n = 31
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Hexanematichthys rugispinis | (Valenciennes, 1840) | Amphiarius rugispinis | Ariidae | Softhead sea catfish |
| Hexanematichthys assimilis | (Günther, 1864) | Ariopsis assimilis | Ariidae | Mayan sea catfish |
| Hexanematichthys felis | (Linnaeus, 1766) | Ariopsis felis | Ariidae | Hardhead sea catfish |
| Hexanematichthys coerulescens | (Günther, 1864) | Ariopsis guatemalensis | Ariidae | Blue sea catfish |
| Hexanematichthys guatemalensis | (Günther, 1864) | Ariopsis guatemalensis | Ariidae | Blue sea catfish |
| Hexanematichthys jordani | (Eigenmann & Eigenmann, 1888) | Ariopsis seemanni | Ariidae | Tete sea catfish |
| Hexanematichthys seemanni | (Günther, 1864) | Ariopsis seemanni | Ariidae | Tete sea catfish |
| Hexanematichthys simonsi | (Starks, 1906) | Ariopsis seemanni | Ariidae | Tete sea catfish |
| Hexanematichthys longicephalus | (Eigenmann & Eigenmann, 1888) | Cathorops dasycephalus | Ariidae | Bigbelly sea catfish |
| Hexanematichthys dasycephalus | (Günther, 1864) | Cathorops dasycephalus | Ariidae | Bigbelly sea catfish |
| Hexanematichthys sp. | Not applicable | Cochlefelis insidiator | Ariidae | Flat catfish |
| Hexanematichthys sp. D | Not applicable | Cochlefelis insidiator | Ariidae | Flat catfish |
| Hexanematichthys sp. | Not applicable | Hemiarius dioctes | Ariidae | Warrior catfish |
| Hexanematichthys sp. Y | Not applicable | Hemiarius dioctes | Ariidae | Warrior catfish |
| Hexanematichthys henni | Fisher & Eigenmann, 1922 | Hexanematichthys henni | Ariidae | |
| Hexanematichthys mastersi | (Ogilby, 1898) | Hexanematichthys mastersi | Ariidae | Master's catfish |
| Hexanematichthys sagor | (Hamilton, 1822) | Hexanematichthys sagor | Ariidae | Sagor catfish |
| Hexanematichthys australis | (Günther, 1867) | Neoarius graeffei | Ariidae | Blue salmon catfish |
| Hexanematichthys leptaspis | Bleeker, 1862 | Neoarius leptaspis | Ariidae | Salmon catfish |
| Hexanematichthys bonillai | (Miles, 1945) | Notarius bonillai | Ariidae | New Granada sea catfish |
| Hexanematichthys kessleri | (Steindachner, 1876) | Notarius kessleri | Ariidae | Sculptured sea catfish |
| Hexanematichthys osculus | (Jordan & Gilbert, 1883) | Notarius osculus | Ariidae | Chomba sea catfish |
| Hexanematichthys platypogon | (Günther, 1864) | Occidentarius platypogon | Ariidae | Cominate sea catfish |
| Hexanematichthys couma | (Valenciennes, 1840) | Sciades couma | Ariidae | Couma sea catfish |
| Hexanematichthys dowii | (Gill, 1863) | Sciades dowii | Ariidae | Flapnose sea catfish |
| Hexanematichthys hymenorrhinos | Bleeker, 1862 | Sciades herzbergii | Ariidae | Pemecou sea catfish |
| Hexanematichthys herzbergii | (Bloch, 1794) | Sciades herzbergii | Ariidae | Pemecou sea catfish |
| Hexanematichthys parkeri | (Traill, 1832) | Sciades parkeri | Ariidae | Gillbacker sea catfish |
| Hexanematichthys passany | (Valenciennes, 1840) | Sciades passany | Ariidae | Passany sea catfish |
| Hexanematichthys proops | (Valenciennes, 1840) | Sciades proops | Ariidae | Crucifix sea catfish |
| Hexanematichthys leptocassis | Bleeker, 1861 | Sciades sona | Ariidae | Sona sea catfish |