title: Contributions to the knowledge of North American tenebrionids of the subtribe Cylindrinotina (Coleoptera: Tenebrionidae: Helopini).
abstract: Three North American species of Helops are reassigned to the genus Nalassus: N. aereus (Germar, 1824), comb. n., N. californicus (Mannerheim, 1843), comb. n., N. convexulus (LeConte, 1861), comb. n. Current distributions as well as paleo distributions are discussed. A lectotype is designated for Helops californicus.
authors.affiliation: The Caspian institute of Biological Resourses of Russian Academy of Science, 367000, M. Gadzhieva str. 45, Makhachkala, the Republic of Dagestan, 367000 Russia.; Email: nalassus@mail.ru.
authors.forename: Maxim
authors.initials: M
authors.lastname: Nabozhenko
authors.affiliation: Zoological Museum of Moscow Lomonosov State University, Bolshaya Nikitskaya 6, Moscow, 125009 Russia.; Email: nnikitsky@mail.ru.
authors.forename: Nikolay
authors.initials: N
authors.lastname: Nikitsky
authors.affiliation: Department of Entomology, California Academy of Sciences, 55 Music Concourse Dr., Golden Gate Park, San Francisco, California, 94118 USA.; Email: raalbu@comcast.net.
authors.forename: Rolf
authors.initials: R
authors.lastname: Aalbu
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D001517:Coleoptera / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D017753:Ecosystem; D005260:Female; D008297:Male; D009656:North America; D009929:Organ Size