guentheri, Mastacembelus Day [F.] 1865:37 [Proceedings of the Zoological Society of London 1865 (pt 1) (art. 1); ref. 17367] Cochin, India. Syntypes and/or Day specimens: AMS B.8048 (1, non-type); BMNH 1865.7.17.26-27 (2) Malabar, 1975.9.30.24 (1, dry); ZSI 2150 (1, figured specimen), 2993 (1, lost). Type catalog: Whitehead & Talwar 1976:162 [ref. 23762], Ferraris et al. 2000:297 [ref. 25110]. Also appeared in Day 1865:154, Pl. 11 [ref. 1074]. Reasons for loss of ZSI type specimens during WWII see Chopra 1947:349-350 [ref. 33077]. •Questionably a synonym of Mastacembelus maculatus Cuvier 1832 -- (Roberts 1989:181 [ref. 6439]). •Synonym of Macrognathus malabaricus (Jerdon 1849) -- (Menon 1999:302 [ref. 24904]). •Valid as Mastacembelus guentheri Day 1865 -- (Indra 1993:190 [ref. 24009] as Mastocembelus guntheri). •Valid as Macrognathus guentheri (Day 1865) -- (Travers 1984:144 [ref. 5147], Talwar & Jhingran 1991:1027 [ref. 20764], Arunkumar & Tombi Singh 2000:121 [ref. 25674], Raju Thomas et al. 2002:51 [ref. 26359], Yadav 2003:23 [ref. 27711], Pethiyagoda et al. 2008:44 [ref. 30097], Plamoottil & Abraham 2013:9 [ref. 33148], Plamoottil & Abraham 2014:51 [ref. 33147], Arunkumar 2016:2006 [ref. 35770], Arunkumar 2020:45 [ref. 37761]). Current status: Valid as Macrognathus guentheri (Day 1865). Mastacembelidae. Distribution: India. Habitat: freshwater.