Capnia inyo Nelson & Baumann 1987

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 : 170

Capnia inyo Nelson & Baumann 1987

( Figs. 15-19 , 32-37 )

Distribution. California.

Material examined. California: Inyo Co., Lone Pine Creek, Lone Pine Campground , N 36 ° 35.860 ’ W 118 ° 11.203 ’, Elev. 1795m, 17-18-II-2010, E. F. Drake. 33♂, 14♀, 5 reared ♂ with exuviae, 3 reared ♀ with exuviae, 1 partially emerged ♂ in larval exuviumaedeagus everted, 7♂ larvae, 22♀ larvae, 3♂ exuviae, 1♀ exuvium; water temperature on collection date 3.3 ° C, snow on ground.

Characters. Body length ♂ 6.6-6.8mm, ♀ 6.9-7.2mm. Light to medium brown dorsally, ventrum lighter, little pattern except underlying muscles or developing adult pigment ( Fig. 15 ). Antennal segments 42-44, head capsule width ♂ 0.72-0.75mm, ♀ 0.84-0.0.90mm. Lacinia and mandibles as described for C. umpqua and C. ventura ( Figs. 44-48 , 50-53 ). Pronotum with setae scattered over surface and as a sparse marginal fringe ( Fig. 15 ). Mesosternal Y-arms enclose a subtriangular area about 0.3 times the intercostal width ( Fig. 16 ). Hind wingpads shallowly notched along inner margins ( Fig. 15 ); inside forewingpad length ♂ 0.96-0.99mm, ♀ 1.44-1.50mm. Femora bear scattered surface bristles, and tibia with a silky outer fringe ( Fig. 15 ). Abdominal segments with long surface hairs ( Figs. 32, 33 ). Sexual dimorphism evident. Male 10 th tergum with 0.7-0.8mm long tubular posterior extension in dorsal view ( Fig. 15 ); underlying tubular developing epiproct visible in pharate individuals ( Fig. 15 ); 10 th tergum in lateral view tubular and downcurved ( Figs. 17 , 34 ). Female without posterior extension of 10 th tergum ( Fig. 18 ). Cercal segments about 32; cercomeres with apical circlet of short and long bristles, longer dorsal and ventral bristle in lateral view, and no evident intercalary hairs ( Fig. 35-37 ).

Figures

Figs. 15-19. Capnia inyo larval characters. 15. Male habitus. 16. Mesosternum. 17. Pharate male terminalia, lateral. 18. Female terminalia, dorsal. 19. Cercus, lateral. Scale line= 2mm.

Figs. 32-37. Capnia inyo larval characters. 32. Abdominal tergum 8. 33. Abdominal sternum 8. 34. Male terminalia, lateral. 35-37. Cercomeres 5-6, 15, 20, lateral.

Figs. 44-49. Capnia umpqua larval characters. 44. Lacinia, ventral. 45. Right mandible. 46. Right mandible molar pad, detail. 47. Left mandible, ventral. 48. Left mandible molar cup, detail. 49. Male terminalia, lateral.

Figs. 50-55. Capnia ventura larval characters. 50. Lacinia, ventral. 51. Lacinial palm, detail. 52. Right mandible. 53. Left mandible. 54. Male terminalia, lateral. 55. Male terminalia, detail.