Rohdendorfia bella Mengual, 2019

Mengual, Ximo & Barkalov, Anatolij V., 2019, Two new species of Rohdendorfia (Diptera: Syrphidae) from Central Asia, Acta Entomologica Musei Nationalis Pragae 59 (1), pp. 325-336 : 327-329

Rohdendorfia bella Mengual , sp. nov.

( Figs 2–8 , 9–11 )

Type locality. India, Jammu and Kashmir State, Ladakh, near Tso Moriri (lake), 32°54′ N 78°18′ E, 5333 m a.s.l.

Type material. HOLOTYPE: ♁, “ INDIA: Jammu and Kashmir State, // Ladakh, near Tso Moriri (lake), // 32°54′N 78°18′E, 5333 m, // 25–28. viii.2010. // Leg.: I. Abela-Hofbauerová ” “DNA voucher specimen // ZFMK, Lab code // D268 // Bonn, Germany” “HOLOTYPE // Rohdendorfia // bella // Mengual 2018 ” [red label]” “ ZFMK DIP // 00027140” [barcode] [ ZFMK] . PARATYPES: INDIA: Jammu and Kashmir State, Ladakh, near Tso Moriri (lake), Leg. I. Abela-Hofbauerová (all specimens): 8 ♀♀, 5052 m, 25–28.viii.2010 [ ZFMK, ZFMK- DIP-00027162,...27163,...27164,...27165,...27166,...27167,...27168, ...27206–DNA voucher D305]; ♀, 5053 m, 25–28.viii.2010 [ ZFMK, ZFMK-DIP-00027208]; ♁, 5053 m, 25–28.viii.2010 [ ZFMK, ZFMK- DIP-00027209]; 4 ♁♁, near the camp site, 5330 m, 25–28.viii.2010 [ ISEA, ZFMK-DIP-00027141; ZFMK, ZFMK-DIP-00027142,...27213, ...27214]; 12 ♀♀, near the camp site, 5330 m, 25–28.viii.2010 [ ISEA, ZFMK-DIP-00027175; ZFMK, ZFMK-DIP-00027169,...27170,...27171,...27172,...27173,...27174,...27176,...27177,...27178,...27215, ...27216]; 4 ♀♀, 5050 m, 25–28.viii.2010 [ ZFMK, ZFMK- DIP-00027179,...27180,...27181, ...27182]; 5 ♁♁, 5333 m, 25–28. viii.2010 [ CNC, ZFMK-DIP-00027145, ZFMK, ZFMK-DIP-00027146,...27147, 27212, ...27207–DNA voucher D307]; 25 ♀♀, 5333 m, 25–28. viii.2010 [ CNC, ZFMK-DIP-00027204; ISEA, ZFMK-DIP-00027184, ...27197; ZFMK, ZFMK-DIP-00027183,...27185,...27186,...27187,...27188,...27189, ...27190–DNA voucher D271,...27191,...27192,...27193,...27194,...27195,...27196,...27198,...27199,...27200,...27201,...27202,...27203,...27205,...27210, ...27211]; ♀, 5700 m, 20–23.viii.2010, with Potentilla pamirica , Arenaria bryophylla , Thylacospermum sp. [ ZFMK, ZFMK-DIP-00027161]; ♀, 5685 m, 20–23. viii.2010, with Potentilla pamirica , Astragalus confertus , Thylacospermum sp. [ ZFMK, ZFMK-DIP-00027160]; ♁, 5035 m, 25–28.viii.2010 [ ZFMK, ZFMK-DIP-00027144]; 2 ♀♀, 5035 m, 25–28.viii.2010 [ ZFMK, ZFMK-DIP-00027159, ...27217];♁, 5340 m, 25–28.viii.2010 [ ZFMK, ZFMK-DIP-00027143]; 11 ♀♀, 5340 m, 25–28.viii.2010 [ ZFMK, ZFMK-DIP-00027148,...27149,...27150,...27151,...27152,...27153,...27154,...27155,...27156,...27157, ...27158].

Description. Male. Head ( Figs 2−3, 6 ). Face black, with distinct facial tubercle, concave below antennal insertion, pale pilose, with grey silver pollinosity laterally and below antennae leaving central area of tubercle shiny. Mouth edge protruding, laterally shiny. Gena black, broad, shiny, pale pilose. Lunule black, shiny. Frontal triangle black, pale pilose with some black pile laterally at level of antennal insertion, shiny medially with grey silver pollinosity laterally on eye margin. Eye bare, slightly dichoptic (distance between eyes in dorsal view equal to diameter of ommatidium). Vertical triangle slightly upraised, black, shiny, pale pilose. Antenna black; arista black, thick. Occiput black, pale pilose, with grey silver pollinosity on ventral 2/3.

Thorax ( Figs 2−3 ). Scutum and scutellum black, shiny with blue metallic iridescence, with short pale pile; postpronotum bare; subscutellar fringe with pale pile. Pleuron black, shiny, pale pilose; metaepisternum and metasternum bare; calypter pale; plumula large, pale; halter pedicel and capitulum pale; posterior spiracular fringes yellow. Wing hyaline, entirely microtrichose; stigma dark brown. Alula broad, broader than costal cell. Legs entirely black, with short pile, except metafemur with some long pale pile anteroventrally, shorter than width of metafemur.

Abdomen ( Figs 2−3 ). Unmargined, parallel-sided, pale pilose on lateral margins, black pilose medially; terga 1–3 with long pale pile on lateral margins. Terga 1 and 2 black; terga 3 and 4 black with two squarish yellow maculae; terga 5 and 6 black; sternum 1 dark, yellow posteriorly; sternum 2 yellow, darker medially; sterna 3–5 yellow; sterna 6–8 dark. Male genitalia as in Figs 9−11 .

Female ( Figs 4–5, 7 ). Similar to male except for normal sexual dimorphism and: face and frons shiny, except lateral grey silver pollinose vitta on each side; on frons, these pollinose vittae run on eye margin dorsally up to half distance between antennal insertion and anterior ocellus. Metafemur with short pile. Abdominal sterna entirely yellow; tergum 1 black; terga 2–5 yellow with black fascia on posterior margin, and sometimes along some lateral margin of these terga.

Variation. Some male paratypes have 2 smaller yellow maculae on tergum 2 and/or basal yellow fascia on tergum 5. Size of abdominal yellow maculae varies among specimens studied.

Length (n=5). Body: 7.9 mm (7.5–8.1); wing: 6.1 mm (5.5–6.2).

Genetics. The GenBank accession numbers for this species are: 28S rRNA gene ( MH282902 , specimen ZFMK-DIP-00027140; MH282903 , specimen ZFMK-DIP-00027190), 18S rRNA gene ( MH282904 , specimen ZFMK-DIP-00027140; MH282905 , specimen ZFMK-DIP-00027190), COI gene ( MH282897 , specimen ZFMK-DIP-00027140; MH282898 , specimen ZFMK-DIP-00027190; MH282899 , specimen ZFMK-DIP-00027206; MH282900 , specimen ZFMK- DIP-00027207). All the obtained COI sequences were identical, with only one nucleotide change in the specimen ZFMK-DIP-00027190 compared to the other three specimens. The two 28S rDNA sequences and the two 18S rDNA sequences were identical, respectively.

Differential diagnosis. This new species is very similar to R. khakimovi Barkalov sp. nov. Males of R. bella Mengual sp. nov. have short pile on protibiae, and metafemora with some long pale pile medially, but shorter than metafemur width. They can be distinguished from males of R. montivaga and R. khakimovi Barkalov sp. nov. by the shape of the male genitalia (see Figs 9−14 ) and from the males of R. dimorpha by the pilosity of the metafemur and by the male genitalia. As stated by BARKALOV & NIELSEN (2010) and corroborated by the present study, females of R. montivaga and R. dimorpha are sometimes indistinguishable, and the presence of conspecific males may help to identify them. Females of R. bella Mengual sp. nov. are very similar to those of R. montivaga and R. dimorpha , and they can only be separated from them using the distribution of the specimens, DNA barcodes, or conspecific males. Females of R. khakimovi Barkalov sp. nov. can be distinguished from females of these three taxa using the grey pollinosity on frons as stated in the key.

Etymology. The specific epithet is derived from the Latin bellus meaning pretty, lovely ( BROWN 1956: 130). Species epithet to be treated as an adjective.

Biology. Some paratypes were collected in areas with Potentilla pamirica Th.Wolf , Arenaria bryophylla Fernald , Thylacospermum sp., and Astragalus confertus Bunge.

Geographical distribution. Only known from the Ladakh region, in northwest India. The studied specimens are the first records of the genus Rohdendorfia collected in India, and the first individuals from the state of Jammu and Kashmir.

Figures

Figs 2–8. Rohdendorfia bella Mengual, sp. nov. 2–3 – holotype male (ZFMK-DIP-00027140). 2 – dorsal view; 3 – lateral view. 4–5 – paratype female (ZFMK-DIP-00027194); 4 – dorsal view; 5 – lateral view. 6 – holotype male, frontal view. 7 – paratype female (ZFMK-DIP-00027194), frontal view. 8 – holotype male, metaleg, lateral view. Scale bars: 2–5 – 1 mm, 6–8 – 0.5 mm..

Figs 9–17. Male genitalia. 9–11 – Rohdendorfia bella Mengual, sp. nov. 9 – epandrium, dorsal view; 10 – epandrium, lateral view; 11 – hypandrium, lateral view. 12–14 – Rohdendorfia khakimovi Barkalov, sp. nov. 12 – epandrium, dorsal view; 13 – epandrium, lateral view; 14 – hypandrium, lateral view. 15–17 – Rohdendorfia alpina Sack, 1938 (adapted from CLAUSSEN 1988). 15 – epandrium, dorsal view; 16 – epandrium, lateral view; 17 – hypandrium, lateral view. Scale bars = 0.2 mm.