concavocephalus, Siganus Paradice [W. E. J.] in Paradice & Whitley 1927:99, Pl. 12 (fig. 2) [Memoirs of the Queensland Museum v. 9 (pt 1); ref. 15810] Sir Edward Pellew Islands, Gulf of Carpentaria, Northern Territory, Australia. Holotype: AMS IA.2553. Paratypes: AMS IA.2554 (2). •Incertae sedis in Siganidae -- (Allen et al. 2006:1728 [ref. 29090]). •Questionably a synonym of Siganis canaliculatus (Park 1797) or Siganus fuscescens (Houttuyn 1782) -- (Larson et al. 2013:212 [ref. 32988]). •Questionably a synonym of Siganus fuscescens (Houttuyn 1782) -- (Woodland 1990:55, 60 [ref. 19220]. Kottelat 2013:441 [ref. 32989]). Current status: Uncertain as Siganus fuscescens (Houttuyn 1782). Siganidae. Habitat: marine.