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Contents
Family Delphacidae Leach, 1815
Subfamily Stenocraninae Wagner, 1963
Tribe Stenocranini Wagner, 1963
Genus Obtusicranus Bartlett, 2006
Type species (in original combination): Obtusicranus bicarinus Bartlett, 2006.
Distribution
Southwest USA and Mexico.
Distribution of Obtusicranus from FLOW (as of 10 Feb 2020)
Recognized species
There are two species currently placed in this genus.
Obtusicranus bicarinus Bartlett, 2006 – USA: Arizona, Colorado, Utah
Obtusicranus bifidus Bartlett, 2010 – Mexico
Plant associations
Obtusicranus bifidus Bartlett, 2010 – Bromus exaltatus Bernh. (Pooaceae: Pooideae: Bromeae).
Economic Importance
Limited. Both species are uncommonly encountered.
Recognition
New World Stenocraninae were recently reviewed by Bartlett (2010), including a key to genus.
Obrusicranus has its head projected in front of the eyes to a greater degree than Stenocranus, but less than Frameus or Tanycranus. The median carina of the frons is paired (single in Kelisicranus and Stenocranus), and the head is blunt in lateral view.
Obtusicranus bifidus is larger (~5.3-5.7mm vs. 4.1-4.8mm) than O. bicarinus and has a pale vitta on the mesothorax; O. bifidus also has two processes from the phallobase instead of one in O. bicarinus.
Obtusicranus bifidus
Obtusicranus bifidus
Molecular resources
There is COI, 18S and 28S data for Obtusicranus bicarinus in Genbank. BOLD has CO1 for the same species.
Selected references
Bartlett, C. R. 2010 (dated 2009). Diversity in New World Stenocranine Planthoppers (Hemiptera: Delphacidae). Transactions of the American Entomological Society 135(4): 443-486.
Bartlett, C. R. 2006 (dated 2005). Two new genera and species of stenocranine planthoppers (Hemiptera : Delphacidae) from North America. Entomological News 116(5): 291-303.
Bartlett, C. R., L. B. O’Brien and S. W. Wilson. 2014. A review of the planthoppers (Hemiptera: Fulgoroidea) of the United States. Memoirs of the American Entomological Society 50: 1-287.
Leach, W. E. 1815a. Entomology. The Edinburg encyclopedia; conducted by David Brewster 9: 57-172. (family Delphacidae p. 125).
Wagner, W. 1963 [dated 1962]. Dynamische Taxionomie, angewandt auf die Delphaciden Mitteleuropas. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut 60: 111-189.
Urban J. M. C. R. Bartlett and J. R. Cryan. 2010. Evolution of Delphacidae (Hemiptera: Fulgoroidea): combined-evidence phylogenetics reveals importance of grass host shifts. Systematic Entomology 35(4): 678-691.
