haplocaulus, Leptostomias Regan [C. T.] & Trewavas [E.] 1930:59, Fig. 37 [Danish Dana Expedition 1920-22 in the North Atlantic and the Gulf of Panama, Oceanographical Reports. v. 2 (no. 6); ref. 3681] West of Bermuda, western Atlantic, 33°15'N, 68°20'W, Dana station 1341, depth 75 meters (200 meters of wire out). Holotype (unique): ZMUC P201917. Type catalog: Nielsen 1974:20 [ref. 9588]. •Valid as Leptostomias haplocaulus Regan & Trewavas 1930 -- (Gibbs in Whitehead et al. 1984:355 [ref. 13675], Gibbs & Barnett 1990:326 [ref. 14915], Arruda 1997:38 [ref. 24952], McEachran & Fechhelm 1998:523 [ref. 23897], Harold 2003:912 [ref. 27001], Harold 2016:1814 [ref. 34568], Carneiro et al. 2019:101 [ref. 37250], Sutton et al. 2020:114 [ref. 37832], Page et al. 2023:89 [ref. 40505]). Current status: Valid as Leptostomias haplocaulus Regan & Trewavas 1930. Stomiidae: Melanostomiinae. Distribution: Circumglobal. Habitat: marine.