Hydraena Hydraena ateneo Hydraena angulicollis Hydraena circulata List of Hydraena species Stenoma hydraena List of water beetle species recorded in Britain Johann Gottlieb Kugelann Norman H. Joy Ignacio Ribera Harley Brown Hydraenidae List of beetles of Ireland List of the prehistoric life of Pennsylvania Stenoma List of the Cenozoic life of Colorado List of organisms named after famous people (born 1900–1949) List of organisms named after famous people (born before 1800) List of organisms named after famous people (born 1800–1899) Staphylinoidea