ANAL SPINE(S)
Single row of spines on either side of cladoceran postabdomen (e.g., Sididae, Holopedidae, Daphniidae). (In addition, some cladocerans possess lateral spines (e.g., Macrothricidae, Chydoridae).) [Moore and McCormick, 1969].
Single row of spines on either side of postabdomen (cladocera) or prominent telsonal spines (Conchostraca) [McLaughlin, 1980].
(Order Cladocera):
One in a series of spines along (morphological) dorsal surface of postabdomen. (Syn. anal tooth) [Stachowitsch, 1992].
(Order Diplostraca):
One of two blade-like, serrate spines projecting from posterodorsal end of telson [Stachowitsch, 1992].