Definitions

Portion of notostracan telson, usually tongue-shaped but may be spatulate to round; produced backward on dorsal side as a plate. [Moore and McCormick, 1969]
(Taxon-specific: Order Notostraca) posteriorly directed median extension of telson. (simple, bilobed; with/without median keel; median spines place on/not place on keel). [Stachowitsch, 1992]
(Taxon-specific: Order Notostraca) Tongue-shaped, spatulate, or rounded plate produced posteriorly on dorsal side of telson. [McLaughlin, 1980]
(Taxon-specific: Subclass Mystacocarida) Unpaired median projection extending from posterodorsal end of last segment (telson). Posterior end characterized by large seta (major seta) and, ventral to it, variously shaped process with minute spines. Flanked on each side by spinous process.
(syn. supra-anal process) [Stachowitsch, 1992]