Robustagramma, Marshall & Cui, 2005

Marshall, Stephen A. & Cui, Yongsheng, 2005, Systematics of Robustagramma, a new genus of New World Sphaeroceridae (Diptera), Zootaxa 1026 (1), pp. 1-122 : 12-18

publication ID

https://doi.org/ 10.11646/zootaxa.1026.1.1

publication LSID

lsid:zoobank.org:pub:3EDC6787-C73B-4969-BA06-022D0532364F

persistent identifier

https://treatment.plazi.org/id/0392570D-FFAC-426A-FEDA-ACBF8661FABD

treatment provided by

Felipe

scientific name

Robustagramma
status

 

Key to the species of Robustagramma View in CoL View at ENA

1. Prosternum bare. Greatest palpal width less (usually much less) than 1/3 palpus length ....................................................................................................................................... 7

­­ Prosternum setulose. Greatest palpal width 1/3 palpus length ( R. crassipalpus View in CoL group)2

2. Mid tibia with an anterodorsal bristle on middle third ................................................. 3

­­ Mid tibia without anterodorsal bristle middle third .................................................... 4

3. Mid tibia with an additional small bristle besides normal dorsal bristle on proximal third. In lateral view, cercus of male with a blunt apex ( Fig 108 View FIGURES 107–113 ) ( Mexico, Belize, Costa Rica) ............................................... R. latistylum Cui and Marshall View in CoL , new species

­­ Mid tibia with only a dorsal bristle on proximal third. In lateral view, cercus of male with a pointed apex ( Fig. 122 View FIGURES 121–127 ) ( Ecuador) ...................................................................... ............................................................. R. nigrivittatum Cui and Marshall View in CoL , new species

4. Both preapical palpal bristles distinctly shorter than greatest width of palpus. Cercus of male about half as long as surstylus ( Fig. 115 View FIGURES 114–120 ) ( Ecuador, Costa Rica, Panama) ....... ............................................................... R. longistylum Cui and Marshall View in CoL , new species

­­ One of two preapical palpal bristles similar in length to, or longer than, greatest width of palpus. Cercus of male distinctly longer than half of length of surstylus ............... 5

5. Prosternum with 3 or 4 pairs of setulae. Eye height about 3 times genal height ( Mexico, Belize, Costa Rica, Panama) … R. crassipalpus Cui and Marshall View in CoL , new species

­­ Prosternum with 2 pairs of setulae. Eye height about 2.5 times genal height............... 6

6. Cercus of male similar in length to surstylus ( Fig. 85 View FIGURES 85–91 ). Posteromedial prominence of sternite 5 of male with a wide medial emargination ( Venezuela) .................................. ................................................................ R. bolivarense Cui and Marshall View in CoL , new species

­­ Cercus of male distinctly shorter than surstylus ( Fig. 92 View FIGURES 92–98 ). Posteromedial prominence of sternite 5 of male with a small middle emargination ( Brazil) ................................... .................................................................. R. brasilense Cui and Marshall View in CoL , new species

7. Interfrontal bristles usually in more than two pairs (in addition to the pair of interfrontal setulae just above ptilinal suture). Arista slightly longer than head height .......... 15

­­ Interfrontal bristles in one or two pairs (in addition to the pair of interfrontal setulae above ptilinal suture). Arista distinctly shorter than head height ( R. brevicilium View in CoL group) ...................................................................................................................................... 8

8. Interfrontal bristles in 2 pairs (in addition to the pair of interfrontal setulae above ptilinal suture). Sternite 3 of male with a transverse row of long, strong bristles ( Fig. 37 View FIGURES 33–37 ) ( Costa Rica, Panama) ............................. R. setilamella Cui and Marshall View in CoL , new species

­­ Interfrontal bristles in a single strong pair. Sternite 3 of male without a transverse row of long, strong bristles ...................................................................................................... 9

9. Head with only one pair of orbital bristles ................................................................. 10

­­ Head with two pairs of orbital bristles ........................................................................ 11

10. Sternite 5 of male with a broadly emarginate posteromedial margin and 4 pairs of short, stout bristles ( Fig. 32 View FIGURES 29–32 ). ( Ecuador) ........................................................................ ................................................................ R. parauniseta Cui and Marshall View in CoL , new species

­­ Sternite 5 of male with a convex posteromedial margin and 3 pairs of short stout bristles ( Fig. 41 View FIGURES 38–41 ). ( Ecuador) ............................... R. uniseta Cui and Marshall View in CoL , new species

11 Wing with a stump vein on second sector of R 2+3 ( Fig. 364 View FIGURES 363–370 ) ..................................... 12

­­ Wing without a stump vein on second sector of R .................................................. 13

2+3

12. Sternite 5 of male with 6 pairs of long appressed bristles ( Fig. 28 View FIGURES 25–28 ) ( Venezuela)............ ........................................................... R. paralongiseta Cui and Marshall View in CoL , new species

­­ Sternite 5 of male with a row of 9 short, strong bristles ( Fig. 16 View FIGURES 13–17 ) ( Venezuela) .............. ................................................................. R. lingulatum Cui and Marshall View in CoL , new species

13. Sternite 5 of male with 6 pairs of appressed, long bristles ........................................ 14

­­ Sternite 5 of male without appressed, long bristles, but with two patches of short, strong bristles ( Fig. 5 View FIGURES 2–8 ) ( Costa Rica) ............ R. atratum Cui and Marshall View in CoL , new species

14. Sternite 5 of male with a black, shiny, globose posteromedial prominence; without short, stout bristles ( Fig. 21 View FIGURES 18–24 ) ( Costa Rica) ..................................................................... .................................................................... R. longiseta Cui and Marshall View in CoL , new species

­­ Sternite 5 of male without a posteromedial prominence, but with 5 pairs of short, stout bristles behind long bristles ( Fig. 12 View FIGURES 9–12 ) ( Panama) ............................................................ ................................................................. R. brevicilium Cui and Marshall View in CoL , new species

15. Distal portion of R 2+3 conspicuously curved forward. Postocellar bristles distinct ( R. flavistylum View in CoL group) ....................................................................................................... 16

­­ Distal portion of R 2+3 almost straight or slightly curved forward. Postocellar bristles absent or indistinct ..................................................................................................... 21

16. Dorsocentral bristles in 3 pairs (anterior pair distinctly longer than nearby acrostichal setulae but shorter than prescutellar acrostichal bristles). Cercus distinctly longer than halflengthofsurstylus.Whip­likescleritesofdistiphalluswithoutdistinct,node­likestructures 17

­­ Dorsocentral bristles in 2 pairs. Cercus broad, shorter than half surstylus length ( Fig. 302 View FIGURES 302–308 ). Whip­like sclerites of distiphallus with node­like structures ( Fig. 304 View FIGURES 302–308 ). ( Ecuador, Venezuela) ....................................... R. brevicauda Cui and Marshall View in CoL , new species

17.Cercus similar in length to surstylus.Surstylus,in lateral view,broad and nearly rectangular 18

­­ Cercus much shorter than surstylus. Surstylus, in lateral view, not rectangular ........ 19

18. Surstylus yellow or reddish yellow, with long, dense setae ( Figs. 317, 318 View FIGURES 317–323 ) ( Mexico, Costa Rica, Panama) .............................. R. flavistylum Cui and Marshall View in CoL , new species

­­ Surstylus usually pale yellow, with relatively short setae ( Fig. 325 View FIGURES 324–330 ) ( Mexico) ............. .............................................................. R. pallidistylum Cui and Marshall View in CoL , new species

19. Wing lightly, evenly pigmented, without clear bands or marks ................................. 20

­­ Wing pigmented, with hyaline bands distal to the apex of R ( Brazil, Argentina) ..... ................................................................ R. cultriforme Cui and Marshall View in CoL , new species

2+3

20. Acrostichal setulae in 8 rows between anterior postsutural dorsocentral bristles. Surstylus in lateral view with posterior portion longer than anterior portion ( Venezuela) .... ............................................................ R. angusticauda Cui and Marshall View in CoL , new species

­­ Acrostichal setulae in 6 rows between anterior postsutural dorsocentral bristles. Surstylus in lateral view with anterior portion longer than anterior portion ( Brazil) ............. ............................................................ R. setituberosum Cui and Marshall View in CoL , new species

21. Facial ridge between antennae very narrow, much narrower than width of scape. Frontal vitta between interfrontal plates usually gradually but distinctly convex from middle to front. Relatively small species, less than 1.9mm, often less than 1.5mm ( R. altifrons View in CoL group) .......................................................................................................... 22

­­ Facial ridge between antennae subequal to, or broader than, width of scape. Frontal vitta between interfrontal plates flat or nearly so. Size variable ................................ 27

22. Frons with anterior half yellow or reddish yellow. Arista slightly longer than head height Surstylus variable, but not divided into two subequal lobes............................ 23

­­ Frons with anterior half mostly dark brown. Arista slightly shorter than head height. Surstylus divided into 2 subequal broad lobes (Figs. 164,165) ( Mexico, Honduras) .... .............................................................. R. obscurifrons Cui and Marshall View in CoL , new species

23. Palpus with preapical bristles very small, shorter than greatest width of palpus. (Southwestern United States) ............................. R. minutiseta Cui and Marshall View in CoL , new species

­­ Palpus with preapical bristles distinctly longer than greatest width of palpus ........... 24

24. In lateral view,surstylus with ventral apex rounded,blunt( Fig.144 View FIGURES 143–149 )(Eastern United States) R. hebes Cui and Marshall View in CoL , new species

­­ In lateral view, surstylus with ventral apex more or less pointed ............................... 25

25. In posterior view, surstylus with ventral apex conspicuously curved inward ( Fig. 150 View FIGURES 150–156 ). (Eastern Canada, United States) … R. incurvum Cui and Marshall View in CoL , new species

­­ In posterior view, surstylus at most indistinctly curved inward distally .................... 26

26. In lateral view, surstylus almost triangular ( Fig. 137 View FIGURES 136–142 ). (Southwestern United States) … ................................................................. R. arizonense Cui and Marshall View in CoL , new species

­­ In lateral view, surstylus anteriorly bifurcate ( Fig. 130 View FIGURES 128–135 ) ( United States) ....................... ..................................................................... R. altifrons Cui and Marshall View in CoL , new species

27. Palpus conspicuously thickened, greatest palpal width about 1/3 length of palpus ... 28

­­ Greatest palpal width distinctly less than one third of length of palpus .................... 29

28. Mid tibia with a dorsal proximal bristle. Sternite 5 of male over 3 times as long as sternite 4 ( Fig. 70 View FIGURES 67­73 ). ( R. binitidum View in CoL group; Peru, Venezuela) ........................................... ............................................................ R. macrosternum Cui and Marshall View in CoL , new species

­­ Mid tibia with a posterodorsal proximal bristle. Sternite 5 of male less than twice as long as sternite 4 ( Peru) … R. orthogonium Cui and Marshall View in CoL , new species

29. Dorsocentral bristles in 3 pairs. Posterodorsal katepisternal bristle distinctly longer than 2/3 of distance between bristle base and wing base .......................................... 30

­­ Dorsocentral bristles in 2 pairs. Posterodorsal katepisternal bristle usually not longer than 2/3 of distance between bristle base and wing base ........................................... 32

30. Mid tibia with 7 dorsal bristles, including an additional anterodorsal proximal bristle and a small, additional anterodorsal bristle near middle ( R. triangulatum View in CoL group, Dominican Republic) ................................ R. multiseta Cui and Marshall View in CoL , new species

­­ Mid tibia with the usual 5 dorsal bristles ................................................................... 31

31. Mid tibia of male with a row of short, stout ventral bristles on distal 3/4. Cercus of male triangular in posterior view ( Fig. 287 View FIGURES 287–293 ) ( R. triangulatum View in CoL group. ( Cuba) ............... .............................................................. R. triangulatum Cui and Marshall View in CoL , new species

­­ Only distal 1/3 of mid tibia of male with stout ventral bristles. Cerci divergent, not triangular ( Fig. 342 View FIGURES 342–348 ) ( Mexico, Honduras, Costa Rica, Guatemala, Panama) .................... ................................................................. R. disjunctum Cui and Marshall View in CoL , new species

32. Anterodorsal katepisternal bristle absent; frons slightly shiny and flattened; vein R 2+3 short, ca. 1.2 times as long as first sector of vein R 4+5 ( Brazil) … R. acutistylum Cui and Marshall View in CoL , new species

­­ Anterodorsal katepisternal bristle present; frons pruinose; vein R 2+3 over 1.5 times as long as first sector of vein R 4+5 .................................................................................. 33

33. Male wing with first costal sector (between humeral and subcostal breaks) thicker than second costal sector in dorsal view. Sternite 5 of male usually over twice as long as sternite 4 ( R. robustinervus View in CoL group) ............................................................................. 34

­­ Male wing with first costal sector thinner than second costal sector in dorsal view. Sternite 5 of male usually 1.5 times as long as sternite 4 ........................................... 36

34. Mid femur of male with ventral bristles only on basal third. First costal sector of male conspicuously thicker than second costal sector in superior view.............................. 35

­­ Mid femur of male with ventral bristles on basal ¾. First costal sector of male slightly thicker than second sector in superior view ( Brazil) ...................................................... ................................................................... R. dilatatum Cui and Marshall View in CoL , new species

35. Preapical palpal bristles of male shorter than greatest width of palpus. Wing nearly clear. Sternite 5 2.5 times as long as wide, posteromedial lobes each densely covered with setulae but without long bristles ( Fig. 52 View FIGURES 49–55 ) ( Venezuela, Guyana) ........................... ............................................................ R. robustinervus Cui and Marshall View in CoL , new species

­­ Preapical palpal bristles of male slightly longer than greatest width of palpus. Wing uniformly lightly pigmented. Sternite 5 twice as long as wide, posteromedial lobes each with a few long bristles ( Fig. 59 View FIGURES 56–59 ) ( Ecuador) .......................................................... ...................................................................... R. setosum Cui and Marshall View in CoL , new species

36. Sternite 5 of male with a characteristic pair of large, dark posterolateral lobes and a pale central area ( Fig 352 View FIGURES 349–355 ). Surstylus with a long, tapering anterior lobe ( Fig. 350 View FIGURES 349–355 ). ( Mexico, Belize, Costa Rica, Panama, Ecuador, Venezuela, Guyana, Peru) .................. ..................................................................... R. mirabile Cui and Marshall View in CoL , new species

­­ Sternite 5 without posteromedial lobes or with lobes much smaller than Fig. 350 View FIGURES 349–355 ; anterior part of surstylus not elongate and tapered as in Fig. 352 View FIGURES 349–355 ................................... 37

37. Greatest width of palpus about 1/4 as long as palpus. Male with preapical palpal bristles similar in length to greatest width of palpus; female with preapical palpal bristles slightly longer than greatest width of palpus. Sternite 5 of male with a distinct borderline between anterior dark and posteromedial pale area( Fig.63 View FIGURES 60–66 )( R. binitidum View in CoL group, part) 38

­­ Greatest width of palpus usually less than 1/5 of length of palpus. Preapical palpal bristles at least 1.5 times as long as greatest width of palpus. Sternite 5 of male rarely with borderline between anterior and posterior area ( R. robustum View in CoL group) ............... 40

38. Sternite 5 of male with a pair of shiny posteromedial patches ( Fig. 63 View FIGURES 60–66 ). Cercus of male with distal half very narrow ( Venezuela, Guyana, Ecuador, Peru) ................................ ................................................................... R. binitidum Cui and Marshall View in CoL , new species

­­ Sternite 5 of male without a pair of shiny patches. Cercus of male with distal half broad 39

39. Surstylus with an almost bare anterior lobe ( Fig. 75 View FIGURES 74–80 ). In posterior view, apex of male cercus blunt ( Belize, Costa Rica, Guatemala, Panama, Venezuela, Columbia, Guyana, Ecuador, Peru) ...................................... R. obscuratum Cui and Marshall View in CoL , new species

­­ Surstylus almost entirely setose ( Fig. 82 View FIGURES 81–84 ). In posterior view, apex of cercus of male pointed ( Venezuela) … R. rarum Cui and Marshall View in CoL , new species

40. Eye conspicuously small, eye height about 1.2–1.3 times genal height. General body color usually reddish yellow ( Mexico) ..... R. oculiculus Cui and Marshall View in CoL , new species

­­ Eye large, eye height usually more than 2 times genal height. General body color usually dark brown .......................................................................................................... 41

41. Sternite 5 of male with 3 or 4 pairs of strong spine­like bristles, twice as long as distancebetweenbristlebaseandposteriormarginofsternite5( Fig.267 View FIGURES 264–270 )( Venezuela, Colombia) R. spinatimargo Cui and Marshall View in CoL , new species

­­ Sternite 5 of male without strong bristles, or with strong bristles not surpassing posterior margin of sternite 5 ............................................................................................. 42

42. Wing lightly pigmented, with transverse clear bands beyond intersection of costa and R 2+3. Surstylus usually whitish in color, shorter than cercus, and with strong bristles ( Fig. 273 View FIGURES 271–278 ) ( Canada, United States, Mexico). R. vulgare Cui and Marshall View in CoL , new species

­­ Wing clear, or very lightly pigmented and without distinct transverse clear bands. Surstylus usually yellow to reddish yellow, usually with relatively short bristles ........... 43

43. In lateral view, surstylus with a tapering apex, and distal half similar in width to basal half ( Fig. 179 View FIGURES 178–184 ) ( Mexico) .................... R. angustistylum Cui and Marshall View in CoL , new species

­­ In lateral view, surstylus with a truncate apex; distal half wider than basal half ........ 44

44. Ejaculatory apodeme extraordinarily large, over 2/3 as long as aedeagal apodeme ( Fig. 202 View FIGURES 200–206 ). In lateral view, cercus perfectly straight ( Fig. 201 View FIGURES 200–206 ) ( Mexico, Belize, Guatemala, Costa Rica, Panama, Colombia, Venezuela, Guyana, Ecuador, Peru) ........................... ....................................................... R. gigantisclerosum Cui and Marshall View in CoL , new species

­­ Ejaculatory apodeme shorter, usually shorter than half of length of aedeagal apodeme. In lateral view, cercus more or less curved backward ................................................ 45

45. Sternite 5 of male with at least one pair of short, strong bristles on posterior half .... 48

­­ Sternite 5 of male without short, strong bristles on posterior half ............................. 46

46. Mid femur of male with a regular row of stout anteroventral bristles. Male cercus with distal quarter slightly inflated (Figs. 221,222) ( St. Lucia) ............................................. ..................................................................... R. luciense Cui and Marshall View in CoL , new species

­­ Mid femur of male with only scattered small bristles.Cercus with distal quarter not inflated 47

47. Sternite 5 of male with many small lanceolate bristles on anteromedial area ( Fig. 217 View FIGURES 214–220 ). ( St. Kitts) .................................................... R. kittsense Cui and Marshall View in CoL , new species

­­ Sternite 5 of male without lanceolate bristles ( Fig. 246 View FIGURES 242–249 ). ( Paraguay, Argentina) ........... ........................................................................................................ R. ovipennis (Duda)

48. In lateral view, cercus of male sinuate at middle ( Fig. 258 View FIGURES 257–263 ). Small species (1.0­ 1.4 mm) ( Venezuela, Guyana) ........................ R. sinuosum Cui and Marshall View in CoL , new species

­­ In lateral view, cercus of male weakly curved backward ........................................... 49

49. Cercus distinctly longer than surstylus. In lateral view, distal third of cercus slightly inflated. Surstylus with anteroventral and posteroventral portions rounded ( Fig. 251 View FIGURES 250–256 ) ( Costa Rica, Panama) .................................................................... R. robustum (Spuler) View in CoL

­­ Either cercus shorter than surstylus or distal third of cercus narrow (not inflated) in lateral view ...................................................................................................................... 50

50. Sternite 5 of male with only one or two pairs of short, stout bristles on posterior half .. ..................................................................................................................................... 51

­­ Sternite 5 of male with 3 or more pairs of short, stout bristles on posterior half ....... 52

51. Cercus of male much longer than surstylus; in posterior view, inner margins of cerci nearly parallel ( Fig. 207 View FIGURES 207­213 ) ( Grenada) ..... R. grenadense Cui and Marshall , new species

­­ Cercus of male similar in length to surstylus; in posterior view, gap between inner margins of cerci rhomboid in shape ( Venezuela, Guyana) ............................................. ..................................................................... R. aequale Cui and Marshall View in CoL , new species

52. In lateral view surstylus with posteroventral margin rounded ( Fig. 193 View FIGURES 192–199 ). Ejaculatory apodeme much less than 1/3 length of aedeagal apodeme ( Venezuela, Guyana) .......... ............................................................. R. crassisaccus Cui and Marshall View in CoL , new species

­­ In lateral view surstylus with posteroventral margin angular ( Fig. 186 View FIGURES 185–191 ). Ejaculatory apodeme distinctly longer than one third of aedeagal apodeme ................................. 53

53. In lateral view, anteroventral margin of surstylus angular ( Fig. 186 View FIGURES 185–191 ). Mid tibia of male with a row of short, stout ventral bristles on distal half ( Mexico, Belize, Guatemala, Honduras, Costa Rica, Panama).......... R. biangulatum Cui and Marshall View in CoL , new species

­­ In lateral view, anteroventral margin of surstylus rounded ( Fig. 228 View FIGURES 228–234 ). Mid tibia of male with short, stout ventral bristles on distal third ( Belize) ................................................ .................................................................... R. mayense Cui and Marshall View in CoL , new species

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Sphaeroceridae

Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF