Tabanus trivittatus, Fabricius, 1805

Carmo, Daniel D. D. & Henriques, Augusto L., 2019, Taxonomy of Tabanus trivittatus species-group (Diptera: Tabanidae), with description of five new species, Zootaxa 4554 (1), pp. 63-100: 64-65

publication ID

https://doi.org/10.11646/zootaxa.4554.1.2

publication LSID

lsid:zoobank.org:pub:986112BE-6ABB-47FE-BA8F-CECEF1C21A5D

persistent identifier

http://treatment.plazi.org/id/746A87ED-7309-FF91-FF17-D54822C8113B

treatment provided by

Plazi

scientific name

Tabanus trivittatus
status

 

Key for females of Tabanus trivittatus  species-group. Adapted from Fairchild (1976)

1 Subcallus largely pruinescent, bare areas reduced to patches above each antennal base, separated by a median pruinescent stripe ( Fig. 10CView FIGURE 10). Abdomen acutely pointed. All coxae, fore femur and at least bases of remaining femora black. Antennal style contrastingly black, postpedicel yellow, but slightly longer than style, its dorsal angle rounded. Abdomen pale haired beneath, unbanded, the dorsal mid stripe of a series connected slender triangles, dorsolateral stripes broader. Pacific coast of Panama ( Fig. 33View FIGURE 33)...................................................................................... T. enanus 

- Subcallus extensively bare, without pruinescent mid stripe ( Figs. 1CView FIGURE 1, 5CView FIGURE 5, 7CView FIGURE 7, 9CView FIGURE 9, 11CView FIGURE 11). Abdomen not regularly pointed.... 2

2 Abdomen with conspicuous color contrast, first two or three tergites brownish yellow with yellow hairs, the remainder dark brown with black hairs ( Fig. 3AView FIGURE 3). Fore femur brown, mid and hind femora with brownish yellow integument, frequently infuscated at the base, never whole black. Subcallus relatively flattened ( Fig. 3DView FIGURE 3). Abdomen unbanded ventrally. Frons clearly divergent. South Panama to Northwestern Colombia ( Fig. 33View FIGURE 33)........................................... T. aniptus 

- Abdomen without contrast, if present, not evident. A different combination of characters............................. 3

3 Frons broad, height four times the basal width ( Fig. 21CView FIGURE 21). Scutum with sides, including notopleuron, posterior portion, scutellum and a pair of dorsolateral integumental stripes, pale ( Figure 21AView FIGURE 21). Legs yellow except tip of fore tibia. Antenna wholly yellow orange. Abdomen wholly pale-haired beneath, the dorsal mid stripe narrow and continuous, the dorsolateral stripes a series of separate oval patches ( Fig. 21AView FIGURE 21). Paraguay, Brazil (Mato Grosso do Sul) ( Fig. 36View FIGURE 36)................... T. schadei 

- Frons narrow at least six times as high as basal width. Scutum uniformly colored, no more than notopleuron and scutellum paler................................................................................................ 4

4 Abdomen black or dark brown with a single prominent continuous pale median stripe from first to sixth tergite ( Fig. 5AView FIGURE 5 and 27AView FIGURE 27), very rarely with faint indications of dorsolateral pale stripes on tergite 1 or tergites 1 and 2. Wings distinctly brownish especially along fore border and apex. All coxae and femora mostly black. Abdomen distinctly banded ventrally.......... 5

- Abdomen with evident dorsolateral stripes at least to tergite 3 ( Figs. 7AView FIGURE 7, 10AView FIGURE 10, 11AView FIGURE 11, 12AView FIGURE 12)............................ 7

5 Smaller species, generally less than 10 mm long. Antenna with style darker, generally black and contrasting, or postpedicel partly or wholly dusky ( Fig. 27DView FIGURE 27). Wings less dark. Guatemala to western Colombia, Ecuador and Peru ( Fig. 34View FIGURE 34).................................................................................................... T. unistriatus 

- Larger species, generally over 10 mm in length. Antenna wholly reddish orange. Wing intensely smoky, cell r1 and r2+3 almost black.......................................................................................... 6

6 All femora black. Brazil (Acre and Amazonas). Eastern Peru and Ecuador ( Fig. 34View FIGURE 34).................... T. argentivittatus 

- All femora yellow, at most with the hind femur dusky. Peru (Huánuco) ( Fig. 34View FIGURE 34)............. T. argentivittatus huallagensis 

7 Notopleuron dark, concolorous with scutum (better visualized with integument moistening or scraping)................. 8

- Notopleuron paler than adjacent scutum (better visualized with integument moistening or scraping)................... 12

8 Postpedicel long, nearly or longer than twice the length of antennal style ( Fig. 25DView FIGURE 25). Dorsal tooth close to postpedicel base. 9

- Postpedicel shorter, sometimes nearly as long as wide. Style length obviously longer than half postpedicel length ( Figs. 7DView FIGURE 7, 14DView FIGURE 14, 16DView FIGURE 16).......................................................................................... 10

9 All coxae and femora black ( Fig. 25CView FIGURE 25). Colombia. Venezuela. Guyana. Surinam, French Guiana. Brazil (Amazon region). Peru. Bolivia ( Fig. 34View FIGURE 34)......................................................................... T. trivittatus 

- All coxae, mid and hind femora yellow ( Fig. 12CView FIGURE 12). Northern Brazil (Pará, Maranhão) ( Fig. 34View FIGURE 34)......... T. mackerrasi  sp.n.

10 All coxae and femora black or dark brown. Wings light gray ( Fig. 7BView FIGURE 7). Eastern Colombia and Peru. Southern Venezuela. Guyana. Brazil (Amazon basin) ( Fig. 31View FIGURE 31).............................................................. T. callosus 

- Mid and hind femora brownish yellow or dusky only at the base, never all black. Coxae variable. Wings weakly to strongly infuscated.......................................................................................... 11

11 Femora yellow ( Figure 16BView FIGURE 16). Callus black, clearly inflated in lateral view ( Fig. 16DView FIGURE 16). Wings strongly infuscated. Eastern Peru, Brazil (Acre) ( Fig. 31View FIGURE 31)....................................................................... T. picicallosus 

- Fore femur black, mid and hind femora blackish at the base, yellow at apex ( Fig. 14BView FIGURE 14). Callus light brown, slightly inflated in lateral view ( Fig. 14DView FIGURE 14). Wings only weakly infuscated at radial cells. Eastern Peru and Bolivia, Brazil (Acre) ( Fig. 34View FIGURE 34)........................................................................................... T. noncallosus  sp.n.

12(7) Postpedicel long and slender ( Fig. 13DView FIGURE 13), similar to T. trivittatus  , nearly or longer than twice the length of the antennal style. Dorsal tooth close to postpedicel base. Northern Brazil (Pará, Maranhão) ( Fig. 36View FIGURE 36)................... T. macrocerus  sp. n.

- Postpedicel short and stout ( Figs. 9DView FIGURE 9, 11DView FIGURE 11 and 18DView FIGURE 18). Style nearly the same length as postpedicel, sometimes longer. Dorsal tooth dislocated toward middle of postpedicel.............................................................. 13

13 All coxae integument mainly yellow. Fore femur yellow to brownish yellow, remaining femora wholly pale ( Fig. 11BView FIGURE 11)... 14

- At least fore coxa darker than the remainder. Fore femur brown to black, remaining femora at least blackish at the base or darker than tibiae..................................................................................... 18

14 Fore tibia obscurely bicolored, basal half to 2/3 yellow with pale hairs, remaining1/3 yellow to brownish yellow with black hairs. Fore femur mainly pale haired..................................................................... 15

- Fore tibia clearly bicolored, basal half to 2/3 yellow or white, the remaining 1/3 black and black haired ( Fig. 18BView FIGURE 18). Fore femur mainly black haired................................................................................... 16

15 Frons twice as wide at vertex than at the base ( Fig. 11AView FIGURE 11). Postpedicel nearly as long as wide ( Fig. 11DView FIGURE 11). Dorsolateral stripes even to tergite 3, interrupted from 4 to 6. Peru and Bolivia (East of Andes) ( Fig. 31View FIGURE 31)............................. T. isis 

- Frons less convergent ( Fig. 24AView FIGURE 24). Postpedicel longer than wide ( Fig. 24DView FIGURE 24). Dorsolateral stripes continuous to tergite 5, sometimes 6. Coast of Suriname, French Guiana and Brazil (Pará) ( Fig. 35View FIGURE 35).................................. T. tristichus 

16 Integument of scutum red to reddish brown. Fore femur mainly pale haired, black haired only on anterior region. Middorsal stripe a slender series of connected triangles. Dorsolateral a series of disconnected patches from tergite 1-6 ( Fig. 9AView FIGURE 9). (Mato Grosso, Rondônia, Mato Grosso do Sul, Tocantins and Federal District) ( Fig. 35View FIGURE 35)..................... T. dorsorufus  sp.n.

- Integument of scutum darker. Fore femur mainly black haired. Middorsal abdominal stripe broad and more even. Dorsolateral abdominal stripes variable ( Figs. 1AView FIGURE 1, 18AView FIGURE 18)................................................................ 17

17 Dorsolateral abdominal stripes a series of disconnected patches. Frons narrower (F.I. 8.4) ( Fig. 1AView FIGURE 1). Northwestern Brazil (Acre, Rondônia) ( Fig. 32View FIGURE 32).............................................................. T. albocapillus  sp. n.

- All Abdominal stripes even, yellow ( Fig. 18AView FIGURE 18). Frons broader (F.I. 6.4). Eastern Colombia, Peru and Bolivia, Brazil and northern Argentina ( Fig. 35View FIGURE 35)..................................................................... T. restrepoensis 

18(13) Postpedicel nearly as long as wide ( Fig. 19DView FIGURE 19). Pruinescence at dorsal area of subcallus ( Fig. 19CView FIGURE 19) more extensive than other species except, T. enanus  . Dorsolateral stripes extending into tergite 5 ( Fig. 19AView FIGURE 19). Mexico (Nayarit, Jalisco, Morelos) ( Fig. 33View FIGURE 33).......................................................................................... T. rhizonshine 

- Postpedicel clearly longer than wide ( Figs. 15DView FIGURE 15, 17DView FIGURE 17 and 22DView FIGURE 22). Pruinescence of dorsal area on subcallus not so extensive ( Fig. 15CView FIGURE 15). Dorsolateral abdominal stripes variable.............................................................. 19

19 Frons broad (Frontal index less than 6.0), strongly divergent above, more than twice as wide at vertex than at base ( Fig. 15CView FIGURE 15). Abdominal stripes even ( Fig. 15AView FIGURE 15). Argentina (Salta, Catamarca, Misiones). Brazilian Cerrado (Tocantins, Mato Grosso, Goiás, São Paulo) and Paraguay (Villarica, Cerro Pelado) ( Fig. 32View FIGURE 32)...................................... T. palpalis 

- Frons narrower and less divergent. Middorsal abdominal stripe a series of connected triangles. Dorsolateral disconnected.. 20

20 Dorsolateral stripes reaching tergite 5, sometimes 6 ( Fig. 22AView FIGURE 22). Wings always glass clear. Amazon basin ( Fig. 32View FIGURE 32).................................................................................................. T. sextriangulus 

- Dorsolateral stripes reaching tergite 4 ( Fig. 17AView FIGURE 17). Wings glass clear or lightly infuscated. Panama to western Ecuador ( Fig. 33View FIGURE 33)........................................................................................... T. platycerus 

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Tabanidae

Genus

Tabanus