Eumerus badkhyziensis Mutin, 2019

Mutin, V. A., 2019, A new species of the genus Eumerus Meigen, 1822 (Diptera: Syrphidae) from Turkmenistan, Far Eastern Entomologist 397, pp. 9-12 : 10-11

Eumerus badkhyziensis Mutin , sp. n.

http://zoobank.org/NomenclaturalActs/ E251F7B6-2EB2-4879-A6EE-0BB055A3CABD

Figs 1–5

TYPE MATERIAL. Holotype – ♂, Turkmenistan: Bathyz State Nature Reserve , Eroyulanduz, 16.V 1990, leg. A. Lelej [ FCBV].

DESCRIPTION. MALE. Body length (excluding antenna): 5,0 mm; wing length: 3,5 mm.

Head. Eyes bare, distinctly dichoptic. The shortest distance between eyes more than width of basoflagellomere. Ratio minimal width of frons: width of head 1,2: 7; ratio width of ocellar triangle: width of head 1,5: 7. Face dull black, with white pile. Frons and vertex shinning black with a bluish tinge, covered white erect pile, which is shorter than width of flagellomere. Ocellar triangle isosceles-obtuse. Distance from anterior ocellus to level of posterior ocelli equal to distance from posterior ocellus to level of upper eye corners. Antenna mainly orange, weakly darkened dorsally, with scattered silvery pollinosity; basoflagellomere rather oval (ratio length: width 1,1: 1), with the distal part weakly pointed ventrally; arista orange and thickened basally, with brownish apical part ( Fig. 5 ).

Thorax mainly shinning black with a bluish tinge, except posterior and ventral plates of the mesothoracic pleuron brown, with white short pile. Mesonotum without pollinose vittae.

Katepisternum with sparse short pile on upper half and some pile near ventral margin.

Scutellum sub-rectangular, with rather broad rim.

Legs pale pilose. Coxae and trochanter brownish. Pro- and mesofemur mainly brown,

except apical 1/3 yellow. Metafemur moderately thickened, mainly brown except apical ¼

orange, with row of 5–6 spines on anterior ridge and row of 3 spines on posterior ridge.

Tibiae orange; metatibia rather flattened baso-ventrally, with subapical darkish annulus-like mark. Tarsi entirely yellow; setae on mesotarsus brownish.

Wing. Membrane hyaline, with microtrichia. Veins yellowish; pterostigma about same color as the wing. Vein R4+5 weakly curved. Halter white.

Abdomen whole reddish, with short appressed pale pile; 1st tergum darkened with a bluish tinge; 2nd, 3rt and 4th terga with pairs of white pollinose transverse maculae.

Genitalia ( Figs 3, 4 ). The apex of posterior lobe of surstylus conically pointed. Hypandrium strongly thickened in basal part, then smoothly tapering apically.

FAMALE. Unknown.

DIAGNOSIS. New species differs from other species of the genus with red abdomen by the following combination of external characters: bare dichoptic eyes, orange antennae, wing without dark spot, pale pilosity of whole body and legs mainly orange. Known Palaearctic species with distinctly dichoptic eyes and mainly red abdomen ( Eumerus alajensis Peck,

1966, E. arkitensis Peck, 1969 , E. binominatus Hervé-Bazin, 1923 , E. falsus Becker, 1922 ,

E. kirgisorum Peck, 1971 , E. nigrifacies Becker, 1921 , E. pamirorum Stackelberg, 1949 , E.

selevini Stackelberg, 1949, E. tadzhikorum Stackelberg, 1949 ) have more or less visible pilosity on eyes. Species with red or partly red abdomen, known only for females, have also pilose eyes ( E. grisescens Becker, 1921 , E. pavlovskii Stackelberg, 1964 , E. palaestinensis

Stackelberg, 1949, Eumerus rubescens Villeneuve, 1912 ), which allows us to distinguish them from a new species. Genitalia of new species is similar to one of E. sinuatus Loew, 1855

by posterior lobe of surstylus conically pointed and the form of the hypandrium in outline,

but mostly external characters of these species are very different.

The new species is very likely related to E. falsus Becker 1922 . In the key to Palaearctic

Eumerus species (Stackelberg 1961), the new species keys out to falsus . Both species share the following characters: dark wingspot absent, orange antennae, isosceles-obtuse ocellar triangle, mesonotum without vittae of white pollinosity, moderately thickened metafemur. The male genitalia of E. falsus are not published, but from the description and photographs of specimens the two species can separated by the following characters ( falsus characters in parenthesis): eyes bare (eyes covered with hairs), body size 5 mm (10-12 mm), ration vertex width at posterior ocelli: head-width 1: 3,5 (1: 4,5). Eumerus falsus is the replacement name for Eumerus rubriventris Becker, 1921 (= homonym of rubriventris Macquart, 1829 ) and

Eumerus latifrons Sack 1932 and Eumerus zurudnyi Stackelberg 1949 are synonyms of it.

The known distribution of E. falsus spans from Israel, Syria, Turkey, Iran to Turkmenistan and Tadjikistan (Stackelberg 1961), which would make the two species likely sympatric.

DISTRIBUTION. Turkmenistan (Bathyz State Nature Reserve, Eroyulanduz Depression).

ETHYMOLOGY. Species name is the Latin adjective from the Bathyz Plateau.

same, lateral view; 3 – epandrium, lateral view; 3 – hypandrium, lateral view; 5 – antennae,

lateral view. Scale bar: 1, 2 = 1.0 mm; 3–5 = 0.1 mm.

Figures

Figs 1–5. Eumerus badkhyziensis Mutin, sp. n., holotype ♂. 1 – habitus, dorsal view; 2 –