Xylota hauseri, Jeong & Han, 2019

Jeong, Soo-Hyun & Han, Ho-Yeon, 2019, A taxonomic revision of the genus Xylota Meigen (Diptera: Syrphidae) in Korea, Zootaxa 4661 (3), pp. 457-493 : 472-473

publication ID	https://doi.org/ 10.11646/zootaxa.4661.3.3
publication LSID	lsid:zoobank.org:pub:28EFDB26-4C37-4DA9-ABBB-122083EE396B
DOI	https://doi.org/10.5281/zenodo.5935696
persistent identifier	https://treatment.plazi.org/id/5A219B24-344B-4728-FCED-FAC19DE01695
treatment provided by	Plazi
scientific name	Xylota hauseri
status	sp. nov.

Treatment

Xylota hauseri View in CoL sp. n.

(Korean name: hauser-heo-ri-kkot-deung-e)

Figs 1F View FIGURE 1 , 2F View FIGURE 2 , 5 View FIGURE 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 View FIGURE 2 , 7A View FIGURE 7 ) vs. more or less parallel-sided ( Figs 2F View FIGURE 2 , 5A View FIGURE 5 ); 2) right lateral arm of theca apico-dorsally with five strong spine-like process ( Fig. 10G View FIGURE 10 ) vs. with finely serrated ( Fig. 12G View FIGURE 12 ).

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 View FIGURE 1 ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1F View FIGURE 1 ). 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 View FIGURE 5 ); 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 View FIGURE 5 ); 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 View FIGURE 5 ); metatarsomere dark brown to black ( Fig. 5B View FIGURE 5 ). Abdomen about 3.5x longer than wide and black with purplish lustrous tinge ( Figs 2F View FIGURE 2 , 5A View FIGURE 5 ); tergum 2 slightly narrowed posteriorly; tergum 3 slightly widened posteriorly ( Figs 2F View FIGURE 2 , 5A View FIGURE 5 ); tergum 2 with black appressed short black pile except laterally inner facing triangular areas covered by white erect pile ( Fig. 2F View FIGURE 2 ); tergum 3 with black appressed short black pile except anterior half laterally inner facing triangular areas covered by white erect pile ( Fig. 2F View FIGURE 2 ). Male genitalia ( Figs 10 View FIGURE 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 View FIGURE 10 E–G); ventral lobe of surstylus blunt but distinctly projected with apex setulose ( Fig. 10 View FIGURE 10 E–G); cercus cordated in profile with long pale pile ( Fig. 10 View FIGURE 10 E–G); lingula indistinct ( Fig. 13H View FIGURE 13 ); fenestra large and subtriangular in outline ( Fig. 10E, F View FIGURE 10 ); spur of superior lobe reduced ( Fig. 13H View FIGURE 13 ); superior lobe asymmetrical; right lateral arm of theca ( Fig. 10F View FIGURE 10 ) 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 View FIGURE 10 ) 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 View FIGURE 10 ); ejaculatory process short ( Fig. 10H View FIGURE 10 ); 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 View FIGURE 10 E–H vs. Fig. 12 View FIGURE 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.