Spazigasteroides a new genus from China with a black face and scutellum in the Syrphini (Diptera: Syrphidae)

Abstract

In the present paper, the genus Spazigasteroides gen. nov. (Diptera, Syrphidae), with Spazigasteroides caeruleus sp. nov. as type species, is described from China. The new genus bears the following characters: Head strongly concave posteriorly and closely appressed to thorax so that the bare postpronota are entirely hidden. Face black in ground colour. Antennae short, with basoflagellomeres slightly longer than wide. Scutellum black. Postmetacoxal bridge incomplete. Legs simple, slender. Wing vein R 4+5 straight, vein r-m at basal third of cell dm. Abdomen petiolate, longer than head and thorax together. Male aedeagus two segmented. Based on the subdivision of Syrphinae by Vockeroth (1992), the new genus belongs to the tribe Syrphini, it is separated from the genera of the tribe Syrphini by both the face and scutellum black. In appearance the new genus is also similar to the genus Spazigaster Rondani, the tribe Bacchini, but it is differentiated from the genera of the tribe Bacchini by the two segmented aedeagus.

Phylogenetic relationships of the bacchine flower flies (Diptera: Syrphidae) based on molecular characters, with a description of a new species of Melanostoma (Schiner, 1860)

“…Classically, Bacchini is defined as Syrphinae taxa with the aedeagus of the male genitalia rather simple, undivided (Vockeroth, 1969(Vockeroth, , 1992, and face and scutellum entirely black. The coloration of the face and scutellum is no longer a defining characteristic for Bacchini as there are Bacchini species with pale parts of the face (Vockeroth, 1990;Thompson, 1999) and Syrphini species with face and scutellum entirely black (Vockeroth, 1969(Vockeroth, , 1990Huo, 2014). The tribe Bacchini sensu lato, hereafter the members of Syrphinae with a simple aedeagus, has undergone several modifications in its definition, mostly due to the concept of the genus Baccha Fabricius, 1805, which ended up to an extremely diverse tribe (Vockeroth, 1969).…”

Description of six new large species of Argentinomyia Lynch-Arribálzaga, 1891 and redescription of Talahua fervida (Fluke, 1945) (Diptera, Syrphidae, Syrphinae)

“…Figures of some characters employed in the key correspond to those treated in the chapter of Syrphidae in the Manual of Central America Diptera (Thompson et al 2010) and are indicated by the abbreviation "MCAD". The specimens were determined to genus level using the keys of Thompson et al (2010), Huo (2014) and Thompson and Skevington (2014). Our new species were compared with type specimens of twenty-seven Argentinomyia species and one of Talahua deposited in the AMNH, BMNH, USNM, and WIRC collections (Suppl.…”

“…The new key was modified based on characters provided by Thompson (1999), Thompson et al (2010), Huo (2014), Thompson and Skevington (2014) and Ramage et al (2018). 12C); abdomen elongated, with large markings on the terga, sometimes with a transverse fascia on the third or with a pair of small maculae in the basal corners of fifth tergum (Fig.…”

“…Argentinomyia is distinguished from other genera of Bacchini by the combination of: 1) long antenna, with scape much longer than broad; 2) basoflagellomere oval or slightly elongate; 3) face straight in profile, not produced anteriorly, generally with pollinosity broadly punctuate, tubercle low, usually with transverse grooves dorsally or pollinosity broadly punctuate; 4) metacoxa without posteromedial pile on apical angle; 5) abdomen dark colored, often with variously shaped light-colored yellow, orange to silvery-grey pollinose paired maculae; triangular to quadrate or oval markings on 2 nd to 4 th abdominal tergite, sometimes including a small macula on 5 th tergite, and 6) male genitalia normal size, superior lobes triangular to rectangular, irregular in shape and cercus short (Fluke 1945(Fluke , 1957Thompson 1999;Huo 2014;Thompson and Skevington 2014).…”

Biema Huo & Zhao gen. nov., a new flower fly genus (Diptera, Syrphidae) from China

“…The old concept of the tribe Bacchini Bigot, 1883 has recently been extensively discussed (Huo 2014;Thompson & Skevington 2014). The tribe as defined by Vockeroth (1992) for those syrphines with an unsegmented phallus is now divided into two tribes, i.e., Bacchini and Melanostomini Williston, 1885 (Mengual 2020).…”