Asiobaccha bimaculata ( Keiser, 1952 ), Mengual, Ximo, 2016

Mengual, Ximo, 2016, A taxonomic revision of the genus Asiobaccha Violovitsh (Diptera: Syrphidae), Journal of Natural History 50, pp. 2585-2645: 2600-2602

publication ID

http://doi.org/ 10.1080/00222933.2016.1206634

publication LSID

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

DOI

http://doi.org/10.5281/zenodo.4333777

persistent identifier

http://treatment.plazi.org/id/B23987DC-FF89-FFD0-5E28-D79CFE33FE03

treatment provided by

Carolina

scientific name

Asiobaccha bimaculata ( Keiser, 1952 )
status

comb. nov.

Asiobaccha bimaculata ( Keiser, 1952)   comb. nov.

( Figure 5a, b, e View Figure 5 )

Baccha bimaculata Keiser, 1952: 161   . Holotype: ♀, NMB. Type locality: Indonesia: Langgai. Baccha (Allobaccha) bimaculata   of Knutson et al. 1975: 321.

Differential diagnosis

Dark species with yellow face and scutellum ( Figure 5a, e View Figure 5 ), with broad alula, and infuscated wing, which is bare basally (including basal part of cell R) ( Figure 5b View Figure 5 ). It has a well-defined mesonotal collar, and the metatarsus is bicolourous ( Figure 5a View Figure 5 ). The most similar species is A. nubilipennis   , but A. bimaculata   differs from it by having tergum 3 black with two medial subtriangular yellow maculae, pointing anteriorly and not reaching lateral margins ( A. nubilipennis   has a complete yellow fascia on tergum 3) and the colour of the pleural pollinosity (golden in bimaculata   and white-yellow in nubilipennis   ). Another characteristic to separate both species is the colouration of the metafemur; A. bimaculata   has the metafemur dark brown with a yellow apex, while A. nubilipennis   has a yellow metafemur with a medial dark annulus.

Variation. A paler specimen has metafemur yellow very basally and apically.

Length (N = 4). Body, 12.7 – 14.0 (13.2) mm; wing, 10.5 – 12.7 (11.3) mm.

Geographical distribution

Species known from Sumba Island.

Type locality

Indonesia: East Nusa Tenggara Province, Pulau Sumba, Sumba Tengah ( Central Sumba Regency , Langgai , 10°03 ’ S, 120°28 ʹ E. GoogleMaps  

Material examined

Type material. Holotype, female, deposited in the Naturhistorisches Museum (Basel, Austria) and labelled: ‘ TYPUS ’ [red] ‘C.- SUMBA // Langgai // 16.7.1949 // Expedition // Bühler-Sutter ’, ‘ HOLOTYPE // Asiobaccha   // bimaculata   // (Keiser) // det. X. Mengual 20 14’

[red] (specimen photographed). Paratypes: ‘ PARA- // TYPUS ’, ‘C.- SUMBA // Langgaliru // 5.10.1949 // Expedition // Bühler-Sutter ’, ‘ PARATYPE // Asiobaccha   // bimaculata   // det. X. Mengual 20 14’ [yellow] [1♀, NMB]; ‘ PARA- // TYPUS ’, ‘O.- SUMBA // Lalukku // 7.7.1949 // Expedition // Bühler-Sutter ’, ‘ PARATYPE // Asiobaccha   // bimaculata   // det. X. Mengual 20 14’ [yellow] [1♀, NMB].

Nontype material. INDONESIA: East Nusa Tenggara Prov., Sumba, near Lewapaku, km 57 on Waingapu to Waikobubak road, 9 – 12 December 1985, J   .D. Weintraub [1♀, USNM, USNMENT 00890789 View Materials ]   .

NMB

Naturhistorishes Museum

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Diptera (awaiting allocation)

Genus

Asiobaccha

Loc

Asiobaccha bimaculata ( Keiser, 1952 )

Mengual, Ximo 2016
2016
Loc

Baccha bimaculata

Knutson LV & Thompson FC & Vockeroth JR 1975: 321
Keiser F 1952: 161
1952