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 hauseri sp. n. (Korean name: hauser-heo-ri-kkot-deung-e) Figs 1F , 2F , 5 A–E, 10E–H, 13D Diagnosis. Among Korean species, Xylota hauseri sp. n. is most similar to X. umbrosa , especially having the purplish lustrous tinge on their black abdominal terga and the apex of the left arm of theca in male genitalia apicodorsally round. However, X. hauseri sp. n. can be distinguished from X. umbrosa by the following characteristics: 1) male abdomen medially constricted in dorsal view ( Figs 2A , 7A ) vs. more or less parallel-sided ( Figs 2F , 5A ); 2) right lateral arm of theca apico-dorsally with five strong spine-like process ( Fig. 10G ) vs. with finely serrated ( Fig. 12G ). Description. MALE . Body length 11.5–11.6mm ; wing length 9.1mm . Head black; with heavily yellowish pollinosity face; posterior 1/5 of frons anterior to eye contiguity with white pollinosity ( Fig. 1F ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1F ). Thorax entirely black; scutum subshiny black with short appressed yellow pile, but posterior half sparsely with longer erect yellow pile mixed with short pile; anterior anepisternum covered with yellowish pollinosity; posterior anepisternum with pale white pile and white pollinosity; anepimeron covered with white pile; katepisternum moderately covered with yellowish white pollinosity, dorsal posterior area with white pile; notopleuron covered with pale yellow pile; scutal area anterior to wing base with black pile; postalar callus covered with whitish yellow pile; metasternum bare with few white pollinosity. Wing entirely with pale brownish tinge ( Fig. 5A ); pterostigma brown; halter with basal 1/3 of stem dark brown and posterior part of stem and knob yellow. Legs: femora dark brown to black; pro- and mesotibiae black with dorso-basal 1/3 yellow; pro- and mesotarsomeres 1 and 2 yellow, tarsomere 3 brown, tarsomeres 4 and 5 dark brown to black; metatrochanter ventrally with short tubercle like calcar (subequal to basal width) ( Fig. 5B ); apico-ventral 1/3 of metafemur with two carinae covered with spinose setuale, remaining ventral area with few spinosesetae; antero-dorsally and postero-ventrally with long yellowish white mixed pile, apico-dorsal 1/3 area with short and black pile; metatibia dark brown to black with basal 1/3 pale yellow ( Fig. 5B ); metatarsomere dark brown to black ( Fig. 5B ). Abdomen about 3.5x longer than wide and black with purplish lustrous tinge ( Figs 2F , 5A ); tergum 2 slightly narrowed posteriorly; tergum 3 slightly widened posteriorly ( Figs 2F , 5A ); tergum 2 with black appressed short black pile except laterally inner facing triangular areas covered by white erect pile ( Fig. 2F ); tergum 3 with black appressed short black pile except anterior half laterally inner facing triangular areas covered by white erect pile ( Fig. 2F ). Male genitalia ( Figs 10 E–H, 13D): syrstylus with dorsal lobe elongated about 1.5× as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with setulae ( Fig. 10 E–G); ventral lobe of surstylus blunt but distinctly projected with apex setulose ( Fig. 10 E–G); cercus cordated in profile with long pale pile ( Fig. 10 E–G); lingula indistinct ( Fig. 13H ); fenestra large and subtriangular in outline ( Fig. 10E, F ); spur of superior lobe reduced ( Fig. 13H ); superior lobe asymmetrical; right lateral arm of theca ( Fig. 10F ) with baso-dorsal thorny processes and apico-dorsal 5 pointed process, with 3 pale pile in between these two processes; left lateral arm of theca ( Fig. 10G ) with baso-dorsal thorny process and apico-dorsally with round apex with 5 denticles, with 3 pale pile in between these two processes; aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round ( Fig. 10H ); ejaculatory process short ( Fig. 10H ); ejaculatory apodeme apically enlarged and bowl shaped. FEMALE. Unknown. Type material. HOLOTYPE : ♂ , South Korea , Gangwon-do , Jeongseon-gun , Nam-myeon , Mt. Mindungsan from Yupyeong-ri to 1119m peak, 4.VII.2007 , H.Y. Han et al . ( NIBR ) . PARATYPE : 1♂ , South Korea , Gangwondo , Jeongseon-gun Nam-myeon , Mt. Mindungsan from Yupyeong-ri to 1119m peak, 17. VI .2007, H.Y. Han , S.W. Suk ( YSUW ) . Distribution. Korea . Remarks. This species and X. umbrosa are closely related because they are very similar both in general appearance (especially similar leg colorations and purplish lustrous tinge on abdominal terga) as well as in male genitalic structures ( Fig. 10 E–H vs. Fig. 12 E–H; see Diagnosis for their separation). Etymology. We named this species after Dr. Martin Hauser, who initially inspired us to study this fascinating genus of Syrphidae in Korea .