rho, HS; Herranz, M; Sánchez, N; Pardos, F; Yamasaki, H (2015). "Phylogeny of Kinorhyncha based on morphology and two molecular loci". PLOS ONE. 10 (7): e0133440. Bibcode:2015PLoSO..1033440S. doi:10.1371/journal.pone.0133440. PMC 4511640. PMID 26200115.