Capnia umpqua Frison 1942

Stewart, Kenneth W., Drake, Eugene F. & Stark, Bill P., 2011, Larvae Of Five Species Of The Winter Stonefly Genus Capnia (Plecoptera: Capniidae) From California, U. S. A., Illiesia 7 (18), pp. 167-181: 175

publication ID

http://doi.org/10.5281/zenodo.4760235

DOI

http://doi.org/10.5281/zenodo.4763857

persistent identifier

http://treatment.plazi.org/id/99668795-AE0A-8006-FEF5-1D9E805B7072

treatment provided by

Felipe

scientific name

Capnia umpqua Frison 1942
status

 

Capnia umpqua Frison 1942  

( Figs. 10, 11 View Figs , 20-25 View Figs , 44-49 View Figs , 56-59 View Figs )

Distribution. California and Oregon.

Material examined. California: Orange Co., Trabuko Creek, Trabuko Canyon , 1 st concrete low water crossing, N 33 ° 40.29 ’ W 117 ° 32.45 ’, 5-IV-2005, K.W. Stewart and E.F. Drake, 8♂, 58♀, 1♂ reared with exuvium, 2♂ larvae, 1♀ larva. Same locality, 25-IV- 2005, E.F. Drake, 6♀. No other Capnia species   collected at this locality GoogleMaps   .

Characters. Body length ♂ 5.0-6.0mm. Light to medium brown dorsally, ventrum lighter, little pattern except underlying muscles or developing adult pigment ( Figs. 20, 23 View Figs ). Antennal segments 46- 48, head capsule width ♂ 0.75mm, ♀ 0.96mm. Lacinia triangular, palmate with longitudinally striate palm surface, broad apical teeth, ventral comb of 10-14 bristles and dorsal comb of 16-18 longer bristles ( Fig. 44 View Figs ). Right mandible with apical teeth, molar pad of dense, stiff bristles, and inner band of hairs from base of apical teeth to molar pad ( Figs. 45, 46 View Figs ). Left mandible with molar cup bordered by outer (dorsal) comb of curved teeth ( Figs. 47, 48 View Figs ). Pronotum with scattered setae over surface and as a marginal fringe ( Fig. 20 View Figs ). Mesosternal Y-arms with enclosed subtriangular area about 0.3 times the intercostal width ( Fig. 22 View Figs ). Hind wingpads shallowly notched along inner margin ( Fig. 20 View Figs ); inside forewingpad length ♂ 0.96mm, ♀ 1.08mm. Femora with scattered surface bristles, and tibia with a silky outer fringe ( Fig. 21 View Figs ). Abdominal segments with long surface hairs ( Fig. 56 View Figs ). Sexual dimorphism evident. Males with short posterior extension of 10 th tergum, triangular in dorsal and ventral views ( Figs. 11 View Figs , 23 View Figs ) with underlying developing narrow, tubular epiproct visible in pharate individuals ( Figs. 11 View Figs , 23 View Figs ); 10 th tergum in lateral view subtriangular, nearly straight dorsally, with slightly downturned tip ( Figs. 10 View Figs , 49 View Figs ). Female without posterior extension of 10 th tergum ( Fig. 20 View Figs ). Cercal segments 28-30; cercomeres with apical circlet of short and long bristles, longer dorsal and ventral bristle in lateral view, and no intercalary hairs ( Figs. 24, 25 View Figs , 58, 59 View Figs ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Capniidae

Genus

Capnia