Spazigasteroides caeruleus, Huo, Ke-Ke, 2014

Huo, Ke-Ke, 2014, Spazigasteroides a new genus from China with a black face and scutellum in the Syrphini (Diptera: Syrphidae), Zootaxa 3755 (3), pp. 230-240 : 231-234

Spazigasteroides caeruleus sp. nov.

( Figs 1–14 )

Type material. Holotype: ♂, CHINA: Ningxia Hui Autonomous Region, Xixia, Jingyuan county, 2008-VII-8, Huo Ke-Ke (MABSUT); paratypes: same data as holotype (11♂; 1♂, in SSY; same data as holotype, but with followings date: 2008-VII-15 (11♂ 2♀, MABSUT, 1♂ 1♀, at USNM (National Museum of Natural History, Washington DC, USA)); same locality and collector, but with following date: 2008-VII-11 (1♂, MABSUT); Ningxia Hui Autonomous Region, Xixia, Jingyuan county, 2008-VII-7, Huo Ke-Ke (4♂, MABSUT); Ningxia Hui Autonomous Region, Xiaonanchuan, Jingyuan county, 2008-VII-11, Huo Ke-Ke (1♀, MABSUT); Ningxia Hui Autonomous Region, Wuguliang, Jingyuan county, 2008-VII-16, Huo Ke-Ke (1♂ 3♀, MABSUT); same data as above, but with following dates: 2008-VII-17, Huo Ke-Ke (4♂ 1♀, MABSUT); Ningxia Hui Autonomous Region, Erlonghe, Jingyuan county, 2008-VII-19, Huo Ke-Ke (1♀, MABSUT); Ningxia Hui Autonomous Region, Liangdianxia, Jingyuan county, 2008-VII-20, Huo Ke-Ke (2♂ 3♀, MABSUT); Shaanxi Province, Yingpan town, Liuba county, 2008-VIII-30, Huo Ke-Ke (1♂, MABSUT).

Etymology. The new name is derived from the Latin word caeruleus (sky-blue), referring to wing with steel blue reflection in sunshine from some views.

General appearance: medium-sized fly with a black face and scutellum, wing deep brown on anterior margin, with metallic steel blue reflections, abdomen petiolate, second abdominal segment slightly constricted, with a pair of long, transparent, whitish yellow lateral maculae dorsally, abdominal sternum 2 whitish, nearly transparent, aedeagus two segmented.

Description. Male. Body length: 13–15 mm; wing length: 11–13 mm. Head. Wider than thorax, about 1.4 times as high as long, 1.29 time as broad as high. Black, with barely dark steel blue reflection. Eye holoptic, contiguity as long as 1/3 of frons; brown, densely dark brown pilose, whitish on lower part from some view. Vertical triangle long black pilose, narrowly elongate, about 2 times as long as eye contiguity. Ocellar triangle located before the middle of vertical triangle. Frontal triangle long black pilose, polished black anteriorly, thinly covered with whitish pollen basally along eye margins. Lunule shiny black, circularly protruded medially on anterior margin. Antennal pits confluent. Face concave below frontal prominence, facial tubercle nose-shaped, abrupt ventrally, at lower 1/3 of head. Face long black pilose and whitish pollinose laterally, white pilose near oral margin, leaving a longitudinal medial vitta which gradually tapers above facial prominence and not extends to antennal base. Gena black, white pollinose and long pilose, intermixed with sparse long black pile. Head concave posteromedially and entirely appressed to postpronotum; occiput narrow dorsally with black pile, broad laterally with white pollen and pile. Antenna black, black pilose on dorsal and ventral margins of scape and pedicel, basoflagellomere nearly as long as scape and pedicel combined together, slightly longer than wide, obtusely rounded apically; arista long, black with black pubescence. Thorax. Longer than wide. Postpronotum white pollinose. Scutum black with dark metallic steel blue reflection, sparsely brown pollinose, viewed posteriorly in medial portion with a pair of longitudinal grey pollinose vittae which extend beyond transverse suture; scutum short black pilose, intermixed with long black pile on posterior 1/3; pile on lateral margin longer, with some white pile intermixed posterior to postpronotum and thicker, bristly black pile above wing base and postalar callus. Notopleuron with thick, long black pile, intermixed with a few white pile. Scutellum 2.5 times as wide basally as long, black with dark blue tinge, sparsely grey pollinose, short whitish pilose, intermixed with a few short black pile, some long white pile, and a few long black pile basally, of which long pile about 5-6 times as long as short ones. Ventral scutellar fringe white, long, dense. Pleuron black with dark blue reflection, with sparse grey pollen which forms maculae on posterior anepisternum, dorsal katepisternum and anterior anepimeron, long whitish pilose on pronotum, posterior convex portion of anepisternum, anterior anepimeron, meron and anterior corner of katepisternum. Katepisternum with broadly separated dorsal and ventral pile patches, the latter of which smaller, distribute only along ventral medial line of thorax. Katatergum short light pubescent. Metasternum bare. Postmetacoxal bridge incomplete. Legs. Simple, slender, long, black, with femora thinly whitish pollinose. Pile on legs black, short, except for long white pile on coxae and trochanters, longer black and a few white pile on pro- and metafemora posteroventrally. Metafemur with posteroventral long black pile curved apically on apical portion. Metacoxa bare posteromedially. Metatarsus as long as tibia. Wing. Tinged with steel blue in sunshine from some views, deep brown on anterior margin (anterior to vein R4+5 and anterior portion of cell r), otherwise hyaline. Vein R4+5 straight, crossvein r-m at basal third of cell dm, vein M1 sinuate, joined with vein R4+5 and M2 at right angle; cell r2+3 open, cell cup petiolate, petiole about as long as crossvein h. Wing membrane microtrichose, except bare on basal 4/5 of cells r (posterior to spurious vein), bm (except for apex and posterior area along veins) and basal portion of cup and areas along veins; anal lobe with two vittate bare regions, alula mostly bare except for microtrichose margin. Calypteres whitish, narrow, distinctly thickened marginally, with dorsal calypter black marginally and short black fringe; ventral calypter whitish marginally and long whitish fringe. Halter dark brown with capitulum black. Abdomen. Elongate, slightly petiolate, longer than head and thorax together, flat; with terga 2, 3 and 4 nearly equal in length; tergum 2 constricted backward, the narrowest part on end of tergum 2, abdomen gradually broadens from tergum 3, the widest part on apical end of tergum 4; the narrowest part of abdomen less than half of the widest part. Abdomen black with dark blue reflection, tergum 2 with a pair of long, transparent, whitish yellow lateral maculae, broadly separated, not extending to margins, inner margin of which nearly arcuate; terga 3 and 4 with indistinct fasciae of whitish pollen, in some individuals tergum 3 with a pair of obscure, rectangular, transparent lateral maculae basally. Pile of abdomen short, black, except white and long pile on tergum 1 and lateral 2/3 of tergum 2 basally, and short white pile on terga 2and 3 basally and tergum 4 basolaterally. Abdominal sterna black, black pilose, with sterna 1 and 2 long whitish pilose; sternum 2 whitish, nearly transparent; sternum 3 with yellowish white apical margin. Genitalia. Black. Cerci dark yellow brown, black pilose. Epandrium longer than high. Surstyli broadly triangular, broadly rounded apically, on outer surface with black bristle-like pile intermixed with long pile basally, short black pilose on inner surface. Surstylar apodeme triangularly convex on posterior margin medially. Hypandrium cylindrical, with triangular lingula on posteroventral margin medially, slightly higher than lateral arms. Superior lobe acute on posterior apex, doublemargined posterodorsally. Aedeagus two segmented, inflated apically, from lateral view aedeagal base acute on ventral margin, with two acute teeth viewed from posterolaterally. Aedeagal apodeme elongate, broadened apically.

Female. Similar to the male but differing in the following features: Body length 11–16 mm; wing length 12–15 mm. Dichoptic, eye whitish pilose. Vertex and frons black pilose; vertex at posterior margins of eyes about 1/5 as broad as head width. Face white pilose, sparser than in male. Scutum and scutellum without long pile. Pile on legs shorter than in male; pro- and mesotibiae slightly brownish basally, femora with posteroventral long pile mostly white. Wing membrane with more extensive bare areas than in male. Tergum 3 with a pair of subrectangular, whitish yellow, transparent, lateral maculae, but obscure in some individuals.

Distribution. The distribution of the new genus/species is given in Fig. 15.

Figures

FIGURES 1 – 14. Spazigasteroides caeruleus sp. nov. 1. habitus, left lateral, male holotype; 2. habitus, dorsal, male holotype; 3. head, left lateral, male holotype; 4. habitus, left lateral, female paratype; 5. habitus, dorsal, female paratype; 6. head, left lateral, female paratype; 7. right antenna, inside, male holotype; 8. superior lobe, male holotype; 9. left wing, dorsal, male holotype; 10. epandrium and appendages, ventral, male holotype; 11. epandrium and appendages, dorsal, male holotype; 12. aedeagus, male holotype; 13. genitalia, lateral, male holotype; 14. hypandrium and appendages, lateral, male holotype.