Review of the aquatic Hemiptera from Cephalonia, with a checklist for the Ionian Islands, Greece (Heteroptera: Gerromorpha, Nepomorpha, Leptopodomorpha)

Eleven species of aquatic true bugs (Hemiptera: Heteroptera) are newly recorded for Cephalonia Island (Greece)—Gerromorpha: Hydrometra stagnorum (Linnaeus, 1758), Microvelia pygmaea (Dufour, 1833), Velia mariae Tamanini, 1971, Gerris argentatus Schummel, 1832, G. costae (Herrich-Schäffer, 1850), G. lacustris (Linnaeus, 1758); Nepomorpha: Corixa affinis Leach, 1817, Anisops crinitus Brooks, 1951, A. sardeus Herrich-Schäffer, 1849, Notonecta maculata Fabricius, 1794, Plea minutissima Leach, 1817—where only a few species have been recorded. The most notable records are: Anisops crinitus, which in Europe was known only from the island of Corfu (Greece) and Spain (until recently under the name A. marazanofi Poisson, 1966), and Velia mariae, whose distribution is still poorly known. Velia rivulorum (Fabricius, 1775), V. currens (Fabricius, 1794), and Anisops canariensis Nouahlier, 1893 (currently A. debilis canariensis), from old literature records, are excluded from the fauna of the Ionian Islands. Similarly, N. glauca glauca Linnaeus, 1758 is excluded from the fauna of Cephalonia and Corfu. The first record of Hydrometra gracilenta Horváth, 1899 from Corfu and for the Ionian Islands is provided. Microvelia pygmaea and Gerris maculatus Tamanini, 1946 are newly recorded for Lefkada Island. An annotated list of the Gerromorpha, Nepomorpha, and Leptopodomorpha of the Ionian Islands also is given.