OROPUELLA, A NEW GENUS OF ORTHOCLADIINAE FROM THE WESTERN NEARCTIC Abstract Author Fasbender, Andrew Rhithron Associates Inc., 33 Fort Missoula Road, Missoula, MT 59804, USA afasbender@rhithron.com text CHIRONOMUS Journal of Chironomidae Research 2020 2020-02-12 33 17 30 journal article 30580 10.5324/cjcr.v0i33.3068 72f48bb4-940b-4267-8621-ac3eac9a9d54 2387-5372 7996044 B1BF8C50-50DE-432B-BA3E-BC86F743481D Oropuella sp. F 3 Material examined: USA . WASHINGTON : Pend Oreille Co. , North Fork Sullivan Creek , 48.8607°N , 117.3272°W , 19.vii.2017 , WADOE17SE004 ( 1 female pupa (slide) [ AFPC ]) . Diagnostic characters: Adult female. Tergite IX semicircular, with ~11 setae. Gonapophysis VIII dorsomedial lobes nearly touching at apex. Description: Adult female (pharate). Figs 1d , 3c, f, i . Measurements (n = 1): flagellomeres (μm): 51, 41, 40, 41, 62; AR 0.35; spermathecae 157–159 x 102. Tergite IX semicircular. Gonapophysis VIII dorsomedial lobes nearly touching medially, apex broadly pointed; ventrolateral lobes separate. Pupa. Fig. 4g . Measurements (n = 1): length 2.5 mm . Sternites VI–VII with posterior spinule band. Oropuella unassociated larval material: USA . CALIFORNIA : Lassen Volcanic National Park , Manzanita Creek , 40.5373°N , 121.5926°W , 21.viii.2017 , NPS17LAS010 ( 1 larva (slide) ANSP-ENT-124838 [ ANSP ]); Redwood National Park , Godwood Creek , 41.3704°N , 124.026°W , 11.vi.2018 , NPS18 REDW002 ( 2 larvae (slide) ANSP-ENT-124836–124837 [ ANSP ]); Redwood National Park , Unnamed Streelow Creek Trail , 41.3465°N , 124.0387°W , 6.vi.2018 , NPS18 REDW003 ( 1 larva (alcohol) ANSP-ENT-124839 [ ANSP ]). MONTANA : Granite Co. , Lolo National Forest, Butte Cabin Creek, 46.512°N , 113.745°W , 29.v.2016 , leg. A Fasbender ( 1 larva (slide) [ AFPC ]); Lewis and Clark Co. , Dearborn River Middle Fork downhill from Hwy 200, 47.0914°N , 112.3618°W 27.ix.2017 . MTDEQ17 REF4005 ( 8 larvae (alcohol) [ AFPC ]). OREGON : Crater Lake National Park , Sun Creek , 42.8656°N , 122.08647°W 12.ix.2018 , NPS18CRLA026 ( 3 larvae (slide) ANSP-ENT-124833–124835 [ ANSP ]); Josephine Co. , Booze Creek at RM 0.2, 42.6596°N , 123.6597°W 24.viii.2017 , ODEQ17 SH031 ( 1 larva (alcohol) [ AFPC ]); Oregon Caves National Monument , Cave Creek , 42.098°N , 123.411°W , 2.vi.2015 , NPS15 ORCA001 ( 1 larva with pharate pupa ANSP-ENT-124832, 4 larvae (slide) ANSP-ENT-124828–124831 [ ANSP ]; 1 larva sequenced). WASHINGTON : King Co., Vashon Island, Judd Creek, 28A_17, 47.4034°N , 122.4688°W , 3.viii.2017 , KC17VAS003 ( 1 larva (slide) [ AFPC ]); Pierce Co. , Huckleberry Creek , 47.0085°N , 121.6173°W 2.viii.2017 , WADOE17 AM006 ( 3 larvae (alcohol) [ AFPC ]).