Xylota tarda Meigen, 1822

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 : 479-481

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/5A219B24-3452-4720-FCED-FD6C9F541062
treatment provided by	Plazi
scientific name	Xylota tarda Meigen
status

Treatment

Xylota tarda Meigen View in CoL

(Korean name: bae-mu-nui-heo-ri-kkot-deung-e)

Figs 1R, S View FIGURE 1 , 2R, S View FIGURE 2 , 6 View FIGURE 6 O–W, 12A–D, 13H

Species new to Korea

Xylota tarda Meigen, 1822: 225 View in CoL (type locality: Austria; type ♀, NMW); Hippa, 1968: 189 (taxonomic discussion and illustra- tion); Hippa, 1978: 64 (taxonomic discussion); Violovitsh, 1986: 140 (in Siberian key); Mutin & Barkalov, 1999: 492, 497 (in Russian Far East key with illustration); Speight, 1999: 216, 217 (in European key); Vujić & Milankov, 1999: 124, 126 (in key of Balkan peninsula); Stubbs & Falk, 2002:336, 440 (color illustration); Bartsch et al., 2009: 416 (color illustration and diagnosis).

Xylota arboris He & Chu, 1992:5 (type locality: Heilongjiang, Ningan; holotype ♂, SAC); Mutin & Gilbert 1999: 53 (new synonym of X. tarda View in CoL ); Huang & Cheng, 2012: 681 (diagnosis with illustration).

Diagnosis. This species can be readily distinguished from the other Korean Xylota species by the following characters: 1) terga 2 and 3 each with a pair of large orange-yellow maculae almost touching each other ( Figs 2R, S View FIGURE 2 , 6O, P View FIGURE 6 ); 2) the area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle in male and small area immediately anterior to ocellar triangle in female) bare ( Fig. 1R, S View FIGURE 1 ); 3) scutal area anterior to wing base with yellow pile; and 4) anterior 2/3 of anterior anepisternum bare. See Diagnosis of X. abiens .

Description of Korean material. MALE. Body length 9.3mm; wing length 6.62mm; dark brown to black species with pale orange-yellow abdominal maculae. Head black ( Fig. 6T, U View FIGURE 6 ); face with dense yellow pollinosity; posterior half of frons anterior to eye contiguity with yellowish pollinosity ( Figs 1R View FIGURE 1 , 6T, U View FIGURE 6 ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1R View FIGURE 1 ). Thorax entirely black; scutum subshiny black, covered with short appressed yellow pile; anterior 2/3 of anterior anepisternum bare and posterior 1/3 covered with yellowish pollinosity; posterior anepisternum with yellowish pollinosity and white pile (upper 1/2 mixed with yellowish pile); anepimeron covered with white pile; katepisternum moderately covered with white pollinosity, dorsal posterior area with white pile; notopleuron with yellow pile; scutal area anterior to wing base with yellow with few black pile mixed; postalar callus with yellow pile; metasternum almost bare with white pollinosity. Wing entirely with pale brownish tinge, pterostigma pale brown ( Fig. 6O View FIGURE 6 ); halter with basal 1/3 of stem dark brown but posterior stem and knob yellow. Legs: femora almost entirely dark brown to black; pro- and mesotibiae yellow and subapico-ventral 3/5 dark brown; pro- and mesotarsomeres 1–3 yellow, tarsomeres 4 and 5 brown; metatrochanter ventrally with short calcar (subequal to basal width) ( Fig. 6Q View FIGURE 6 ); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with irregular smaller spinose setae except for basal 1/5, antero-dorsally and postero-ventrally with long whitish yellow pile, apico-dorsal 1/3 area with short and dark brown pile; metatibia dark brown and basal 1/3 yellowish brown; metatarsomeres 1 and 2 dorsally dark brown and apico-ventrally brownish yellow ( Fig. 6Q View FIGURE 6 ); tarsomere 3 dorsally dark brown and ventrally brownish yellow; tarsomere 4 and 5 black ( Fig. 6Q, R View FIGURE 6 ). Abdomen about 3.5x longer than wide ( Figs 2R View FIGURE 2 , 6O View FIGURE 6 ), terga 2 and 3 almost parallel-sided but with slightly widened posterior ( Figs 2R View FIGURE 2 , 6O View FIGURE 6 ); preabdominal terga dark brown in ground color; tergum 2 with pair of large reddish yellow maculae covering almost 60–80% of tergum with their posterior half almost touching each other and anterior half cut away as inverted triangular shape; tergum 3 with pair of square reddish yellow maculae covering about anterior half of tergum, almost touching each other. Male genitalia ( Figs 12 View FIGURE 12 A–D, 13H): surstylus with dorsal lobe, elongated about 1.5x as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with spinose setulae ( Fig. 12 View FIGURE 12 A–C); ventral lobe of surstylus blunt but distinctly projected with apex setulose ( Fig. 12B, C View FIGURE 12 ); cercus cordated in profile with long pale pile ( Fig. 12 View FIGURE 12 A–C); lingula indistinct ( Fig. 13H View FIGURE 13 ); fenestra small and elongated elliptic ( Fig. 12B, C View FIGURE 12 ); spur of superior lobe reduced ( Fig. 13H View FIGURE 13 ); superior lobes almost symetrical ( Fig. 12B, C View FIGURE 12 ); lateral arms of theca elongated and crooked down with blunt apex, apico-dorsally round and bulged with small spinose pile, dorsally with few denticles in varying size ( Fig. 12B View FIGURE 12 ); aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round; ejaculatory process short ( Fig. 13H View FIGURE 13 ); ejaculatory apodeme apically enlarged and bowl shaped.

FEMALE. Similar to male except for the following non-genitalic characters: Head ( Fig. 1S View FIGURE 1 ): frons with about anterior 1/3 shiny black and bare with posterior 2/3 shiny black and covered with whitish yellowish pile, medially with pair of areas of yellowish pollinosity except for medially narrow longitudinal bare area; area anterior to ocellar triangle (small area immediately anterior to ocellar triangle) bare but posterior area covered with yellow pile. Leg ( Fig. 6R View FIGURE 6 ): metatrochanter without calcar. Abdomen ( Fig. 6P View FIGURE 6 ): terga 2 and 3 posteriorly widen.

Material examined. SOUTH KOREA: Gangwon-do: 1♂, Samcheok-si , Hajang-myeon, Mt. Jungbongsan N37°26’19” E128°55’34”, 8.IX.2008, YB Lee et al GoogleMaps .; 1♀, Hongcheon-gun , Nae-myeon , Changchon-ri , North valley of Mt. Gyebangsan, 14.VIII.2009, JM Jung and YB Lee .

Distribution. Korea (new record), Russia (From Altay to Kuril Isles), widely distributed in whole Europe.

Remarks. The genitalic structures of the Korean male ( Figs 12C View FIGURE 12 ) agree with the illustration of Hippa (1968) as well as the illustrations and description by Stubbs & Falk (2002) and Bartsch et al. (2009). Xylota tarda seems to be closely related to X. filipjevi (see Remarks for the latter species).