Megalonotus is a genus of seed bugs in the family Rhyparochromidae.
Species are mostly found in the Palaearctic and Nearctic realms; Megalonotus antennatus, M. chiragra (the type speciesLygaeoidea Species File: Megalonotus Fieber, 1861), M. dilatatus, M. emarginatus, M. praetextatus and M. sabulicola are recorded from the British Isles.
Species The following species (27 in 2025) belong to the genus Megalonotus:
Megalonotus antennatus (Schilling, 1829) c g Megalonotus brevicornis (Puton, A., 1883) c g Megalonotus chiragra - type species (as Lygaeus chiragra Fabricius, 1794) Megalonotus colon Puton, A., 1874 c g Megalonotus dilatatus (Herrich-Schaeffer, 1840) c g Megalonotus dilitatus (Herrich-Schaeffer, 1840) g Megalonotus emarginatus (Rey, C., 1888) c g Megalonotus hirsutus Fieber, F.X., 1861 c g Megalonotus lederi (Horvath, G., 1880) c g Megalonotus longipilus (Puton, A., 1884) c g Megalonotus maximus (Puton, A. & Noualhier, 1895) c g Megalonotus merus Seidendstucker, 1979 c g Megalonotus mixtus (Horvath, G., 1887) c g Megalonotus nitidicollis Puton, A., 1874 c g Megalonotus opaconotum (Lindberg, H., 1953) c g Megalonotus parallelus (Horvath, G., 1911) c g Megalonotus praetextatus (Herrich-Schaeffer, G.H.W., 1850) c g Megalonotus puncticollis (Lucas, 1849) c g Megalonotus rugulosus (Linnavuori, R., 1953) c g Megalonotus sabulicola (Thomson, 1870) i b Megalonotus sabulicolus (Thomson, 1870) c g Megalonotus scaurus Seidenstucker, 1973 c g Megalonotus semela Linnavuori, 1970 c g Megalonotus setosus Puton, A., 1874 c g Megalonotus sophenus Seidenstucker, 1973 c g Megalonotus subtilissimus Roubal, 1961 g Megalonotus tricolor (Horvath, G., 1895) c g
Data sources: i = ITIS, c = Catalogue of Life, g = GBIF, b = Bugguide.net
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