Sweltsa Larvae

Stark, Bill P., Kondratieff, Boris C., Kirchner, Ralph F. & Stewart, Kenneth W., 2011, Larvae Of Eight Eastern North American Sweltsa (Plecoptera: Chloroperlidae), Illiesia 7 (4), pp. 51-64 : 63

Provisional Key to Eastern Nearctic Sweltsa Larvae

( S. holstonensis and S. voshelli unknown)

1 Tibial fine fringe setae sparse and about half as long as median outer marginal seta ( Fig. 3 ) …… 2

1’ Tibial fine fringe setae more abundant and about as long as median outer marginal seta ( Fig. 23 ) 6

2 Metanotal wingpads with less than five intercalary setae ( Fig. 2 ) …………………………. 3

2’ Metanotal wingpads with at least 10 intercalary setae ( Fig. 37 ) ………………….…………………. 4

3 Tergum 10 bearing 2 intercalary setae ( Fig. 4 ) …………………………….…….….……… hoffmani

3’ Tergum 10 without intercalary setae ( Fig. 29 ) …………………………………………….. palearata

4 Tergum 10 bearing ca. 10- 12 intercalary setae in two lateral clusters ( Fig. 39 ) ……….…..… urticae

4’ Tergum 10 usually with at most, two intercalary setae ( Fig. 9 ) ……………………….………..…… 5

5 Longest dorsal cercal setae on ca. segment 12 subequal in length to two cercal segments ( Fig. 10 ).…………………………………………. lateralis

5’ Longest dorsal cercal setae about as long as 1.5 cercal segments ( Fig. 35 ) ..…………….. pocahontas

6 Longest dorsal cercal setae about as long as 1.2-1.5 cercal segments ( Fig. 15 ) ………..……….. mediana

6’ Longest dorsal cercal setae subequal in length to two cercal segments ( Fig. 25 ) ..………………….. 7

7 Abdominal terga dark brown, occiput about as dark as frons ( Fig. 21 ); meso and metanota rather densely covered with long, dark clothing hairs ……………………………………………..….. onkos

7’ Abdominal terga pale brown, occiput almost entirely pale ( Fig. 16 ); meso and metanota with sparse brown clothing hairs …………………. naica

Figures

Figs. 1-5. Sweltsa hoffmani larval structures. 1. Head and pronotum. 2. Mesonotum and metanotum. 3. Right foreleg (m = median outer tibial seta). 4. Abdominal terga 8-10. 5. Lateral aspect of cercus, dorsum left.

Figs. 21-25. Sweltsa onkos larval structures. 21. Head and pronotum. 22. Mesonotum and metanotum. 23. Right foreleg. 24. Abdominal terga 8-10. 25. Lateral aspect of cercus, dorsum left.

Figs. 36-40. Sweltsa urticae larval structures. 36. Head and pronotum. 37. Mesonotum and metanotum. 38. Right foreleg. 39. Abdominal terga 8-10. 40. Lateral aspect of cercus, dorsum left.

Figs. 26-30. Sweltsa palearata larval structures. 26. Head and pronotum. 27. Mesonotum and metanotum. 28. Right foreleg. 29. Abdominal terga 8-10. 30. Lateral aspect of cercus, dorsum left.

Figs. 6-10. Sweltsa lateralis larval structures. 6. Head and pronotum. 7. Mesonotum and metanotum. 8. Right foreleg. 9. Abdominal terga 8-10. 10. Lateral aspect of cercus, dorsum left.

Figs. 31-35. Sweltsa pocahontas larval structures. 31. Head and pronotum. 32. Mesonotum and metanotum. 33. Right foreleg. 34. Abdominal terga 8-10. 35. Lateral aspect of cercus, dorsum left.

Figs. 11-15. Sweltsa mediana larval structures. 11. Head and pronotum. 12. Mesonotum and metanotum. 13. Right foreleg. 14. Abdominal terga 8-10. 15. Lateral aspect of cercus, dorsum left.

Figs. 16-20. Sweltsa naica larval structures. 16. Head and pronotum. 17. Mesonotum and metanotum. 18. Right foreleg. 19. Abdominal terga 8-10. 20. Lateral aspect of cercus, dorsum left.