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Subfamily Entiminae - Broad-nosed Weevils

asiatic oak beetle - Cyrtepistomus castaneus Striped Weevil - Panscopus gemmatus Broadnose - Colecerus dispar Little Green Bug - Polydrusus formosus Pachnaeus litus? - Pachnaeus litus Barypeithes pellucidus Twobanded Japanese weevil - Pseudocneorhinus bifasciatus Weevil;? - Myllocerus undecimpustulatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Curculionoidea (Snout and Bark Beetles)
Family Curculionidae (Snout and Bark Beetles)
Subfamily Entiminae (Broad-nosed Weevils)
Synonyms and other taxonomic changes
Brachyderinae, Leptopiinae, Otiorhynchinae, Tanymecinae, Thylacitinae
Explanation of Names
Entiminae Schönherr 1823
the most diverse weevil subfamily in NA, with 124 genera in 23 tribes represented (hundreds of spp.)(1)(2); 54 tribes worldwide(3)
Rostrum (snout) at most about two times as long as wide, often considerably shorter. NB: members of other subfamilies (esp. Cossoninae, Scolytinae, and Lixinae) may have short snouts!
Antennae inserted dorsally (then diagnostic), or laterally. The first antennomere usually reaches or surpasses eyes when laid backwards (a rare case in other subfamilies)
Apical excision of the rostrum completely covered by the mentum, no submentum present (the defining character of the group, but only visible in a ventral view)
A quick pictorial guide here
tend to be polyphagous herbivores
Life Cycle
Larvae of the group generally live in soil and feed on roots. Eggs are dropped, laid on soil under plant, but never placed in plant tissues. Many spp. are parthenogenetic (several such lineages within the subfamily).
both the polyphagy and parthenogenesis greatly facilitate introduction/establishment of alien species -- see(4)
forms a distinctive clade with Cyclominae & Hyperinae(5)
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
2.Insects and Arachnids of Canada Series, Part 25. Coleoptera, Curculionidae, Entiminae.
Donald E. Bright, Patrice Bouchard. 2008. 2008. NRC Research Press, Ottawa, Ontario, Canada.
3.Family-group names in Coleoptera (Insecta)
Bouchard P. et al. 2011. ZooKeys 88: 1–972.
4.List of non-native arthropods in North America. Part II
5.Bulk de novo mitogenome assembly from pooled total DNA elucidates the phylogeny of weevils (Coleoptera: Curculionoidea)
Gillett C.P.D.T., Crampton-Platt A., Timmermans M.J.T.N., Jordal B.H., Emerson B.C., Vogler A.P. 2014. Mol. Biol. Evol. 31: 2223-2237.