quartus, Apogon Fraser [T. H.] 2000:250, Fig. 1 [Proceedings of the Biological Society of Washington v. 113 (no. 1); ref. 24412] Saya de Malha Bank, Indian Ocean, 11°05'00"S, 62°02'00"E. Holotype (unique): USNM 307688. Combined with a feminine genus, the adjective should be quarta. •Valid as Jaydia quartus (Fraser 2000) -- (Mabuchi et al. 2014:202 [ref. 33426], Fraser & Prokofiev 2016:239 [ref. 34742], Kuiter & Kozawa 2019:170 [ref. 36965], Fraser et al. 2022:215 [ref. 39752]). •Valid as Jaydia quarta (Fraser 2000). Current status: Valid as Jaydia quarta (Fraser 2000). Apogonidae: Apogoninae. Distribution: Western Indian Ocean: Saya de Malha Bank endemic. Habitat: marine.