Xylota ignava (Panzer), 2014

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 : 473-474

Xylota ignava (Panzer)

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

Figs 1T, U , 2T, U , 5 F–N, 10I–L, 13K

Syrphus ignava Panzer, 1798: 4 (type locality: Germany. Nürnberg; depository unknown)

Musca pigra Schrank, 1803: 114 (type locality: Germany, near Gern and Ingolstadt; depository unknown)

Xylota basalis Matsumura, 1911: 74 (type locality: Russian Far East, Sakhalin, Kusunnai, Solowiyofka; holotype ♀, NIAES); Matsumura & Adachi 1916: 248 (redescription).

Xylota inermis Becker, 1921: 86 (type locality: Russia, Transbaikal, Tachita; holotype ♂, ZMHU)

Zelima ignava: Sack, 1932: 373 (in Palaearctic Key, description); Matsumura, 1931: 359 (redescription); Doi, 1938: 11 (in Korean checklist); ZSK, 1968: 180 (in Korean checklist); Kim C.W. et al., 1971a: 873 (redescription); Kim J.I., 1975: 41 (in Korean checklist).

Xylota ignava: Hippa, 1968: 189 (taxonomic discussion); Hippa, 1978: 8, 38, 54, 62, 64, 68, 77 (taxonomic discussion); Kim J.I., 1980: 386 (in Korean checklist); Violovitsh, 1983:140 (in Siberia Key); Peck, 1988: 225 (in Palearctic catalog,_indicate Korean distribution); He & Chu, 1992: 2; ESK & KSAE, 1994:291 (in Korean checklist); Huang et al., 1996: 212 (Chinese catalog); Han et al., 1998: 153 (Korean catalog); Mutin & Barkalov, 1999: 492 (in species key indicate Korean distr.); Speight, 1999: 216 (in European key); Vujić & Milankov, 1999: 124, 126 (in key of Balkan peninsula); Han & Choi, 2001: 184 (Family syrphidae ); Bartsch et al., 2009: 409 (color illustration and diagnosis); Paek et al., 2010: 232 (in Korean checklist); Huang & Cheng, 2012: 674 (illustration and diagnosis); Han et al., 2014: 30 (in Korean catalog); Ohara et al., 2014: 523 (in Japanese catalog).

Diagnosis. This species can be readily distinguished from the other Korean Xylota species by orange coloration on the abdominal terga 2 and 3 ( Figs 2T, U , 5F, G ) and strongly curved apico-ventral ridge of metafemur.

Description of Korean material. MALE. Body length: 11.6–12.5mm; wing length: 9–10mm. Head black; face with dense yellow pollinosity; frons anterior to eye contiguity with dense yellow pollinosity ( Fig. 1T ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1T ). 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 white pollinosity; posterior anepisternum with whitish yellow pile and white pollinosity; anepimeron covered with white pile; katepisternum moderately covered with white pollinosity, dorsal posterior area with white pile; notopleuron with yellowish white pile; scutal area anterior to wing base with black pile; postalar callus with mainly long yellow pile but anterior small portion with few black pile; metasternum bare with white pollinosity. Wing pale brownish tinge roughly confined to anterior-apical area and with pterostigma pale brown; halter pale yellow. Legs: femora almost entirely black except for short apical pale brownish yellow area; pro- and mesotibiae brownish yellow; pro- and mesotarsomeres 1–3 brownish yellow; tarsomeres 4 and 5 dark brown; metatrochanter ventrally with elongated and sharp brownish yellow calcar (at least twice as long as basal width) ( Fig. 5H ); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with irregularly scattered smaller setae except for basal 1/5, antero-dorsally and postero-ventrally with long white pile, apico-dorsal 1/3 area with black setulae; metatibia brownish yellow with medio-ventral 1/3 dark brown to black ( Fig. 5H ); metataromeres 1–3 brownish yellow, tarsomeres 4 and 5 black ( Fig. 5H ). Abdomen about 3x longer than wide ( Figs 2T , 5F ), terga 2 and 3 almost parallel-sided in male ( Figs 2T , 5F ); tergum 2 entirely with orange fascia and tergum 3 apical half with such fascia ( Figs 2T, U , 5F, G ); terga 1 and 4 black ( Figs 2T , 5F ). Male genitalia ( Figs 10 I–L, 13K): surstylus with dorsal lobe 2.5x as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with spinose setulae ( Fig. 10 I–K); ventral lobe widely bulged, apically covered with spinose setulae ( Fig. 10 I–K); cercus cordated in profile with long pale pile ( Fig. 10 I–K); lingula indistinct ( Fig. 13K ); fenestra relatively large and transversely elliptic in outline ( Fig. 10J, K ); spur of superior lobe reduced ( Fig. 13K ); superior lobe almost symmetrical ( Fig. 10J, K ); lateral arms of theca apico-dosally round, with dark funnel-shaped apico-ventral process ( Fig. 10J, K ); aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round ( Fig. 10L ); ejaculatory process short; ejaculatory apodeme narrow ( Fig. 10L ).

FEMALE. Similar to male except for the following non-genitalic characters: Head ( Fig. 1U ): frons with about anterior 1/3 shiny black and bare, posterior 2/3 shiny black, covered with yellow pile, medially with transvers yellowish pollinose area; area anterior to ocellar triangle (small area immediately anterior to ocellar triangle) bare but posterior area covered with yellow pile. Leg ( Fig. 5I ): metatrochanter without calcar; femora almost entirely black except for short apical reddish yellow area; pro- and mesotibiae reddish yellow; pro- and mesotarsomeres 1–3 reddish yellow; tarsomeres 4 and 5 dark brown; metatrochanter without calcar. Abdomen ( Fig. 2U ): tergum 2 posteriorly slightly widened.

Material examined. MONGOLIA: 1♂, TOV: S. border of Terelji National Park N47°48’39” E107°22’13”, 6.VIII.2009, HY Han and SW Suk . 1♀, Khentii, Binder Canpsite 1037m, N48°34’57” E110°39’50”, 30.VII.2014, H.Y. Han et al .

Distribution. Korea, Japan, Northeast China, Mongolia, Russia, Europe.

Remarks. For Korean fauna, this species was recorded only from North Korea (Hoeryeong, Namsulryung, Bukgyesu) by Doi (1938). We, therefore, used Mongolian specimens for the description and photography.

Figures

FIGURE 1. Schematic drawings showing head pilosity and pollinosity in Xylota species, dorsal view (A, B) Xylota umbrosa; (C) X. amaculata; (D) X. filipjevi; (E) X. atricoloris; (F) X. hauseri sp. n.; (G, H) X. xanthotarsis sp. n.; (I, J) X. pseudiognava; (K, L) X. coquilletti; (M) X. spurivulgaris; (N) either X. spurivulgaris or X. fo; (O) X. fo; (P) X. abiens; (Q) X. orientiflorum sp. n.; (R, S) X. tarda; (T, U) X. ignava. Areas of pollinosity shown by darkened areas are actually silvery white to yellowish white.

FIGURE 2. Pattern of abdominal terga in Xylota species, dorsal view (A, B) X. umbrosa; (C) X. amaculata; (D) X. filipjevi; (E) X. atricoloris; (F) X. hauseri sp. n.; (G, H) X. xanthotarsis sp. n.; (I, J) X. pseudiognava; (K, L) X. coquilletti; (M) X. spurivulgaris; (N) either X. spurivulgaris or X. fo; (O) X. fo; (P) X. abiens; (Q) X. orientiflorum sp. n.; (R, S) X. tarda; (T, U) X. ignava. (A–O) Grainy areas represent same colored patterns that can be distinguished by having differently oriented and (or) colored pile. These patterns can be best viewed by turning a specimen under a microscope. (P–U) Lighter areas represent lighter colored patterns.

FIGURE 5. Leg, head and body of Xylota species. A–E. X. hauseri sp. n.: (A dorsal view, C lateral view) male body; (B) male left metafemur, anterior view; (D dorsal view, E antero-lateral view) male head. 5F–N. X. ignava: (F, J) male body; (G) female body; (H) male left metafemur, anterior view; (I) female left metafemur, anterior view; (K, L) male head; (M, N) female head. 5O–S. X. orientiflorum sp. n.: (O, Q) male body; (P) male left metafemur, anterior view; (R, S) male head.

FIGURE 10. Male genitalia of Xylota species, A, E, I dorsal view, B, F, J left lateral view, C, G, K right lateral view, D, H, L aedeagus lateral view: (A–D) Xylota fo; (E–H) X. hauseri sp. n.; (I–L) X. ignava. Scale bar: 0.5mm. Enlargement showing apical part of superior lobe (lateral arms of theca).

FIGURE 13. Male genitalia of Xylota species, ventral view with aedeagus removed. (A) Xylota umbrosa; (B) X. amaculata; (C) X. atricoloris; (D) X. hauseri sp. n.; (E) X. abiens; (F) X. orientiflorum sp. n.; (G) X. filipjevi; (H) X. tarda; (I) X. xanthotarsis sp. n.; (J) X. pseudoignava; (K) X. ignava; (L) X. coquilletti; (M) X. spurivulgaris; (N) X. fo. The pictures are arbitrarily arranged based on three morphological groups (A–H; I–K; L–N). Scale bar: 0.5mm.