mononema, Diplolychnus Regan [C. T.] & Trewavas [E.] 1929:28, Pl. 5 (fig. 2) [Danish Dana Expedition 1920-22 in the North Atlantic and the Gulf of Panama, Oceanographical Reports. v. 2 (no. 5); ref. 3680] Caribbean Sea west of St. Croix Island, Dana station 1279 and 1281, 17°43'N, 64°56'W, 300-1200 meters of wire out. Syntypes: BMNH 1929.1.4.121 (1), ZMUC P202858 (1). Type catalog: Nielsen 1974:28 [ref. 9588]. •Valid as Diplolychnus mononema Regan & Trewavas 1929 -- (Gibbs 1964:341 [ref. 6960]). •Valid as Borostomias mononema (Regan & Trewavas 1929) -- (Gibbs & Morrow 1973:128 [ref. 7174], Fujii in Uyeno et al. 1983:147 [ref. 14275], Gibbs in Whitehead et al. 1984:333 [ref. 13675], Gibbs 1986:233 [ref. 5655], Paxton et al. 1989:196 [ref. 12442], Paulin et al. 1989:100 [ref. 24556], Gibbs 1990:305 [ref. 14899], McEachran & Fechhelm 1998:460 [ref. 23897], Fricke 1999:90 [ref. 24106], Harold 1999:1906 [ref. 24741], Hutchins 2001:19 [ref. 25847], Harold 2003:895 [ref. 27001], Paxton et al. 2006:438 [ref. 28995], Stewart & Kenaley 2015:483 [ref. 34250], Harold 2016:1799 [ref. 34568], Carneiro et al. 2019:96 [ref. 37250], Sutton et al. 2020:97 [ref. 37832], Fermon et al. 2022:173 [ref. 39448], Robertson et al. 2022:87 [ref. 39353], Page et al. 2023:87 [ref. 40505]). Current status: Valid as Borostomias mononema (Regan & Trewavas 1929). Stomiidae: Astronesthinae. Distribution: Circumglobal, except eastern Pacific. Habitat: marine.