Hypopleuron Smith [H. M.] & Radcliffe [L.] in Radcliffe 1913:164 Neut. Hypopleuron caninum Smith & Radcliffe 1913. Type by original designation (also monotypic). •Valid as Hypopleuron Smith & Radcliffe 1913 -- (Cohen & Nielsen 1978:33 [ref. 881], Paxton et al. 1989:312 [ref. 12442], Cohen et al. 1991:126 [ref. 19146], Nielsen & Cohen in Nielsen et al. 1999:49, 70 [ref. 24448], Nielsen 1999:1981 [ref. 24753], Hoese et al. 2006:561 [ref. 29051], Carnevale & Johnson 2015:778 [ref. 34391], Wong & Chen 2024:10 [ref. 41401] in Carapidae). Current status: Valid as Hypopleuron Smith & Radcliffe 1913. Carapidae: Hypopleuroninae.