longissimus, Heteroconger Günther [A.] 1870:45 [Catalogue of the fishes in the British Museum v. 8; ref. 1995] Lanzarote Island, Canary Islands. Holotype (unique): BMNH 1931.3.5.3. See account of Heteroconger halis -- If the e. and w. Atlantic populations are considered separate species, H. longissimus applies to the e. Atlantic form and H. halis to the w. Atlantic form. •Valid as Taenioconger longissimus (Günther 1870) -- (Bauchot & Saldanha in Whitehead et al. 1986:573 [ref. 13676]). •Valid as Heteroconger longissimus Günther 1870 -- (Smith 1989:485 [ref. 13285], Smith 1990:162 [ref. 13454], Tyler & Luckhurst 1994:90 [ref. 22552], González-Lorenzo et al. 1995:554 [ref. 22877], Castle 1997:8 [ref. 22878], Castle & Randall 1999:7 [ref. 24042], Smith-Vaniz et al. 1999:142 [ref. 25013], Schmitter-Soto et al. 2000:149 [ref. 27754], Smith 2002:834 [ref. 26549], Menezes et al. in Menezes et al. 2003:37 [ref. 27192], Smith 2003:749 [ref. 26989], Smith et al. 2003:9 [ref. 27621], Nelson et al. 2004:64 [ref. 27807], Lasso-Alcalá & Klein S. 2005:263 [ref. 28377], Wirtz et al. 2007:5, 26 [ref. 30263], Page et al. 2013:65 [ref. 32708], Smith-Vaniz & Jelks 2014:26 [ref. 33341], Smith 2016:1692 [ref. 34556], Carneiro et al. 2019:67 [ref. 37250], Reiner 2019:75 [ref. 38139], Robertson et al. 2020:153 [ref. 38098], Bennema & van Moorsel 2022:74 [ref. 39585], Carvalho-Filho 2023:56 [ref. 40480], Hoff et al. 2023:6 [ref. 40463], Martínez-Servín et al. 2023:112 [ref. 40726], Page et al. 2023:56 [ref. 40505], Fricke et al. 2024:133 [ref. 41622]). Current status: Valid as Heteroconger longissimus Günther 1870. Congridae: Heterocongrinae. Distribution: Western Atlantic: Bermuda south to São Paulo (Brazil), including Caribbean Sea; eastern Atlantic: including Madeira, and São Tomé and Principe. Habitat: marine.