Leptagonus Gill [T. N.] 1861:167 Masc. Aspidophorus spinosissimus Krøyer 1845. Type by original designation (also monotypic). •Valid as Leptagonus Gill 1861 -- (Lindberg 1973:605 [ref. 7220], Yabe 1985:123 [ref. 11522], Andriashev in Whitehead et al. 1986:1266 [ref. 13677], Lindberg & Krasyukova 1987:341 [ref. 15964], Kanayama 1991:36 [ref. 19261], Sheiko 1993:75 [ref. 21227], Mecklenburg et al. 2002:527 [ref. 25968], Parin et al. 2002:S98 [ref. 28300], Sheiko & Mecklenburg 2004:11 [ref. 27591], Mecklenburg et al. 2011:125 [ref. 31212], Shinohara et al. 2011:45 [ref. 31715], Parin et al. 2014:289 [ref. 33547], Mecklenburg et al. 2016:110 [ref. 34440]). Current status: Valid as Leptagonus Gill 1861. Agonidae: Agoninae.