Anu Thompson

Thompson, Christian, 2008, A conspectus of New Zealand flower flies (Diptera: Syrphidae) with the description of a new genus and species, Zootaxa 1716, pp. 1-20: 8

publication ID 10.5281/zenodo.181009

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scientific name

Anu Thompson


Anu Thompson   , gen. nov.

Type-species: Anu una Thompson   , sp. nov.

Small slender flies. Length: 5–6 mm.

Head: Face straight, with distinct medial tubercle, yellow, with or without black medial vitta; oral opening about 1.5 times as long as broad; gena narrow; front not swollen, with slightly divergent side dorsally in female; antennal sockets confluent; eye bare, holoptic in male, with eye contiguity as long as ocellar triangle; antenna short, with basoflagellomere oval; arista long, about as long as antenna.

Thorax: Mesonotum yellow laterally from postpronotum (humerus) to transverse suture; scutellum slightly concave apicomedially so that subscutellum is visible dorsally; subscutellar fringe absent; anterior anepisternum bare; katepisternal pile patches broadly separated throughout; metasternum bare; metathoracic pile patch absent; postmetacoxal bridge absent; legs simple; plumula simple, short. WING: hyaline, extensively microtrichose; vein R 4 + 5 straight; vein M 1 (apical crossvein) oblique, slightly sinuous; alula narrow, about as wide as cell CuP.

Abdomen: 1 st tergum divided into lateral plates by membranous medial area; without marginal sulcus; male with terga 2-4 broadly membranous apicomedially, so abdomen is bent apicodorsally. Male genitalia: surstyles asymmemtric; lingula absent; paramere free; aedeagus two-segmented.

Etymology: Anu   is an arbitrary combination of letters and is to be treated as masculine.

Comparative diagnosis: Anu   is distinguished from all other Syrphidae   by the male terga reduced apicomedially so that the abdomen may be bent into an apicodorsal curve (almost always in dead specimens); the 1 st tergum is divided into lateral plates as the medial area is entirely membranous; and the scutellum is concave apicomedially with the subscutellum greatly produced so as to be visible dorsally. In the last key to the genera of Syrphini ( Vockeroth 1969), Anu   runs to couplet # 24. The statement about the scutellum in couplet # 21 should be ignored; otherwise Anu   agrees well with the rest of the first alternative. Anu   is distinguished from both Exallandra   and Sphaerophoria   by the unique apotypic characters listed above. In appearance and behavior Anu una   is related to Sphaerophoria   . Anu una   looks like and acts like a small Sphaerophoria   species. Anu   , along with Exallandra   , Giluwea   and Sphaerophoria   (including Loveridgeana   ) probably form a monophyletic group characterized by yellow mesonotal vitta, loss or reduced subscutellar fringe, loss or reduced lingula, bare or reduced metasternal pile, and Anu   is probably the sister to Giluwea   as their genitalia are most similar (both have asymmetric surstyli).