Capniidae

Stark, Bill P. & Lacey, Joe W., 2005, Larvae Of The Winter Stonefly Genus Allocapnia (Plecoptera: Capniidae) In Mississippi, Usa, Illiesia 1 (3), pp. 10-20 : 19-20

Provisional Key for Larval Mississippi Capniidae

( A. polemistis unknown)

1. Apical cercal segments with vertical fringe of bristles along dorsal and ventral margins of each segment…………………….……. Nemocapnia carolina

Apical cercal segment with terminal bristle whorls on each segment, vertical fringe absent ( Figs. 11-12 )……………………..……….……… Allocapnia , 2

2. Erect bristles, seen in lateral aspect, restricted to posterior margins of most abdominal terga ( Fig. 6 ) ……………………………………………….…..……..3

Lateral aspect of most abdominal terga with an additional erect or semi-erect bristle, or bristles, near midlength ( Fig. 32 ) …………………………………..4

3. Posterolateral aspect of developing male 10 th tergal margin truncate, dorsal margin straight ( Fig. 15 ) ……..……………………………….…… A. mystica

Posterolateral aspect of developing male 10 th tergal margin slanted, dorsal margin with pre-apical elevation ( Fig. 5 ) …………………………….. A. aurora

4. Posterolateral aspect of developing male 10 th tergum bent upward in apical third; lobe portion of tergum 10 distal to cercal bases about twice as long as tergum proximal to cercal bases; longest erect tergal bristles about half as long as tergum ..….… A. rickeri

Lateral aspect of developing male 10 th tergum straight on dorsum; lobe portion of tergum 10 distal to cercal bases no more than 1.5 times as long as tergum proximal to cercal bases; longest erect tergal bristles about 1/3 as long as tergum ….…………….5

5. Lateral aspect of developing male 10 th tergum slanted along posterior margin ( Fig. 31 ); longest tergal bristles almost half as long as tergum ( Fig. 32 ) …..………………………..………………. A. virginiana

Lateral aspect of developing male 10 th tergum almost truncate apically ( Fig. 21 ); longest tergal bristles about 1/3 as long as tergum ( Fig. 22 ).…….6

6. Erect and semi-erect tergal bristles irregularly distributed along tergal length ………... A. granulata

Erect and semi-erect tergal bristles restricted to apical and midlength positions ( Fig. 22 ). A. starki

Figures

Figs. 7-12. Allocapnia mystica. 7. Male epiproct. 8. Apex of epiproct. 9. Male 8th tergal process. 10. Larval left metanotal wingpad. 11. Basolateral aspect of larval cercal segments. 12. Apicolateral aspect of larval cercal segments.

Figs. 1-6. Allocapnia aurora. 1. Male terminalia. 2. Apex of epiproct. 3. Ventral aspect of larval head. 4. Ventral aspect of left galea. 5. Lateral aspect of larval male 10th tergum and basal cercal segments. 6. Lateral aspect of abdominal terga 8-9. (Ep = epiproct, Ga = galea, Gl = glossa, Lp = labial palp, Mp = maxillary palp, Pg = paraglossa)

Figs. 27-32. Allocapnia virginiana. 27. Ventral aspect of larval head. 28. Ventral aspect of left galea. 29. Ventral aspect of larval mouthparts showing labral setal tufts. 30. Labral setal tufts. 31. Lateral aspect of larval male 10th tergum and basal cercal segments. 32. Lateral aspect of abdominal terga 7-9. (ETB = erect tergal bristle, Ga = galea, Gl = glossa, Lc = lacinia, Lp = labial palp, Mp = maxillary palp, Pg = paraglossa)

Figs. 13-16. Allocapnia mystica. 13. Ventral aspect of larval head. 14. Ventral aspect of left galea. 15. Lateral aspect of larval male 10th tergum and basal cercal segments. 16. Lateral aspect of abdominal terga 6-7. (Ga = galea, Gl = glossa, Lc = lacinia, Lp = labial palp, Mp = maxillary palp, Pg = paraglossa)

Figs. 17-22. Allocapnia starki. 17. Male terminalia. 18. Apex of epiproct. 19. Ventral aspect of larval head. 20. Ventral aspect of left galea. 21. Lateral aspect of larval male 10th tergum and basal cercal segments. 22. Lateral aspect of abdominal tergum 8. (ETB = erect tergal bristle, Ga = galea, Gl = glossa, Lc = lacinia, Lp = labial palp)