Xylota orientiflorum, 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 : 474-476

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/5A219B24-3455-472B-FCED-F9589CDF174D
treatment provided by	Plazi
scientific name	Xylota orientiflorum
status	sp. nov.

Treatment

Xylota orientiflorum View in CoL sp. n.

(Korean name: dong-yang-kkot-heo-ri-kkot-deung-e)

Figs 1Q View FIGURE 1 , 2Q View FIGURE 2 , 5 View FIGURE 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 View FIGURE 1 ); and 4) scutal area anterior to wing base with black pile. See also Diagnosis of X. abiens .

Description. MALE. Body length 12.3–13.8mm; wing length 8.5–9.0mm. Head black; face with dense white pollinosity ( Fig. 5R, S View FIGURE 5 ); posterior 1/3 of frons anterior to eye contiguity with yellowish white pollinosity ( Figs 1Q View FIGURE 1 , 5R, S View FIGURE 5 ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) covered with yellowish pile ( Fig. 1Q View FIGURE 1 ). 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 View FIGURE 5 ), 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 View FIGURE 5 ); 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 View FIGURE 5 ). Abdomen about 3.5x longer than wide ( Figs 2Q View FIGURE 2 , 5O View FIGURE 5 ), almost parallel-sided but slightly broaden medially, with posteriorly widened tergum 2 ( Figs 2Q View FIGURE 2 , 5O View FIGURE 5 ); 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 View FIGURE 2 , 5O View FIGURE 5 ); tergum 3 with pair of larger subrectangular maculae, separated from each other by about 1/3 width of each macula ( Figs 2Q View FIGURE 2 , 5O View FIGURE 5 ). Male genitalia ( Figs 11 View FIGURE 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 View FIGURE 11 A–C); ventral lobe of surstylus bulged widely with apex setulose, ( Fig. 11 View FIGURE 11 A–C); cercus cordated in profile with long pale pile ( Fig. 11 View FIGURE 11 A–C); lingula indistinct ( Fig. 13F View FIGURE 13 ); fenestra round in outline ( Fig. 11 View FIGURE 11 A–C); spur of superior lobe reduced ( Fig. 13F View FIGURE 13 ); superior lobes asymmetric( Fig. 11 View FIGURE 11 A–C); right lateral arm of theca ( Fig. 11C View FIGURE 11 ) 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 View FIGURE 11 ) apico-dorsally round and ventrally three denticles; aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round ( Fig. 11D View FIGURE 11 ); ejaculatory process short ( Fig. 11D View FIGURE 11 ); 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) GoogleMaps . PARATYPES. 1♂, South Korea, Jeollanam-do, Gwang- yang-si, Ongnyong-myeon, Mt. Baegunsan from jinteul, N35°6‘23“ E127°37‘17“, 23. VI GoogleMaps .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) GoogleMaps .

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 View FIGURE 2 , 5O View FIGURE 5 ). Its male genitalic characteristics (especially the large ventrally hooked process on apex of right leteral arm of theca; Fig. 11C View FIGURE 11 ) 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) .