Cymatopus Kertész

Masunaga, Kazuhiro & Evenhuis, Neal L., 2012, Two new species of the genus Cymatopus Kertész from the Mariana Islands (Diptera: Dolichopodidae), Zootaxa 3159, pp. 36-46 : 37-38

Key to species of Cymatopus Kertész (males)

This key is based on that of Evenhuis (2005), but modified and updated by the inclusion of subsequently discovered species.

1 Fore coxa covered with stiff bristles on anterior surface....................................................... 5

- Fore coxa only covered with fine setae on anterior surface..................................................... 2

2 Fore femur with 3 rather long, flattened, basoventral setae.............................................. C. setosus

- Fore femur without flattened, basoventral setae.............................................................. 3

3 R4+5 curved slightly but distinctly backward at tip.................................................... C. bredini

- R4+5 not curved backward at tip........................................................................... 4

4 Fore femur with only 5–6 longer setae anteroventrally............................................. C. cheesmanae

- Fore femur with only 2–3 longer setae anteroventrally.................................................. C. wirthi

5 Costa ending at apex of vein M1+2........................................................................ 6

- Costa running around wing ( Madagascar).............................. C. stuckenbergi Grootaert & Grichanov, 2008

6 Wing modified, with deep sulcus on hind margin............................................................ 7

- Wing unmodified in shape............................................................................... 8

7 Hind region of wing distal to sulcus with field of microtrichiae; hind margin of wing with fringe of long hairs; fore tarsomere 1 modified, with almost crook-shaped, semicircular bend in distal half ( Malaysia, Singapore, Thailand)................................................................................................... C. malayensis Parent, 1935

- Hind region of wing distal to sulcus without field of microtrichia; hind margin of wing without fringe; fore tarsomere 1 not modified, distal half straight ( East Timor)......................................... C. othniopteryx Evenhuis, 2005

8 Hypopygium exposed; cercus long, narrow................................................................ 9

- Hypopygium small, concealed in postabdomen; cercus short and other appendages hidden ( Samoa)..................................................................................................... C. spinosus ( Parent), 1934

9 Fore tibia with black foliate bristle on medial surface (cf. Fig. 4 C).............................................. 10

- Fore tibia lacking such a bristle.......................................................................... 13

10 Fore tibia with long apical lobe (cf. Fig. 4 D); fore tarsomere 4 excavated ventrally with basal and apical lobes (cf. Fig. 4 F)...................................................................................................... 11

- Fore tibia with short apical lobe; fore tarsomere 4 not excavated ventrally ( Malaysia, Thailand)............................................................................................... C. thaicus Grootaert & Meuffels, 2001

11 Fore tarsomere 5 subequal to or shorter than fore tarsomere 4 (cf. Fig. 4 E)....................................... 12

- Fore tarsomere 5 at least 1.5 times as long as fore tarsomere 4 (New Guinea, Australia)................................................................................................ C calcaratoides Grootaert & Meuffels, 1993

12 Legs yellow, but coxae, femora and tibiae slightly blackened dorsally; cercus very long, 1.5 times as long as height of hypopy- gium (Christmas Is. [Indian Ocean]).................................................. C. calcaratus Parent, 1935

- Legs black; cercus moderately long, 1.1 times as long as height of hypopygium ( Fig. 5 A) (Pagan, Saipan, Rota, Guam)......................................................................................... C. femoralis sp. nov.

13 Middle and hind tibiae with long hairs toward apex (cf. Figs. 6 C,D)............................................ 14

- Middle and hind tibiae without long hairs................................................................ 15

14 Hind tibia with 2–3 short, strong, down-curved thorn-like bristles near middle ( Fig. 6 D) (Saipan, Rota, Guam)................................................................................................. C. ventralis sp. nov.

- Hind tibia lacking such bristles (Christmas Is. [Indian Ocean], Thailand)..................... C. longipilus Parent, 1935

15 Fore tarsomere 4 with comb of long, curved anterodorsal setae ( Papua New Guinea, Solomon Is.).. C. tibialis Kertész, 1901

- Fore tarsomere 4 lacking such a setal comb................................................................ 16

16 Fore tibia with 2–5 strong bristles (not foliate) on medial surface............................................... 17

- Fore tibia lacking such bristles.......................................................................... 19

17 Fore tibia with apical lobe bearing strong black bristle; fore tarsomere 2 with long ventral setae....................... 18

- Fore tibia lacking apical lobe; fore tarsomere 2 without long ventral setae ( Fiji).............. C. baravikai Evenhuis, 2005

18 Fore tibia with bump or swollen area just beyond midpoint on ventral surface; fore tarsomere 2 with 8–9 long ventral bristles ( New Caledonia)........................................................... C. neocaledonicus Evenhuis, 2005

- Fore tibia without swollen area; fore tarsomere 2 with 3 long ventral bristles ( Papua New Guinea, Australia)................................................................................... C. leopoldi Meuffels & Grootaert, 1984

19 Five dorsocentral bristles; fore coxa and all femora yellow; hypopygium symmetrical; surstylus with conspicuous hook-shaped bristle............................................................................................. 20

- Four dorsocentral bristles; fore coxa and all femora black; hypopygium asymmetrical; surstylus lacking conspicuous hook- shaped bristle ( Australia)............................................................. C. simplex Parent, 1941

20 Fore tibia with apical pectinate comb ( New Caledonia)................................... C. flavipes Evenhuis, 2005

- Fore tibia lacking apical pectinate comb ( Papua New Guinea)............... C motuporensis Grootaert & Meuffels, 1993

Figures

FIGURE 4. Cymatopus femoralis sp. nov., legs of male, SEM. (A) Fore leg in anterior view; (B) Fore femur and tibia in anterior view; (C) Fore tibia in anterior view, showing diagnostic leaf-like bristle; (D) Tip of fore tibia in anterior view; (E) Fore tarsomeres 2 – 5; (F) Fore tarsomere 4; (G) Hind leg in posterior view; (H) Hind femur and tibia in posterior view. Scale bars: 50 – 500 μm.

FIGURE 5. Cymatopus femoralis sp. nov., male genitalia. (A) Hypopygium in lateral view; (B) Cercus in lateral view; (C) Surstylus in lateral view; (D) Hypandrium in ventral view.

FIGURE 6. Cymatopus ventralis sp. nov., legs of male, SEM. (A, B) Fore leg in anterior view; (C) Hind leg in anterior view; (D) Hind leg in posterior view. Scale bars: 100, 200 μm.