Nepa cinerea Linnaeus, 1758: 440. STS: male, female, Sweden, Europe (type locality restricted to Sweden by Tamanini, 1973a: 226); UZIU.
Nepa rubra Linnaeus, 1758: 440 (syn. Esaki, 1926b: 181; see also Kerzhner, 1981b, and Opinion 1335/1985). HT: female; UZIU.
Nepa scorpioaquaticus De Geer, 1773: 361. Unneccesary new name for Nepa cinerea Linnaeus, 1758 (Retzius, 1783: 90).
Nepa cinerarea Müller, 1774: 472. Incorrect subsequent spelling.
Nepa cinerea var. minor Puton, 1886b: 8 (upgraded by Poisson, 1961: 639; syn. J.T. Polhemus & al., 1994: 331). STS: Tunisia, Oued Tessa, Sidi-Mohamed-ben-Ali, Oued Bateha, Oued Eddedj, Gafsa, Gabès.
Nepa seurati Bergevin, 1926: 290 (downgraded by Nieser, 1978: 283; syn. J.T. Polhemus & al., 1994: 335). HT: male, Tunisia, Kebili; MNHN.
Nepa cinerea var. major Bergevin, 1926: 294 (upgraded by Poisson, 1961: 639; syn. J.T. Polhemus & al., 1994: 331). HT: male, Morocco, Taza; MNHN? (coll. Bergevin).
Nepa dollfusi Esaki, 1928a: 436 (April) (syn. Lindberg, 1929: 9; restored by Seidenstücker, 1963: 315, and named senior synonym of Nepa sardiniensis; synonymy with N. sardiniensis not accepted by Nieser, 1978: 283; syn. J.T. Polhemus & al., 1994: 335). HT: female, Morocco, Oued Djenanimès près Khénifra; MNHN.
Nepa cinerea var. orientalis Esaki, 1928a: 436 (upgraded by Poisson, 1961: 639; syn. J.T. Polhemus & al., 1994: 332). STS: 3 female, Russia (FE), Amur; BMNH.
Nepa rubra meridionalis Poisson, 1961: 635 (syn. J.T. Polhemus & al., 1994: 335). STS: France, Tunisia, Iberian Peninsula; USNM (coll. Poisson: 26 STS; 1 pin bearing 2 spec. from Tabanarka with a Type label).
Nepa remyi Poisson, 1961: 636 (syn. J.T. Polhemus & al., 1994: 332). STS: 1 male, 2 female, Morocco, Region d'Ifrane, Tagbaloute Caïd; USNM (coll. Poisson).
Nepa cinerea poissoni Tamanini, 1973a: 239 (syn. Nieser & Montes, 1984: 38). HT: male, France, Pyrenées-Orientales, Collioure; MCRI.