Capnia ventura 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 : 175-178

Capnia ventura Nelson & Baumann 1987

( Figs. 12-14 , 50-55 , 60, 61 )

Distribution. California.

Material examined. California: Orange Co., Silverado Creek, Silverado Canyon , concrete low water crossing about 4.67km above Forest Service Fire Gate , N 33 ° 44.43 ’ W 117 ° 32.44 ’, 6-IV-2004, K.W. Stewart and E.F. Drake, 4♂, 7♀, 5♂ larval exuviae, 10♀ larval exuviae (adults and exuviae all together on a floating board), 11♀ larvae. Silverado Creek , 91.4m above Forest Service Fire Gate, 574.5m Elev., N 33 ° 44.55 ’ W 117 ° 34.56 ’, 9-II-2005, E.F. Drake, 2♂, 4♂ larvae, 23♀ larvae. Same locality, 10-III-2005, E.F. Drake, 1♂ larva, 9♀ larvae. Same locality, 25-III-2005, E.F. Drake, 1♂ larva, 6♀ larvae. Same locality, 18-II- 2006, E.F. Drake, 3♂ reared with exuviae, 4♀ reared with exuviae. Same locality, 20-22-II-2006, 2♂, 3♀ .

Characters. Body length ♂ 6.4-7.0mm, ♀ 7.2-7.3mm. Light to medium brown dorsally, ventrum lighter, little pattern except underlying muscles or adult pigment. Antennal segments ♂ 48-50, ♀ 48-52, head capsule width ♂ 0.75-0.81mm, ♀ 0.78-0.90mm. Lacinia triangular, palmate with longitudinally striate palm surface, broad apical teeth, ventral comb of about 10 bristles and dorsal comb of 16-18 longer bristles ( Figs. 50, 51 ). Right mandible with apical teeth, molar pad of dense stiff bristles, and inner band of hairs from base of apical teeth to molar pad ( Fig. 52 ). Left mandible with molar cup bordered by outer (dorsal) comb of curved teeth ( Fig. 53 ). Pronotum with scattered setae over surface and as a marginal fringe (like Fig. 1 ). Mesosternal Y-arms and shallowly notched hind wingpads typical of genus; inside fore wingpad length ♂ 0.90-0.96mm, ♀ 1.02- 1.08mm. Leg setation typical of genus (like Figs. 2, 3 ). Abdominal segments with long surface and posterior fringe hairs ( Fig. 57 ). Sexual dimorphism evident. Male with posterior extension of 10 th tergum nippleshaped in dorsal view with underlying developing tubular epiproct visible in pharate individuals ( Fig. 12 ); 10 th tergum in lateral view with emarginated sides, cross-striated basal half, and narrowing apically ( Figs. 54, 55 ). Female without posterior extension of 10 th tergum ( Fig. 13 ). Cercal segments ♂ 30-32, ♀ 32; cercomeres with apical circlet of short and long bristles, longer dorsal and ventral bristle in lateral view, and no intercalary hairs ( Figs. 60, 61 ).

Figures

Figs. 1-14. Capnia larval characters. C. coyote: 1. Head, pronotum, dorsal. 2. Left front leg, dorsal. 4. Pharate male terminalia, dorsal. 7. Female terminalia, dorsal. 8. Male terminalia, lateral. C. teresa: 3. Right front leg, dorsal. 5. Partially emerged male in exuvium, lateral. 6. Male terminalia, lateral. 9. Cercus, lateral. C. umpqua: 10. Male terminalia, lateral. 11. Male terminalia, ventral. C. ventura: 12. Pharate male terminalia, dorsal. 13. Female terminalia, dorsal. 14. Cercus, 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.

Figs. 56-61. Capnia larval characters. C. umpqua. 56. Abdominal tergum 9. 57. Abdominal sternum 9. 58. Cercomeres 9, 10. 59. Cercomere 19. C. ventura. 60. Cercomeres 3-6. 61. Cercomere 10.