Xenisthmus Snyder [J. O.] 1908:105 Masc. Xenisthmus proriger Snyder 1908. Type by original designation (also monotypic). •Valid as Xenisthmus Snyder 1908 -- (Springer 1983:1 [ref. 5365], Akihito in Masuda et al. 1984:241 [ref. 6441], Hoese 1986:811 [ref. 5670], Springer 1988:536 [ref. 6683], Birdsong et al. 1988:183 [ref. 7303], Leis et al. 1993 [ref. 20314], Gill & Hoese 1993:1049 [ref. 21609], Gill 2001:3606 [ref. 26295], Gill & Hoese 2004:241 [ref. 27774], Hoese 2006:1700 [ref. 28988], Thacker 2011:81 [ref. 31726] in Eleotridae, Gill et al. 2014:492 [ref. 33138], Gill et al. 2017:203 [ref. 35404], Fricke et al. 2018:344 [ref. 35805], Golani & Fricke 2018:165 [ref. 36273], Parenti 2021:57 [ref. 38603], Chen et al. 2022:13 [ref. 39615]). Current status: Valid as Xenisthmus Snyder 1908. Xenisthmidae.