Corethrella

Amaral, André P. & Pinho, Luiz Carlos, 2015, New species and records of frog-biting midges from southern Brazil (Diptera: Corethrellidae), Zootaxa 3946 (2), pp. 274-284 : 283

Key to known pupae of Corethrella gr. peruviana

1. Respiratory organ elongate and somewhat cylindrical with variably expanded apex ( Fig. 17 ; Borkent 2008, fig. 101 A, F–I, fig. 102 and 103) but never broad and flattened. Metathorax with or without sensory pits. Terminal process with socketed spines ( Borkent 2008, fig. 100A, B, C)................................................................... Not keyed

1’. Respiratory organ broad and flattened ( Fig. 23 ; Borkent 2008, fig. 101B–E). Metathorax without sensory pits. Terminal pro- cess without socketed spines ( Borkent 2008, fig. 100D)......................................... peruviana group... 2

2. Abdominal segments strongly expanded laterally, with sharp extremities ( Fig. 22 ; Borkent 2008, fig. 104C, D)........... 3

2’. Abdominal segments at most slightly expanded laterally ( Borkent 2008, fig. 105A)................................. 6

3. L-4 well developed and inserted at apex of abdominal lateral expansions, as long as or longer than the expansions ( Borkent 2008, fig. 104C, D)................................................................................... 4

3’. L-4 short and not inserted at apex of abdominal lateral expansions ( Fig. 24 ).................................. alticola

4. Anterior branch of respiratory organ longer than wide ( Borkent 2008, fig. 101D, E)................................. 5

4’. Anterior branch of respiratory organ as long as wide ( Borkent 2008, fig. 101C).............................. inornata

5. Outer margins of anterior and lateral branches of respiratory organ nearly straight, and oblique to each other ( Borkent 2008, fig. 101E)....................................................................................... blanda

5’. Area between anterior and lateral branches of respiratory organ forming nearly a semicircle ( Borkent 2008, fig. 101D)..................................................................................................... pallida

6. Abdominal segments not expanded laterally. Terminal process relatively short ( Borkent 2008, fig. 101C)............ davisi

6’. Abdominal segments somewhat expanded laterally. Terminal process relatively long ( Borkent 2008, fig. 101E, 105A).................................................................................................. manaosensis

Figures

FIGURES 16 – 21. Corethrella borkenti sp. n., pupa (16 – 18) and larva (19 – 21). 16. Pupal exuviae, dorsal view. 17. Right respiratory organ. 18. Metathorax and abdomen, tergites to the left, sternites to the right. 19. Larval head capsule, ventral view. 20. Right mandible, dorsal view. 21. Mentum.

FIGURES 22 – 28. Corethrella alticola Lane, 1939, pupa (22 – 24) and larva (25 – 28). 22. Pupal exuviae, dorsal view. 23. Left respiratory organ. 24. Metathorax and abdomen, tergites to the left, sternites to the right. 25. Right mandible, dorsal view. 26. Larval head capsule, ventral view. 27. Mentum. 28. Siphon, lateral view.