Alloperla

Stark, Bill P. & Kondratieff, Boris C., 2010, Larvae Of Eight Eastern Nearctic Alloperla Species (Plecoptera: Chloroperlidae), Illiesia 6 (20), pp. 267-276 : 274-276

Preliminary Key to Larvae of Nine Eastern Nearctic Alloperla

1 Vertical cercal fringe poorly developed, sparse on ventral margin and obsolete or absent on dorsal margin ( Fig. 25 ); anterolateral margins of frons slightly slanted, angulate from base of frontoclypeus to labrum ( Fig. 21 ) ….…….. A. usa

1’ Vertical cercal fringe well developed on dorsal and ventral margins of several mid to apical segments ( Fig. 5 ); anterolateral margins of frons smoothly rounded between frontoclypeus and labrum ( Fig. 1 ) ………………………..…………. 2

2 Twelve or 13 cercal segments ( Fig. 15 ); Coastal Plains populations generally found south of Jackson, Tuscaloosa, Atlanta line ………………. 3

2’ At least 14 cercal segments ( Fig. 20 ); populations found mostly north of Jackson, Tuscaloosa, Atlanta line ……………………………………….. 5

3 Thirteen cercal segments; ventral fringe on foretibiae absent; abdominal terga without mesal pair of pale spots; known from central and southwest Mississippi …………………. A. natchez

3’ Twelve cercal segments ( Fig. 15 ); sparse ventral fringe of fine setae on foretibiae ( Fig. 14 ).……. 4

4 Abdominal terga with a pair of pale, round spots ( Fig. 13 ); known from South Carolina … A. furcula

4’ Abdominal terga without pale, round spots; known from Alabama and Florida … A. prognoides

5 Posterior pronotal fringe consists of two rather widely spaced long setae at corners ( Fig. 16 ) ….. 6

5’ Posterior pronotal fringe consists of 1 or 2 short setae placed between longer setae at corners ( Fig. 6 ) …………………………………………………… 7

6 Vertical cercal fringe begins on segment 10 ( Fig. 20 ); less than 10 outer marginal setae present on mesonotum ( Fig. 17 ) ………..……….. A. imbecilla

6’ Vertical cercal fringe begins on segment 12 ( Fig. 5 ); at least 10 outer marginal setae present on mesonotum ( Fig. 2 ) ……………………. A. atlantica

7 Mid fringe setae on abdominal terga 8-9 similar to those located just laterad to innermost long thin setae; mesonotum with about 8 outer marginal setae; vertical cercal fringe begins on segment 9 …………………………………..………. A. petasata

7’ Mid fringe setae on abdominal terga 8-9 much thinner and more widely spaced than those located laterad to innermost long thin setae ( Fig. 8 ); mesonotum with about 4 or with about 12 outer marginal setae; vertical cercal fringe begins beyond segment 10 ……………………………….. 8

8 Vertical cercal fringe setae begin on segment 11 ( Fig. 10 ); mesonotum with about 12 outer marginal setae ( Fig. 7 ) …………………. A. concolor

8’ Vertical cercal fringe setae begin on segment 13; mesonotum with about 4 outer marginal setae ………………………….………………… A. neglecta

Figures

Figs. 21-25. Alloperla usa larval structures. 21. Head and pronotum. 22. Mesonotum and metanotum. 23. Abdominal terga 8-9. 24. Right foreleg. 25. Lateral aspect of cercus, dorsum left.

Figs. 1-5. Alloperla atlantica larval structures. 1. Head and pronotum. 2. Mesonotum and metanotum. 3. Abdominal terga 8-9. 4. Right foreleg. 5. Lateral aspect of cercus, dorsum left.

Figs. 11-15. Alloperla furcula larval structures. 11. Head and pronotum. 12. Mesonotum and metanotum. 13. Abdominal terga 8-9. 14. Right foreleg. 15. Lateral aspect of cercus, dorsum left.

Figs. 16-20. Alloperla imbecilla larval structures. 16. Head and pronotum. 17. Mesonotum and metanotum. 18. Abdominal terga 8-9. 19. Right foreleg. 20. Lateral aspect of cercus, dorsum left.

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