Allocapnia Claassen, 1928

Nations, Tina M., Stark, Bill P. & Hicks, Matthew B., 2007, The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi, Illiesia 3 (9), pp. 70-94 : 72-73

Genus Allocapnia Claassen, 1928

Type species. Allocapnia granulata (Claassen)

Distribution. An eastern Nearctic endemic genus found from the southern Maritime Provinces of Canada to the Gulf Coastal States and westward to the Wichita Mountains of Oklahoma and the eastern countiesof the Dakotas (Kirchner et al. unpublished). Diversity. Allocapnia currently includes 44 species ( Stark & Baumann 2006) with seven recognized for Mississippi. The following keys modified from Kirchner et al. (unpublished) will assist in the identification of adult specimens. Most Mississippi nymphal specimens can be identified using Stark & Lacey (2005).

Key to Adult Mississippi Allocapnia

(Modified from Kirchner et al. unpublished)

1 Tip of abdomen bearinga dorsalepiproct (Figs. 4‐ 5), and a dorsal process on abdominal segment 8 (Fig. 7); wings not reaching tip of abdomen ……………………………………………… males (2)

1’ Tip of abdomen without dorsal epiproct and process on tergum 8, butwith a conspicuous pale, unsclerotized dorsal band extending from abdominalbase to segment 8; abdominalsternum 8 modified to form a small subgenital plate (Fig. 9); wings usually reaching almost to, or slightly beyond tip of abdomen …………….... females (8)

2 Tergal process on segment 8 with a wide, conspicuous notch ( Fig. 14 ) ……………………... 3

2’ Tergal process on segment 8 without notch ( Fig. 28 ), or with a narrow inconspicuous notch ( Fig. 21 ) ………………………………………………… 5

3 Tergum 8 with a small membranous, hairy knob located posterolaterad of each lobe of dorsal process ( Figs. 12‐14 ) …………………… granulata

3’ Tergum 8 without membranous hairy knob behind lobes of dorsal process …………………. 4

4 Dorsal process of tergum 8 more or less chair shaped in lateral aspect; notch moderately deep but not extending to level of tergum 7 (Figs. 5, 7) ………………………………………………… aurora

4’ Dorsal process of tergum 8 not chair shaped in lateral aspect; notch of process deep, extending to levelof tergum 7 ( Fig. 33, 36 ) ……………… rickeri

5 Dorsalprocessof tergum 8 large, flat, cushion‐ like and bearinga second, small, ridge‐ like processon anterior margin of tergum 8 ( Figs. 49‐50 ; apical segment of epiproct upper limb wide ( Fig. 46 ) ………….…………………………….… virginiana

5’ Dorsal process of tergum 8 variable but not as above; apical segment of epiproct upper limb narrower ( Fig. 18 ) ……………………………….. 6

6 Dorsal process of tergum 8 with a narrow notch ( Fig. 21 ) ……………………….…………… mystica

6’ Dorsalprocessof tergum 8 withoutnotch ( Fig. 28 ) ……………………………………………………... 7

7 Anterior margin of dorsal process of tergum 8 bent abruptly near apex in lateral aspect ( Fig. 29 ); dorsal aspect of 8 th tergal process a thin, almost straight, transverse ridge ( Fig. 28 ) ……. polemistis

7’ Anterior margin of dorsalprocessof tergum 8 not bent ( Fig. 43 ); dorsal aspect of 8 th tergal process U or V‐ shaped ………………………………….. starki

8 Abdominal sterna 7 and 8 at least partially fused by a distinct transverse sclerotized area (Figs. 9, 37) …………………………………………………. 9

8’ Abdominal sterna 7 and 8 separated by membrane ( Fig. 16 ) …………………………….. 10

9 Sclerotized bridge between abdominal sterna 7 and 8 with conspicuous lateral membranous notches ( Figs. 37 , 63 ) ………………………. rickeri

9’ Sclerotized bridge between abdominal sterna 7 and 8 folded under posterior margin of sternum 7 forming a thin, dark line without lateral notches (Figs. 9, 59) ………………………………….. aurora

10 Projectingsubgenitalplatewithsmallbasolateral notches ( Figs. 16 , 60 ) …..……………..… granulata

10’ Subgenital plate, if projecting, without basolateral notches ( Fig. 30 ) ……………………………….… 11

11 Subgenital platescarcely projecting beyondlateral margins of sternum 8 ( Figs. 30 , 62 ); known from Tishomingo Co ………………….……… polemistis

11’ Subgenital plate at least slightly projecting beyond lateral margins of sternum 8 ( Fig. 44 ); found more or less statewide ………………….. 12

12 Subgenital plate broadly arcuate ( Figs. 51 , 65 ) ……………………….…………………… virginiana

12’ Subgenital platenarrow ( Fig. 44 ) ………….…... 13

13 Base of subgenital plate with a pair of small, mesal lobes ( Fig. 64 ) ..………………….……. starki

13’ Base of subgenital plate without small, mesal lobes ( Fig. 61 ) ……………………….……… mystica

Figures

Figs. 11‐16. Allocapnia granulata, Noxubee Co., Shuqualak Creek, Hwy 45. 11. Epiproct, dorsal, 12. Epiproct, lateral, 13. Epiproct tip, 14. Male tergum 8 and dorsal process, 15. Male tergum 8, lateral aspect, 16. Female abdominal sterna 7‐9.

Figs. 25‐30. Allocapnia polemistis, Tishomingo Co., Rock Quarry Creek, Tishomingo State Park. 25. Epiproct, dorsal, 26. Epiproct, lateral, 27. Epiproct tip, 28. Male tergum 8 and dorsal process, 29. Male tergum 8, lateral aspect, 30. Female abdominal sterna 7‐9.

Figs. 18‐23. Allocapnia mystica, Webster Co., Line Creek, Hwy 15. 18. Epiproct, dorsal, 19. Epiproct, lateral, 20. Epiproct tip, 21. Male tergum 8 and dorsal process, 22. Male tergum 8, lateral aspect, 23. Female abdominal sterna 7‐9.

Figs. 32‐37. Allocapnia rickeri, Tishomingo Co., Clear Creek, Hwy 172. 32. Epiproct, dorsal, 33. Epiproct, lateral, 34. Epiproct tip, 35. Detail epiproct tip, 36. Male tergum 8 and dorsal process, 37. Female abdominal sterna 7‐9.

Figs. 46‐51. Allocapnia virginiana, Tishomingo Co., Little Cripple Deer Creek, CR 957. 46. Epiproct, dorsal, 47. Epiproct, lateral, 48. Epiproct tip, 49. Male tergum 8 and dorsal process, 50. Male tergum 8, lateral aspect, 51. Female abdominal sterna 7‐9.

Figs. 39‐44. Allocapnia starki, Noxubee Co., Macedonia Creek, Hwy 45. 39. Epiproct, dorsal, 40. Epiproct, lateral, 41. Epiproct tip, 42. Male tergum 8 and dorsal process, 43. Male tergum 8, lateral aspect, 44. Female abdominal sterna 7‐9. January 1977, B. Stark, 1 ♂; Owens Creek tributary, Curtis‐Lester Road, 32° 05’ 14.4” N, 90° 44’ 27.7” W,

Figs. 63‐66. Female terminalia. 63. Allocapnia rickeri, 64. Allocapnia starki, 65. Allocapnia virginiana, 66. Nemocapnia carolina.

Figs. 59‐62. Female terminalia. 59. Allocapnia aurora, 60. Allocapnia granulata, 61. Allocapnia mystica, 62. Allocapnia polemistis. fl = fusion line; sgp = subgenital plate.