Corethrella (Borkent, 2008)

Almeida, Jessica Feijó, Picelli, Amanda Maria, Ramires, Adriane Costa, Belchior, Heliana Christy Matos, Marialva, Eric Fabrício, Lima, Hannah Inêz Monteiro Moreira, Ríos-Velásquez, Claudia María & Pessoa, Felipe Arley Costa, 2021, Description of three new species of frog biting midges (Diptera: Corethrellidae) from the Central Brazilian Amazon, European Journal of Taxonomy 778, pp. 148-166 : 162-163

Identification key to female Amazon basin species of Corethrella .

The species C. maculata Lane, 1939 , C. shannoni Lane, 1939 and C. munteantaroku Amaral, Mariano & Pinho, 2019 are not included as females of these species have not been described yet.

1. Wing plain or mostly plain ..............................................................................................................2

– Wing with distinct banding............................................................................................................... 9

2. Wing completely plain....................................................................................................................... 3

– Mostly plain, with very light poorly defined midlength band, anterior margin of wing uniformly pigmented .......................................................................................................... C. blanda Dyar, 1928

3. Tergites II–VIII with most of the posterior portion with dark band, tergites I, IX probably uniformly light brown........................................................................................................ C. alticola Lane, 1989

– Abdominal tergites uniformly pigmented.......................................................................................... 4

4. Palpus pale; clypeus with 1 seta .............................................................. C. unisetosa Borkent, 2008

– Palpus darker, clypeus with one or more than one seta ..................................................................... 5

5. Thorax light brown. Scutum light brown with lateral vitta distinctly dark brown ............................. ......................................................................................... C. manaosensis (Lane & Cerqueira, 1958)

– Thorax medium to dark brown .......................................................................................................... 6

6. Thorax almost uniformly medium to dark brown but with the scutellum lighter laterally and with a median, longitudinal, dark stripe ....................................................................................................... 7

– Scutellum without a median, longitudinal, dark stripe ...................................................................... 8

7. Antennal flagellomere I–II pale, abdomen light brown, with sternite II darker.................................. ......................................................................................................................... C. tarsata Lane, 1942

– Antenna uniformly brown, abdomen with segments medium brown ....... C. redacta Borkent, 2008

8. Thorax uniformly dark brown contrasting with a pale halter, the midfemur with darker pigmentation at its base, and hind leg femur and tibia uniformly pigmented .................. C. peruviana Lane, 1939

– Thorax uniformly medium brown, the halter as dark as the scutellum, with flagellomeres I–III elongate, foretrochanter pale and contrasting with dark forefemur.......... C. amazonica Lane, 1939

9. Wing with four transverse bands ..................................................................................................... 10

– Wing with three or at least one band ..............................................................................................12

10. Halter dark brown (similar to the scutellum)............... C. quadrivittata Shannon & Del Ponte, 1928

– Halter pale or light brown (lighter than the scutellum) ..................................................................11

11. Abdomen and cercus medium brown ................................................................. C. vittata Lane, 1939

– Abdomen dark brown with, in some, segments VIII, IX slightly darker, cercus dark brown............. ....................................................................................................................... C. edwardsi Lane, 1942

12. Wing with basal and midlength band of dark scales.............................................. C. menini sp. nov.

– Wing without basal band but with a discreet or well-developed midlength and dark scales .........13

13. Two large setae on frons between ventromedial area of ommatidia...............................................14

– Up to four large setae on frons between ventromedial area of ommatidia .....................................24

14. Flagellomeres I and II short with flagellomere I nearly globular, flagellomere III elongate............... ..................................................................................................................... C. bicolor Borkent, 2008

– Flagellomeres I–III otherwise.......................................................................................................... 15

15. Thorax dark brown, halter and scutellum equally dark brown ........................................................ 16

– Thorax dark brown, halter pale, much lighter than scutellum ........................................................ 18

16. Midfemur and hind tibia uniformly dark brown........................................... C. travassosi Lane, 1942

– Midfemur dark brown, base of hind tibia pale, similar to the apex of hind femur ......................... 17

17. Flagellomeres IX–XIII each with one sensillum coeloconicum........ C. ranapungens Borkent, 2008

– Flagellomeres IX–XII each with two sensilla coeloconica ..................... C. incompta Borkent, 2008

18. Primarily medium to dark brown palpus ......................................................................................... 19

– Primarily pale or light brown palpus ............................................................................................... 20

19. Clypeus wide, few setae (less than 5) .................................................... C. fuscipalpis Borkent, 2008

– Clypeus elongate, more than 5 to 10 setae .............................. C. puella Shannon & Del Ponte, 1928

20. Flagellomere III without a sensillum coeloconicum........................................................................ 21

– Flagellomere III with a sensillum coeloconicum............................................................................. 23

21. Presence of 2 sensilla coeloconica on flagellomeres X–XII........................ C. ananacola Dyar, 1926

– Absence of 2 sensilla coeloconica on flagellomeres X–XII ............................................................ 22

22. Coronal suture short.............................................................................. C. dicosimoae Borkent, 2008

– Coronal suture elongate ................................................................. C. melanica Lane & Aitken, 1956

23. Coronal suture elongate, extending ventrally past ommatidia............................... C. inca Lane, 1939

– Coronal suture short, extending ventrally about midway along the area between ommatidia ....................................................................................................... C. selvicola Lane, 1939

24. Clypeus squarish, with more than 10 setae........................................................... C. ielemdei sp. nov.

– Clypeus wide, with up to four setae................................................................................................. 25

25. Thorax with a group of eight setae.................................................. C. appendiculata Grabham, 1906

– Thorax with a group of five to six setae .......................................................................................... 26

26. Legs without any well-defined pigmentation pattern (hind tibia slightly darker apically and hind femur slightly less pigmented distally ...................... C. yanomami Amaral, Mariano & Pinho, 2019

– Legs with any well-defined pigmentation pattern ........................................................................... 27

27. Antenna with flagellomere I and II dark brown and the others light brown; flagellomere I with four sensilla; scutum and scutellum medium brown; abdomen entirely dark brown.... C. cabocla sp. nov.

– Antenna with flagellomere I–IV light brown and V–XIII progressively dark; flagellomere I with 2 sensilla; scutum and scutellum light to medium brown; abdomen light brown to medium with segments VIII and IX darker ......................................................................... C. lepida Borkent, 2008