Conchopus rectus

Masunaga, Kazuhiro & Saigusa, Toyohei, 2010, A revision of the Hawaiian and Wake Island species of the genus Conchopus Takagi (Diptera, Dolichopodidae), Zootaxa 2729, pp. 1-35 : 4

Key to species of the rectus group of Conchopus Takagi (males)

1. Middle section of M1+2 not thickened ( Figs. 18 a,b)........................................................... 2

- Middle section of M1+2 thickened ( Figs. 18 c–f)............................................................. 4

2. Middle tarsomere 1without remarkably long anterior fine setae ( Fig. 19 a)......................................... 3

- Middle tarsomere 1with remarkably long fine anterior setae ( Japan, China).............................. rectus Takagi

3. Basal lobe of fore tarsomere 1 with 3–4 rather long marginal setulae ( Figs. 1 a,b); ventral lobe as long as cercus, distinctly extended ventrally beyond tip of cercus ( Fig. 3 a) (Hawai‘i, Maui, Lāna‘i, Moloka‘i)................ acrosticalis (Parent)

- Basal lobe of fore tarsomere 1 with 4–5 rather short marginal setulae ( Figs. 4 a,b); ventral lobe shorter than 2/3 length of cercus ( Figs. 6 a,b) (Hawai‘i, Maui, O‘ahu, Lisianski).................................................. ciliatus sp. nov.

4. Middle tibia and tarsomere 1 with remarkably long anterior setae ( Fig. 19 b)...................................... 5

- Middle tibia and tarsomere 1 without remarkably long anterior setae............................................ 6

5. Ventral bristle of fore tarsomere 1 weak ( Figs. 7 a,b) (Kaua‘i)................................... crassinervis sp. nov.

- Ventral bristle of fore tarsomere 1 strong ( Japan, N. America, Peru)............................ borealis Takagi, 1965

6. Fore tarsomere 1 without strong ventral bristle ( Japan)..................................... sikokianus Takagi, 1965

- Fore tarsomere 1 with strong ventral bristle................................................................ 7

7. Ventral bristle of fore tarsomere 1situated 1/3 of way from base ( Figs. 13 a,b) (Kaua‘i, Nihoa).......... menehune sp. nov.

- Ventral bristle of fore tarsomere 1 situated halfway from base................................................. 8

8. Fore tarsomere 1 with raised keel ciliated with 2–4 setulae between basal lobe and ventral bristle ( Figs. 15 a,b) (Hawai‘i, O‘ahu, Kaua‘i, Wake)................................................................... .. pacificus sp. nov.

- Fore tarsomere 1 without raised keel between basal lobe and ventral bristle ( Figs. 10 a,b)............................ 9

9. Discal crossvein strongly oblique ( Fig. 18 d) (Hawai‘i, Maui, Lāna‘i, Moloka‘i, O‘ahu, French Frigate Shoals)................................................................................................... minutus sp. nov.

- Discal crossvein slightly oblique........................................................................ 10

10. First flagellomere 1.5 times as long as wide, fore tarsomere 2 with two or more erect anterodorsal bristles ( Japan, Taiwan).................................................................................... taivanensis Takagi, 1967

- First flagellomere 2.0 times as long as wide, fore tarsomere 2 with one erect anterodorsal bristle ( Japan)...................................................................................................... pudicus Takagi, 1965

Figures

FIGURE 1. Conchopus acrosticalis (Parent), legs of male: (a) left fore leg in posterior view; (b) distal part of tibia, tarsal segments 1 – 2 of right fore leg in anterior view; (c) left middle femur in anterior view.

FIGURE 3. Conchopus acrosticalis (Parent), male genitalia: (a) hypopygium; b, ventral lobe; c, cercus; d, hypandrium in lateral view; e, hypandrium in dorsal view.

FIGURE 4. Conchopus ciliatus sp. nov., legs of male: (a) left fore leg in posterior view; (b) distal part of tibia, tarsal segments 1 – 2 of right foreleg in anterior view; c, left middle femur in anterior view.

FIGURE 6. Conchopus ciliatus sp. nov., male genitalia: (a) hypopygium; (b) ventral lobe; (c) cercus; (d) hypandrium in lateral view; (e) hypandrium in dorsal view.

FIGURE 7. Conchopus crassinervis sp. nov., legs of male: (a) distal part of tibia, tarsal segments 1 – 2 of left foreleg in posterior view; (b) right foreleg in anterior view; (c) left middle femur in anterior view.

FIGURE 10. Conchopus minutus sp. nov., legs of male: (a) left foreleg in posterior view; (b) distal part of tibia, tarsal segments 1 – 2 of right foreleg in anterior view; (c) left middle femur in anterior view.

FIGURE 13. Conchopus menehune sp. nov., legs of male: (a) distal part of tibia, tarsal segments 1 – 2 of left foreleg in posterior view; (b) right foreleg in anterior view.

FIGURE 15. Conchopus pacificus sp. nov., legs of male: (a) left foreleg in posterior view; (b) distal part of tibia, tarsal segments 1 – 2 of right foreleg in anterior view; (c) left middle femur in anterior view.

FIGURE 18. Male wings of species of Conchopus: (a) Conchopus acrosticalis (Parent); (b) Conchopus ciliatus sp. nov.; (c) Conchopus crassinervis sp. nov.; (d) Conchopus minutus sp. nov.; (e) Conchopus menehune sp. nov.; (f) Conchopus pacificus sp. nov.

FIGURE 19. Male left middle tibia and tarsal segment 1, dorsal aspect legs: (a) Conchopus ciliatus sp. nov.; (b) Conchopus crassinervis sp. nov.