Xylota amaculata Yang & Cheng, 1998

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 : 463-464

publication ID	https://doi.org/ 10.11646/zootaxa.4661.3.3
publication LSID	lsid:zoobank.org:pub:28EFDB26-4C37-4DA9-ABBB-122083EE396B
persistent identifier	https://treatment.plazi.org/id/5A219B24-3442-473F-FCED-FAE49E171601
treatment provided by	Plazi
scientific name	Xylota amaculata Yang & Cheng
status

Treatment

Xylota amaculata Yang & Cheng View in CoL

(Korean name: no-rang-kkeut-heo-ri-kkot-deung-e)

Figs 1C View FIGURE 1 , 2C View FIGURE 2 , 3 View FIGURE 3 F–J, 8E–H, 13B

Species new to Korea

Xylota amaculata Yang & Cheng, 1998: 211 View in CoL (type locality: China, Jilin, Mt. Changbai; holotype ♂, BAUC); Huo et al., 2007: 390 (diagnosis); Huang & Cheng, 2012: 670 (illustration and diagnosis).

Diagnosis. This species can be distinguished from the other Korean Xylota species by its dense yellow pile on abdominal tergum 4 ( Fig. 3F View FIGURE 3 ), dark brown metatarsus ( Fig. 3G View FIGURE 3 ) and bare anterior half of frons ( Figs 1C View FIGURE 1 , 3I, J View FIGURE 3 ). The following redescription is based on the only available male specimen.

Description of Korean material. MALE. Body length 12.5mm; wing length 9.9mm; predominantly black species. Head black; face with dense yellow pollinosity except for area under antennae; posterior half of frons anterior to eye contiguity with yellowish pollinosity ( Figs 1C View FIGURE 1 , 3I, J View FIGURE 3 ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1C View FIGURE 1 ). Thorax entirely black ( Fig. 3F View FIGURE 3 ); scutum subshiny black with appressed short yellow pile, but posterior half sparsely with longer erect brown pile mixed with shrort pile; anterior anepisternum covered with yellowish pollinosity; posterior anepisternum with whitish yellow pile but without pollinosity; anepimeron covered with yellow pile; katepisternum moderately covered with yellowish white pollinosity, dorsal posterior area with yellowish pile; notopleuron with yellow pile; scutal area anterior to wing base with black pile; postalar callus with mainly long yellow pile but anterior small area with few black pile; metasternum bare with yellowish pollinosity. Wing hyaline except for pale brownish pterostigma ( Fig. 3F View FIGURE 3 ); halter pale yellow. Legs: femora black; pro- and mesotibiae pale brownish yellow with subapico-ventral 3/5 brownish black; pro- and mesotarsomere 1–3 pale brownish yellow; pro- and mesotaromeres 4 and 5 dark brown; metatrochanter ventrally with short calcar (subequal to basal width) ( Fig. 3G View FIGURE 3 ); apico-ventral 1/3 of metafemur with two carinae covered with short and stout setae, remaining basal ventral area with irregularly scattered less stout spinose setae mixed with smaller setae, antero-dorsally and postero-ventrally with long white pile, apico-dorsal 1/3 area with short black pile; basal 1/3 of metatibia yellow ( Fig. 3G View FIGURE 3 ); metatarsomeres 1–3 dark brown and metatarsomeres 4 and 5 black ( Fig. 3G View FIGURE 3 ). Abdomen about 3x longer than wide, terga 2 and 3 more or less parallel-sided ( Figs 2C View FIGURE 2 , 3F View FIGURE 3 ), each with a pair of inner facing triangular areas densely covered with long yellow pile (2– 3x longer than pile on nearby areas, other areas of terga 2 and 3 covered with appressed short black pile) ( Fig. 2C View FIGURE 2 ); tergum 4 densely covered with long yellow pile ( Fig. 3F View FIGURE 3 ). Male genitalia ( Figs 8 View FIGURE 8 E–H, 13B): surstylus with dorsal lobe about twice as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with spinose setulae ( Fig. 8E, F View FIGURE 8 ); ventral lobe of surstylus blunt but distinctly projected with apex setulose ( Fig. 8E, F View FIGURE 8 ); cercus cordated in profile with long pale pile ( Fig. 8E, F View FIGURE 8 ); lingula indistinct ( Fig. 13B View FIGURE 13 ); fenestra relatively large and subtriangular in outline ( Fig. 8E, F View FIGURE 8 ); spur of superior lobe reduced ( Fig. 13B View FIGURE 13 ); superior lobes asymmetrical ( Fig. 8E, F View FIGURE 8 ); right lateral arm of theca with two long dorsal thorny processes with 3–5 pale pile in between these two processes, also with blund cocks comb shaped apico-ventral process ( Fig. 8E View FIGURE 8 ); left lateral arm of theca with similar thorns and pile but apico-ventral process much shorter ( Fig. 8F View FIGURE 8 ); aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round ( Fig. 8G View FIGURE 8 ); ejaculatory process short ( Fig. 8G View FIGURE 8 ); ejaculatory apodeme apically enlarged and bowl shaped.

FEMALE. Unknown.

Material examined. SOUTH KOREA: Gangwon-do : 1♂, Inje-gun , Sangnam-myeon , Bangdong-ri , Mt. Bang- taesan North valley of Guryongduckbong, 6.VII.2000, HY Han et al .

Distribution. Korea (new record), Northeast China (Dong bei)

Remarks. The only available male specimen from Korea agrees fairly well with the genitalic illustrations and description by Yang & Cheng (1998), and Huang & Cheng (2012). Xylota sibirica Loew, 1871 appears to be closely related with X. amaculata by sharing almost identical male genitalia. When comparing with Hippa’s (1978) male genitalic illustration of X. sibirica , the right lateral arms of theca is apico-ventrally sharply pointed in this species, but blunt in X. amaculata ( Fig. 8E View FIGURE 8 ).