Asiobaccha Violovitsh, 1976

Mengual, Ximo, 2016, A taxonomic revision of the genus Asiobaccha Violovitsh (Diptera: Syrphidae), Journal of Natural History 50, pp. 2585-2645: 2587-2589

publication ID 10.1080/00222933.2016.1206634

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Asiobaccha Violovitsh, 1976


Genus Asiobaccha Violovitsh, 1976  

Type species Baccha nubilipennis Austen, 1893  

Differential diagnosis

Medium to large species, slender with petiolate abdomen. Face straight with a distinct tubercle; oral opening elongated; antenna short, shorter than face, with

basoflagellomere longer than broad ( Figure 1 View Figure 1 ); antennal pits distinctly separated; eye bare; male holoptic; ocellar triangle narrow. Scutum with or without mesonotal fringe; postpronotum bare; scutellum with or without subscutellar fringe, without bristles. Proepimeron bare; anterior anepisternum pilose on posterodorsal part or dosomedially; metasternum bare; metaepisternum pilose ventrad to spiracle; postmetacoxal bridge incomplete ( Figure 1 View Figure 1 ). Wing with or without alula, with black minute sclerotised dots on posterior wing margin; usually extensively microtrichose, never completely bare. Abdomen petiolate, unmargined; male genitalia small (except in Asiobaccha taronja   sp. nov.) with a segmented aedeagus.

Geographical distribution

Asiobaccha   species are distributed in the Oriental, Australian and Oceanian Zoogeographic Regions, extending into the Sino-Japanese Region sensu Holt et al. (2013). The species with the largest distribution is Asiobaccha nubilipennis   , which occurs from Sri Lanka and India northwards to China and Japan, and south to Indonesia (Sumatra, Java, Sulawesi). However, the genus Asiobaccha   is present farther south to Australia and New Caledonia, and eastwards to Fiji, Tonga, Tuvalu and Samoa, including New Guinea and Solomon Islands ( Figure 2 View Figure 2 ). The highest diversity of the genus occurs in two classic biogeographical designations, Wallacea and Melanesia.

Natural history

Although nothing has been published about the biology of the adults, the author assumes that imagoes of Asiobaccha   feed on pollen and nectar like many other syrphid adults, a fact corroborated by field observations (J. Skevington and A. Young, personal comments).

Very little is known about the immature stages of Asiobaccha   . Muraleedharan and Radhakrishnan (1986) reported larvae of A. nubilipennis   feeding on Aphis (Toxoptera) aurantii Boyer de Fonscolombe, 1841   ( Hemiptera   : Aphididae   ) in tea plantations in Anamallai Hills, India. Additionally, Radhakrishnan and Muraleedharan (1993) gave more details of the immature biology of A. nubilipennis   , such as aphid consumption and larval stages duration, reared from A. aurantii   from southern India. In New South Wales ( Australia), Carver et al. (2003) found a second-instar larva of Asiobaccha notofasciata   sp. nov. feeding on Aphis (Aphis) clerodendri Matsumura, 1917   ( Hemiptera   : Aphididae   ) in a pseudogall of Clerodendrum tomentosum (Vent.) R.Br.