Asiobaccha Violovitsh

Mengual, Ximo, 2016, A taxonomic revision of the genus Asiobaccha Violovitsh (Diptera: Syrphidae), Journal of Natural History 50, pp. 2585-2645 : 2638-2641

publication ID

https://doi.org/ 10.1080/00222933.2016.1206634

publication LSID

lsid:zoobank.org:pub:6B627B0F-9440-47F1-90F4-9AF4C7308A99

DOI

https://doi.org/10.5281/zenodo.4333773

persistent identifier

https://treatment.plazi.org/id/B23987DC-FFB3-FFF9-5FE0-D1A9FB26FA80

treatment provided by

Carolina

scientific name

Asiobaccha Violovitsh
status

 

Key to the species of Asiobaccha Violovitsh View in CoL View at ENA

1. Alula broad or reduced but always present ( Figures 1 View Figure 1 , 3a View Figure 3 , 8a View Figure 8 ) .................................... 4

– Alula absent, anal lobe reduced ( Figure 9d View Figure 9 ).......................................................................... 2

2. Cell C almost completely bare, microtrichose on apical 1/5. Face with white pollinosity ( Figure 10f View Figure 10 ). Abdomen dark; tergum 1 dark ( Figure 10a, b View Figure 10 ) (New Guinea) ................................................................................................................... A. selsi Mengual View in CoL sp. nov.

– Cell C entirely microtrichose. Face with yellow pollinosity ( Figure 9f View Figure 9 ). Abdomen black with yellow markings on terga 2 and 3, sometimes also on tergum 4 ( Figures 6c View Figure 6 , 9c, d View Figure 9 ); tergum 1 usually yellow, not always.................................................................... 3

3. Pleuron dark: meron, metaepisternum and metacoxa dark brown ( Figure 9d View Figure 9 ). Metatibia yellow-brown ( Figure 9c, d View Figure 9 ). Scutellum unicolor, between yellow-brown to black ( Taiwan, Vietnam, Sulawesi and Luzon).............. .............. A. sauteri (Kertész) View in CoL

– Pleuron lighter: meron, metaepisternum and metacoxa yellow ( Figure 6d View Figure 6 ). Metatibia yellow with medial broad, black annulus ( Figure 6c, d View Figure 6 ). Scutellum yellow with medial dark area (Sumatra and Malay Peninsula).......................................................... ............................................................................ A. maculosa Mengual & Thompson View in CoL sp. nov.

– [Note: A. maculosa View in CoL has a narrow, linear alula but it is absent in all the paratypes; A. sauteri View in CoL has no alula. This species is keyed out in couplets 3 and 8]

4. Scutellum yellowish ( Figures 5c View Figure 5 , 10c View Figure 10 ). Abdomen usually with yellow or orange markings ( Figures 5c View Figure 5 , 7a View Figure 7 , 10c View Figure 10 ). Face bright yellow ( Figures 5e View Figure 5 , 8e View Figure 8 ) ............................ 7

– Scutellum and abdomen entirely black ( Figures 3c View Figure 3 , 8c View Figure 8 ). Face variable: black to dark yellow ( Figures 3f View Figure 3 , 8f View Figure 8 )....................................................................................................................... 5

5. Metatarsi yellowish white, except metabasitarsomere dark on basal 1/5 ( Figure 3c, d View Figure 3 ). Alula mostly bare, microtrichose only on anterodistal quarter, narrower than cell BM ( Solomon Islands)..................................... ..................................... A. albipeza Mengual View in CoL sp. nov.

– Metatarsi dark, black or dark brown ( Figures 8d View Figure 8 , 9b View Figure 9 ). Alula microtrichose on apical half or more, as broad as or broader than cell BM ............................................................ 6

6. Cell BM bare on basal half or more, cells R and CuP bare basally, costal cell bare on basal half or less ( Vanuatu, New Caledonia, Fiji, Tonga)................ A. praefica (Bezzi)

– Wing entirely microtrichose except alula bare very basally ( Samoa)............................... ................................................................................................... A. samoaensis Mengual View in CoL sp. nov.

7. Scutellum variable, usually entirely yellow or dark brown, never with a medial, round black macula. Tergum 4 different................................................................................. 9

– Scutellum yellow with a medial, isolated dark/black macula surrounded by yellow ( Figure 11a View Figure 11 ). Tergum 4 with two longitudinal yellow vitta reaching anterior margin ( Figure 11a View Figure 11 )........................................................................................................................................... 8

8. Alula broad, broader than costal cell. Tergum 3 with a submedial, triangular yellow fascia, not divided medially ( Figure 11a View Figure 11 ). Male: Frontal triangle densely yellow pollinose dorsally ( Figure 12f View Figure 12 ). Female: frons yellow pollinose on dorsal 3/4 (between anterior ocellus and antennal base), laterally joining pollinosity of face; and ocellar triangle shiny ( Figure 11e View Figure 11 ) (Borneo, Malay Peninsula, Sumatra, Java, Vietnam).................................................................................................. A. tinctiventris (Meijere)

– Alula narrow, as narrow as or narrower than costal cell ( Figure 6c View Figure 6 ). Tergum 3 with two broad yellow maculae, not medially joined ( Figure 6c View Figure 6 ). Male: Frontal triangle shiny, not pollinose ( Figure 6f View Figure 6 ). Female: frons yellow pollinose only on dorsal 1/2 or less (between anterior ocellus and antennal base), isolated from facial pollinosity; and ocellar triangle pollinose ( Figure 12e View Figure 12 ) (Sumatra and Malay Peninsula)................. ............................................................................ A. maculosa Mengual & Thompson View in CoL sp. nov.

9. Mesonotal fringe or collar absent on anterior part of scutum ( Figures 4d View Figure 4 , 10e View Figure 10 ). Alula narrower than costal cell, at most as broad as costal cell ( Figure 14c, d View Figure 14 ) ............. 17

– Mesonotal fringe or collar well-defined on anterior part of scutum ( Figures 3b View Figure 3 , 4b View Figure 4 ). Alula usually broader than costal cell in the apical part ( Figure 14a, b View Figure 14 ) ................ 10 [NOTE: A. tinctiventris has no mesonotal collar but alula broader than costal cell. This species is keyed out in couplets 7 and 8]

10. Wing entirely microtrichose, except alula bare on posterior margin ( Figure 3a, b View Figure 3 ) ( Solomon Islands).................................................... A. aea Mengual & Thompson View in CoL sp. nov. – Wing bare basomedially; cell BM bare basally ( Figures 4a View Figure 4 , 5c View Figure 5 )................................... 11

11. Abdominal tergum 1 black or brownish, sometimes yellowish on lateral margins ( Figure 4a View Figure 4 ); tergum 2 black with two pairs of yellow maculae: one basally, which may join medially, and another medially; tergum 3 with two triangular maculae or with a broad yellow fascia not reaching anterior margin ( Figures 4a View Figure 4 , 8a View Figure 8 )............. 14

– Abdominal tergum 1 yellow with or without narrow dark fascia on posterior margin ( Figure 12a View Figure 12 ); tergum 2 yellowish, brownish posteriorly, with a dorsomedial brownish macula; tergum 3 with broad yellow fasciate maculae reaching anterior margin ( Figures 5c, d View Figure 5 , 7c View Figure 7 )............................................................................................................. 12 [Note: A. virtuosa View in CoL does not totally comply with any options of the couplet 11, as it has tergum 1 yellow, but yellow macula on tergum 3 does not reach anterior margin. For this reason, it appears twice in the key]

12. Cell R entirely microtrichose posterior to spurious vein ( Figure 14b View Figure 14 ). Tergum 4 with two subtriangular/rectangular yellow maculae, isolated from anterior margin ( Figure 12a, b View Figure 12 )............................................... ............................................... A. virtuosa (Curran) View in CoL

– Cell R bare basally, posterior to spurious vein. Tergum 4 black, or with yellow markings reaching anterior margin ( Figures 5d View Figure 5 , 7c View Figure 7 ) ........................................................ 13

13. Abdominal tergum 4 black, sometimes with two diffuse round yellow maculae on anterior margin; tergum 5 black ( Figure 5c, d View Figure 5 ). Stigma brown, not contrasting with colouration of subcostal cell or cell R1 ( Figure 5d View Figure 5 ) (New Guinea).................................... ....................................................................................................... A. doesburgi Mengual sp. nov.

– Abdominal tergum 4 black with a broad yellow fascia on anterior 1/2, slightly emarginated medially on posterior margin; tergum 5 black with two basal elongate yellow maculae on anterior margin ( Figure 7c, d View Figure 7 ). Stigma darker, contrasting with subcostal cell and cell R1 ( Figure 7c View Figure 7 ) ( Australia)....................................................................... ..................................................................... A. notofasciata Thompson & Mengual View in CoL sp. nov.

14. Abdominal tergum 4 black with two subtriangular/rectangular yellow maculae, broadening laterally and not reaching the lateral margin, on basal half of the tergum ( Figure 12a View Figure 12 ); golden yellow pollinosity on posterior anepisternum, katepisternum and katatergum; cell R entirely microtrichose posterior to spurious vein ( Figure 14b View Figure 14 ) (Malay Peninsula, Sumatra and Borneo).................. A. virtuosa (Curran) View in CoL

– Abdominal tergum 4 black, at most with two round very small yellow maculae on the anterolateral margin of the tergum ( Figures 4a View Figure 4 , 8a View Figure 8 , 12c View Figure 12 ); white or golden pollinosity on posterior anepisternum, katepisternum and katatergum; cell R bare on basal 1/3 or more, posterior to spurious vein ( Figure 14a View Figure 14 ).................................... 15 [NOTE: Some specimens of A. nubilipennis View in CoL from Sumatra have the cell R almost entirely microtrichose, although they have tergum 4 black and key out to couplet 16]

15. Metatarsus entirely black; scutellum black, sometimes posterior margin tawny ( Figure 4a, b View Figure 4 ) ( Philippines)............................ A. aquila Thompson & Mengual View in CoL sp. nov.

– Metatarsus pale (white-yellow), except metabasitarsomere black on basal 2/3; scutellum yellow-brown ( Figures 5a View Figure 5 , 8b View Figure 8 ) .............................................................................. 16

16. Abdominal tergum 3 with two medial subtriangular yellow maculae, pointing anteriorly and not reaching lateral margins; metafemur mostly dark brown; pleuron with yellow golden pollinosity ( Figure 5a, b View Figure 5 ) (Sumba).......... A. bimaculata (Keiser) View in CoL

– Abdominal tergum 3 with medial broad yellow fascia (about 1/3 to 1/2 of tergum length) reaching lateral margins, sometimes also with two laterobasal small yellow maculae ( Figures 8a View Figure 8 , 12c View Figure 12 ); metafemur yellow with medial dark annulus ( Figure 8b View Figure 8 ); pleuron with white or yellow pollinosity (widely spread: from Sri Lanka, India to Japan, south to Indonesia).............................................................. A. nubilipennis (Austen) View in CoL

17. Scutum, scutellum, pleuron and legs yellowish orange; abdomen mostly yellowish orange basally ( Figure 10c View Figure 10 ). Male genitalia large, with epandrium and hypandrium enclosed under sternum 4 ( Figure 10d View Figure 10 ) ( Solomon Islands)................................................. ............................................................................................................ A. taronja Mengual View in CoL sp. nov.

– Scutum darker dorsally, scutellum yellowish ( Figure 11c View Figure 11 ), pleuron yellow with two black vittae (from dorsomedial anepimeron to mesocoxa and on metaepisternum) and legs partly yellow ( Figure 7b View Figure 7 ). Male genitalia small, epandrium and hypandrium exposed and not covered by sternum 4 ................................................................. 18

18. Abdominal tergum 4 black on posterior 2/5 with yellow fascia on anterior 3/5, emarginate posteromedially and broadening laterally ( Figure 7a View Figure 7 ); antennal base with lateral lobular expansions on each side ( Figure 1 View Figure 1 ) (Sulawesi).................................. ......................................................................................................... A. marissae Mengual View in CoL sp. nov.

– Abdominal tergum 4 entirely black, sometimes with purple gloss ( Figures 6a View Figure 6 , 11c View Figure 11 ); antennal base normal, without lateral expansions ........................................................... 19

19. Wing entirely microtrichose: cell BM microtrichose; anal lobe and cell CuP microtrichose ( Figure 6a View Figure 6 ); alula mostly bare (New Guinea, Sumbawa and Luzon)............... ................................................................................................................................. A. loriae (Meijere) View in CoL

– Wing bare basomedially: cell BM bare on basal 1/5 or more; cell CuP and anal lobe bare basally ( Figures 11c View Figure 11 , 14c, d View Figure 14 ); alula mostly bare........................................................ 20

20. Cell R entirely microtrichose; cell BM bare on basal 1/3 – 1/2 ( Figures 11c View Figure 11 , 14d View Figure 14 ) (Kai Islands, Misool, New Guinea, New Ireland, and Woodlark islands)................................... ........................................................................................................................... A. tripartita (Walker) View in CoL

– Cell R bare on basal 1/3 – 1/2; cell BM bare on basal 1/2 or more ( Figures 4c View Figure 4 , 14c View Figure 14 ) ( Moluccas (Maluku and North Maluku Provinces), New Guinea, New Ireland, and Australia)............................................................................................................ A. bicolor (Austen) View in CoL

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Syrphidae

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