Pachybrachis es un género de escarabajos de hoja, Chrysomelidae , de la tribu Cryptocephalini de la subfamilia Cryptocephalinae y pertenece al grupo de barrenadores de la nuez llamado Camptosomata.
Pachybrachis impurus .
Está compuesto por 350 especies, de las cuales 200 habitan el hemisferio Norte y el resto tiene distribución Paleártica . La mayor cantidad de especies fue descrita en la segunda mitad del siglo XX , particularmente a partir del trabajo de Burlini, quien clasificó más de 50 especies de este género.[ 2]
Pachybrachis abdominalis Say 1824
Pachybrachis alacris Fall 1915
Pachybrachis alticola Fall 1915
Pachybrachis analis LeConte 1861
Pachybrachis anoguttatus Suffrian, 1866
Pachybrachis antigae Weise, 1890
Pachybrachis arizonensis Bowditch 1909
Pachybrachis autolycus Fall 1915
Pachybrachis azureus Suffrian, 1848
Pachybrachis badius Fall 1915
Pachybrachis baeticus Weise, 1882
Pachybrachis bajulus Suffrian 1852
Pachybrachis bivittatus Say 1824
Pachybrachis brevicollis LeConte 1880
Pachybrachis brevicornis Fall 1915
Pachybrachis brunneus Bowditch 1909
Pachybrachis bullatus Fall 1915
Pachybrachis caelatus LeConte 1858
Pachybrachis calcaratus Fall 1915
Pachybrachis calidus Fall 1915
Pachybrachis californicus Fall 1915
Pachybrachis carbonarius Haldeman 1849
Pachybrachis carolinensis Bowditch 1910
Pachybrachis carpathicus Rey, 1883
Pachybrachis cephalicus Fall 1915
Pachybrachis chaoticus Fall 1915
Pachybrachis cinctus Suffrian, 1848
Pachybrachis circumcinctus Crotch 1874
Pachybrachis coloradensis Bowditch 1909
Pachybrachis confederatus Fall 1915
Pachybrachis conformis Suffrian 1852
Pachybrachis confusus Bowditch 1909
Pachybrachis connexus Fall 1915
Pachybrachis consimilis Fall 1915
Pachybrachis conspirator Fall 1915
Pachybrachis contractifrons Fall 1915
Pachybrachis convictus Fall 1915
Pachybrachis crassus Bowditch 1909
Pachybrachis creticus Weise, 1886
Pachybrachis cribricollis Pic, 1907
Pachybrachis croftus Bowditch 1909
Pachybrachis cruentus LeConte 1880
Pachybrachis cylindricus Bowditch 1909
Pachybrachis delumbis Fall 1915
Pachybrachis densus Bowditch 1909
Pachybrachis desertus Fall 1915
Pachybrachis dilatatus Suffrian 1852
Pachybrachis discoideus Bowditch 1909
Pachybrachis diversus Fall 1915
Pachybrachis donneri Crotch 1874
Pachybrachis dubiosus LeConte 1880
Pachybrachis duryi Fall 1915
Pachybrachis elegans Graells, 1851
Pachybrachis excisus Weise, 1887
Pachybrachis exclusus Rey, 1883
Pachybrachis falli Leng 1920
Pachybrachis femoratus Olivier 1808
Pachybrachis flexuosus Weise, 1882
Pachybrachis fortis Fall 1915
Pachybrachis fractus Fall 1915
Pachybrachis fulvipes Suffrian, 1848
Pachybrachis fuscipes Fall 1915
Pachybrachis gracilipes Fall 1915
Pachybrachis haematodes Suffrian 1852
Pachybrachis hepaticus Melsheimer 1847
Pachybrachis hybridus Suffrian 1852
Pachybrachis illectus Fall 1915
Pachybrachis immaculatus Jacoby 1889
Pachybrachis impurus Suffrian 1852
Pachybrachis infaustus Haldeman 1849
Pachybrachis insidiosus Fall 1915
Pachybrachis integratus Fall 1915
Pachybrachis jacobyi Bowditch 1909
Pachybrachis karamani Weise, 1893
Pachybrachis korbi Weise, 1891
Pachybrachis kraatzi Weise, 1882
Pachybrachis lachrymosus Fall 1915
Pachybrachis laetificus Marseul, 1875
Pachybrachis laevis Bowditch 1909
Pachybrachis latithorax Clavareau 1913
Pachybrachis liebecki Fall 1915
Pachybrachis limbatus Ménétriés, 1836
Pachybrachis lineolatus Suffrian, 1848
Pachybrachis litigiosus Suffrian 1852
Pachybrachis livens LeConte 1858
Pachybrachis lodingi Bowditch 1909
Pachybrachis longus Bowditch 1909
Pachybrachis luctuosus Suffrian 1858
Pachybrachis luridus Fabricius 1798
Pachybrachis lustrans LeConte 1880
Pachybrachis m-nigrum Melsheimer 1847
Pachybrachis macronychus Fall 1915
Pachybrachis marginatus Bowditch 1909
Pachybrachis marginipennis Bowditch 1909
Pachybrachis marmoratus Jacoby 1889
Pachybrachis melanostictus Suffrian 1852
Pachybrachis mellitus Bowditch 1909
Pachybrachis mercurialis Fall 1915
Pachybrachis microps Fall 1915
Pachybrachis minor Bowditch 1909
Pachybrachis mitis Fall 1915
Pachybrachis mobilis Fall 1915
Pachybrachis morosus Haldeman 1849
Pachybrachis nero Bowditch 1909
Pachybrachis nigropunctatus Suffrian, 1854
Pachybrachis nigricornis Say 1824
Pachybrachis nobilis Fall 1915
Pachybrachis nogalicus Fall 1915
Pachybrachis notatus Bowditch 1910
Pachybrachis nubigenus Fall 1915
Pachybrachis nubilus Bowditch 1909
Pachybrachis nunenmacheri Fall 1915
Pachybrachis obfuscatus Fall 1915
Pachybrachis obsoletus Suffrian 1852
Pachybrachis osceola Fall 1915
Pachybrachis othonus Say 1825
Pachybrachis pallidulus Suffrian, 1851
Pachybrachis parvinotatus Fall 1915
Pachybrachis pawnee Fall 1915
Pachybrachis peccans Suffrian 1852
Pachybrachis pectoralis Melsheimer 1847
Pachybrachis petronius Fall 1915
Pachybrachis picturatus Germar 1824
Pachybrachis picus Weise, 1882
Pachybrachis pinguescens Fall 1915
Pachybrachis placidus Fall 1915
Pachybrachis pluripunctatus Fall 1915
Pachybrachis postfasciatus Fall 1915
Pachybrachis pradensis Marseul, 1875
Pachybrachis praeclarus Weise 1913
Pachybrachis precarius Fall 1915
Pachybrachis prosopis Fall 1915
Pachybrachis proximus Bowditch 1909
Pachybrachis pteromelas Graells, 1858
Pachybrachis pulvinatus Suffrian 1852
Pachybrachis punctatus Bowditch 1909
Pachybrachis punicus Fall 1915
Pachybrachis purus Fall 1915
Pachybrachis pusillus Bowditch 1909
Pachybrachis quadratus Fall 1915
Pachybrachis quadrioculatus Fall 1915
Pachybrachis regius Schaufuss, 1862
Pachybrachis relictus Fall 1915
Pachybrachis roboris Fall 1915
Pachybrachis rugifer Abeille, 1904
Pachybrachis sanrita Bowditch 1909
Pachybrachis scripticollis Faldermann, 1837
Pachybrachis scriptidorsum Marseul, 1875
Pachybrachis scriptus Herrich-Schaeffer, 1838
Pachybrachis siculus Weise, 1891
Pachybrachis signatifrons Mannerheim 1843
Pachybrachis signatus Bowditch 1909
Pachybrachis simius Marseul, 1875
Pachybrachis sinuatus Mulsant & Rey, 1859
Pachybrachis snowi Bowditch 1909
Pachybrachis sonorensis Jacoby 1889
Pachybrachis spumarius Suffrian 1852
Pachybrachis stygicus Fall 1915
Pachybrachis subfasciatus Leconte 1824
Pachybrachis sublimatus Fall 1915
Pachybrachis subvittatus LeConte 1880
Pachybrachis suffrianii Schaufuss, 1862
Pachybrachis tacitus Fall 1915
Pachybrachis terminalis Suffrian, 1849
Pachybrachis tessellatus Olivier, 1791
Pachybrachis testaceus Perris, 1865
Pachybrachis texanus Bowditch 1909
Pachybrachis thoracicus Jacoby 1889
Pachybrachis tridens Melsheimer 1847
Pachybrachis trinotatus Melsheimer 1847
Pachybrachis truncatus Bowditch 1909
Pachybrachis tumidus Bowditch 1909
Pachybrachis turbidus LeConte 1880
Pachybrachis turgidicollis Fall 1915
Pachybrachis tybeensis Fall 1915
Pachybrachis umbraculatus Suffrian 1852
Pachybrachis uncinatus Fall 1915
Pachybrachis uteanus Fall 1915
Pachybrachis vacillatus Fall 1915
Pachybrachis varians Bowditch 1909
Pachybrachis varicolor Suffrian 1852
Pachybrachis vau Fall 1915
Pachybrachis vermicularis Suffrian, 1854
Pachybrachis vestigialis Fall 1915
Pachybrachis viduatus Fabricius 1801
Pachybrachis virgatus LeConte 1880
Pachybrachis vulnerosus Fall 1915
Pachybrachis wenzeli Fall 1915
Pachybrachis wickhami Bowditch 1909
Pachybrachis xantholucens Fall 1915
Pachybrachis xanti Crotch 1873
Pachybrachis absinthii Lopatin, 1990
Pachybrachis additus Lopatin, 1991
Pachybrachis alcantarensis De la Rosa, 2012
Pachybrachis alpinus Rapilly, 1982
Pachybrachis anatolicus Lopatin, 1985
Pachybrachis aragonicus Tempère & Rapilly, 1981
Pachybrachis boreopersicus Lopatin, 1991
Pachybrachis burlinii Daccordi & Ruffo, 1971
Pachybrachis canigouensis Lambelet, 2005
Pachybrachis catalonicus Burlini, 1968
Pachybrachis cordatus Sassi & Schoeller, 2003
Pachybrachis danieli Burlini, 1968
Pachybrachis dimorphus Medvedev, 1978
Pachybrachis fraudator Lopatin, 1991
Pachybrachis fraudolentus Müller, 1955
Pachybrachis freidbergi Lopatin, 1994
Pachybrachis freyi Burlini, 1957
Pachybrachis heptapotamicus Lopatin, 1997
Pachybrachis jastschenkoi Lopatin, 1995
Pachybrachis jordanicus Lopatin, 1984
Pachybrachis kaplini Lopatin, 1986
Pachybrachis koktumensis Lopatin, 1991
Pachybrachis korotjaevi Lopatin, 1995
Pachybrachis leonardii Sassi & Schöller, 2003
Pachybrachis lindbergi Burlini, 1963
Pachybrachis lopatini Medvedev & Rybakova, 1980
Pachybrachis marki Lopatin, 1997
Pachybrachis mitjaevi Lopatin & Kulenova, 1982
Pachybrachis mogol Lopatin, 1986
Pachybrachis mongolensis Medvedev & Rybakova, 1980
Pachybrachis petitpierrei Daccordi, 1976
Pachybrachis planifrons Wagner, 1972
Pachybrachis potanini Medvedev & Rybakova, 1980
Pachybrachis pudicus Lopatin, 1984
Pachybrachis rapillyi Lopatin, 1984
Pachybrachis rondanus Burlini, 1968
Pachybrachis ruffoi Burlini, 1956
Pachybrachis salfii Lopatin, 1984
Pachybrachis saudicus Lopatin, 1979
Pachybrachis semidesertus Lopatin en Lopatin & Konstantinov, 1994
Pachybrachis sinkianensis Lopatin, 1995
Pachybrachis steinhauseni Schoeller, 2005
Pachybrachis tekensis Lopatin, 1983
Pachybrachis velarum Warchalowski, 1998
Pachybrachis viedmai Burlini, 1968