guentheri, Halosaurus Goode [G. B.] & Bean [T. H.] 1896:131 [Special Bulletin U. S. National Museum No. 2; ref. 1848] Northwestern Atlantic, 39°13'00"N, 72°01'00"W, Albatross station 2722, depth 594 fathoms. Holotype (unique): USNM 38070. Type catalog: Smith 1994:41 [ref. 21917]. •Valid as Halosaurus guentheri Goode & Bean 1896 -- (McDowell 1973:66 [ref. 24539], Shimizu in Uyeno et al. 1983:125 [ref. 14275], Sulak 1990:131 [ref. 19326], McEachran & Fechhelm 1998:214 [ref. 23897], Smith 2003:686 [ref. 26989], Moore et al. 2003:172 [ref. 27076], Pais et al. 2009:33 [ref. 30210], Shelyagin 2010:512 [ref. 31017], Lins Oliveira et al. 2015:39 [ref. 37485], Smith 2016:1599 [ref. 34556], Carneiro et al. 2019:56 [ref. 37250], Klautau et al. 2020:7 [ref. 37903], Fermon et al. 2022:112 [ref. 39448] with question, Page et al. 2023:50 [ref. 40505]). Current status: Valid as Halosaurus guentheri Goode & Bean 1896. Halosauridae. Distribution: Atlantic. Habitat: marine.