A taxonomic revision of the genus Xylota Meigen (Diptera: Syrphidae) in Korea Author Jeong, Soo-Hyun Author Han, Ho-Yeon text Zootaxa 2019 2019-08-29 4661 3 457 493 journal article 25863 10.11646/zootaxa.4661.3.3 81a32fc3-9362-4ec2-b507-54859001f1e0 1175-5326 3446340 28EFDB26-4C37-4DA9-ABBB-122083EE396B Xylota orientiflorum sp. n. (Korean name: dong-yang-kkot-heo-ri-kkot-deung-e) Figs 1Q , 2Q , 5 O–S, 11A–D, 13F Diagnosis. This species can be readily distinguished from the other Korean Xylota species by the following characters: 1) two small orange-yellow maculae on tergite 2; 2) two widely rectangular maculae on tergite 3; 3) area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle in male and small area immediately anterior to ocellar triangle in female) covered with yellowish pile ( Fig. 1Q ); and 4) scutal area anterior to wing base with black pile. See also Diagnosis of X . abiens . FIGURE 5. Leg, head and body of Xylota species. A–E . X. hauseri sp. n. : (A dorsal view, C lateral view) male body; (B) male left metafemur, anterior view; (D dorsal view, E antero-lateral view) male head. 5F–N . X. ignava : (F, J) male body; (G) female body; (H) male left metafemur, anterior view; (I) female left metafemur, anterior view; (K, L) male head; (M, N) female head. 5O–S . X. orientiflorum sp. n. : (O, Q) male body; (P) male left metafemur, anterior view; (R, S) male head. Description. MALE . Body length 12.3–13.8mm ; wing length 8.5–9.0mm. Head black; face with dense white pollinosity ( Fig. 5R, S ); posterior 1/3 of frons anterior to eye contiguity with yellowish white pollinosity ( Figs 1Q , 5R, S ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) covered with yellowish pile ( Fig. 1Q ). Thorax entirely black; scutum subshiny black with appressed short yellow pile, but posterior half sparsely with longer erect white pile mixed with short pile; anterior anepisternum covered with yellowish pollinosity; posterior anepisternum with yellow and apically curly pile and dense yellowish white pollinosity; anepimeron covered with yellow pile; katepisternum moderately covered with whitish yellow pollinosity, dorsal posterior area with yellow pile; notopleuron covered with yellow pile; scutal area anterior to wing base with black pile; postalar callus mainly covered with long yellow pile and anterior proximal portion with few black pile; metasternum with yellowish white pruionosity. Wing almost entirely with pale brownish tinge ( Fig. 5O ), pterostigma brown; halter with basal half of stem dark brown but posterior stem and knob yellow. Legs: femora black; tibiae dark brown to with basal 1/3 pale yellow; pro- and mesotarsomeres 1 and 2 yellow, tarsomere 3 yellow but dorsal half brown, tarsomeres 4 and 5 dark brown to black; metatrochanter with elongated and sharp calcar (at least twice as long as basal width) ( Fig. 5P ); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with few spinose setae, antero-dorsally and postero-ventrally with long yellow pile but apico-dorsal 1/4 area black setulae; metatarsomeres 1–3 yellowish brown, tarsomeres 4 and 5 dark brown to black ( Fig 5P ). Abdomen about 3.5x longer than wide ( Figs 2Q , 5O ), almost parallel-sided but slightly broaden medially, with posteriorly widened tergum 2 ( Figs 2Q , 5O ); preabdominal terga black in ground color; tergum 2 medialy with pair of relatively small roundish orange-yellow maculae, separated from each other roughly by diameter of each macula ( Figs 2Q , 5O ); tergum 3 with pair of larger subrectangular maculae, separated from each other by about 1/3 width of each macula ( Figs 2Q , 5O ). Male genitalia ( Figs 11 A–D, 13F): surstylus with dorsal lobe elongated about 1.5 x as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with short setulae ( Fig. 11 A–C); ventral lobe of surstylus bulged widely with apex setulose, ( Fig. 11 A–C); cercus cordated in profile with long pale pile ( Fig. 11 A–C); lingula indistinct ( Fig. 13F ); fenestra round in outline ( Fig. 11 A–C); spur of superior lobe reduced ( Fig. 13F ); superior lobes asymmetric( Fig. 11 A–C); right lateral arm of theca ( Fig. 11C ) apically with large ventrally hooked process, apico-ventrally with eaqually large ventrally hooked process but with additional tooth dorso-subapically; left lateral arm of theca ( Fig. 11B ) apico-dorsally round and ventrally three denticles; aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round ( Fig. 11D ); ejaculatory process short ( Fig. 11D ); ejaculatory apodeme apically enlarged and bowl shaped. FEMALE. Unknown. Type material. HOLOTYPE : ♂ , South Korea , Gyeongsangnam-do , Yangsan-si , Ungsang-eup , Simyangsa , N35°23‘38“ E129°11‘32“ , 6.VII.2008 , DS Choi ( NIBR ) . PARATYPES . 1♂ , South Korea , Jeollanam-do , Gwang- yang-si, Ongnyong-myeon , Mt. Baegunsan from jinteul, N35°6‘23“ E127°37‘17“ , 23. VI .2015, Y.B. Lee et al . ( YSUW ) ; 1♂ , Gyeongsangnam-do , Yangsan-si , Yongdanag-dong , Mt. Daeunsan , N35°24‘06“ E129°12‘48“ , 3.VII.2009 , HS Lee et al . ( NIBR ) . Distribution. Korea . Remarks. Among about 10 Palaearctic Xylota species with yellow pattern on tergum 2 and 3, this new species appears unique in having a pair of relatively small orange-yellow maculae of tergum 2 as well as a pair of larger subrectangular maculae on the tergum 3 ( Figs 2Q , 5O ). Its male genitalic characteristics (especially the large ventrally hooked process on apex of right leteral arm of theca; Fig. 11C ) further support the new species status. Etymology. The specific epithet is an adjective derived from the Greek ‘ orienti’ , meaning eastern, and the Greek ‘ florum’ , meaning flower. It is named because this species is similar to the European X. florum ( Fabricius, 1805 ) .