Xylota pseudoignava Mutin 1984
Creators: name: Jeong, Soo-Hyun
name: Han, Ho-Yeon
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Xylota
Xylota pseudoignava

description: Xylota pseudoignava Mutin
(Korean name: teol-bo-heo-ri-kkot-deung-e)
Figs 1I, J, 2I, J, 6 A–E, 11E–H, 13J
Species new to Korea
Xylota pseudoignava Mutin, 1984: 783 (type locality: Russia. Khabarovsk krai, environs of Pivan Village; holotype ♂, ZISP); Mutin & Barkalov, 1999: 496, 498 (in Russian Far East key); Mutin & Gilbert, 1999: 52 (illustration and diagnosis).
Xylota crepera: He & Chu, 1992: 3 (type locality: Heilongjiang, Ningan; holotype ♂, SAC); Mutin & Gilbert, 1999: 52 (new synonym of X. pseudoignava).
Diagnosis. Xylota pseudoignava is similar to X. xanthotarsis sp. n., especially by sharing the silvery pilose patched abdomen (Fig. 2I, J), while other similar dark colored Korean species have yellowish or white pilose abdominal patches. The former species can be further distinguished from the latter by the following combination of characters: 1) metatarsus dark brown (Fig. 6C, D) vs. pale yellow (Fig. 7L, M); and 2) postalar callus of scutum with dense black pile vs. sparse or no such black pile. Male genitalic structures of these species are also closely resembling each other but X. pseudoignava has the hypandrium ventrally with a strong hump (Figs 11F, G, 13J) but X. xanthotarsis sp. n. only with a weak hump (Figs 12J, K, 13I).
Description of Korean material. Male. Body length 12.9mm; wing length 9.1mm. Black with silvery white abdominal pollinose patched species. Head black (Fig. 6 F–I); face with dense yellow pollinosity without bare part; posterior 1/3 of frons anterior to eye contiguity with yellowish pollinosity (Fig. 1I); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile (Fig. 1I). Thorax entirely black (Fig. 6A); scutum subshiny black with appressed short yellow pile, but posterior half sparsely with longer erect yellow pile mixed with short pile; anterior anepisternum covered with yellowish pollinosity; posterior anepisternum with dense yellow pile and yellowish pollinosity; anepimeron covered with yellow pile; katepisternum moderately covered with whitish yellow pollinosity, upper posterior area with whitish yellow pile; anepimeron covered with yellow pile; katepisternum moderately covered with whitish yellow pollinosity, dorsal posterior area with whitish yellow pile; notopleuron with yellow pile; scutal area anterior to wing base with black and few yellow pile mixed; postalar callus mainly with black pile and posterior with some yellow pile; metasternum bare with yellow pollinosity. Wing with pale brownish tinge on cell r 2+3 of wing, pterostigma brown; halter with basal half of stem dark brown but posterior stem and knob yellow. Legs: femora almost entirely black; pro- and mesotibiae yellow and subapico-ventral 2/3 dark brown to black; pro- and mesotarsomeres 1 and 2 yellow, tarsomeres 3–5 black; metatrochanter ventrally with elongated and sharp calcar (at least twice as long as basal width) (Fig. 6C); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with two irregular rows of spinose setae except for basal 1/5 (anterior row covers whole length but posterior row reaches 2/3 length), anterodorsally and postero-ventrally with long yellowish pile, apico-dorsal 1/3 area with short and black pile; metatibia dark brown to black and basal 1/3 yellowish brown; metatarsus dark brown to black (Fig. 6C). Abdomen about 4x longer than wide (Figs 2I, J, 6A, B), terga 2 and 3 almost parallel-sided (Figs 2I, 6A); terga 2–4 with pair of lateral facing triangular areas densely covered with white pollinosity and white erect pile (other areas of terga with short appressed black pile) (Fig. 2I). Male genitalia (Figs 11 E–H, 13J): 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 spinose setulae (Figs 11 E–G); ventral lobe of surstylus blunt but distinctly projected with apex setulose (Fig. 11 E–G); cercus cordated in profile with long pale pile (Fig. 11 E–G); lingula with distinct margin (Fig. 13J); fenestra transversely elliptic in outline (Fig. 11 E–G); spur of superior lobe reduced; superior lobes almost symmetrical (Fig. 11F, G); lateral arms of theca about apical half with sparsely scattered spiny setulae, dorsally rounded, apico-ventrally with short tiny protrusion; lateral arms of theca and hypandrium ventrally separated by deep invagination (Fig. 11F, G); hypandrium ventrally also with strong hump (Fig. 11F, G); aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round; ejaculatory process short (Fig. 11H); ejaculatory apodeme apically enlarged and bowl shaped.
FEMALE. Similar to male except for the following non-genitalic characters: Head (Fig. 1J): frons with about anterior 1/3 shiny black and bare with posterior 2/3 shiny black and covered with yellowish pile, medially with pair of areas of white polinosity, except for 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. 6D): metatrochanter without calcar. Abdomen (Fig. 2J): terga 2 and 3 medially slightly widen.
Material examined. SOUTH KOREA: Gangwon-do: 1♂, Hongcheon-gun, Nae-myeon, Changchon-ri, North valley of Mt. Gyebangsan, Unduryeong, 12.VIII.2008, SW Suk et al.; 2♂, Pyeongchang-gun, Yongpyeon-myeon, Nodong-ri, Nodong Valley 900m, N37°42’08” E128°28’86”, Malaise trap in forest in shade, Tripotin rec., 23.VI.– 3.VIII.2006, M. Hauser; 1♀, Samcheok, Dogye-eup, Dogye-ri, from Amisa Temple to Dusugol, 7. VI.2003, DS Choi et al.
Distribution. Korea (new record), Russia (Southern Siberia, Russian Far East)
Remarks. The Korean specimens of this species agree well with the description and genitalic illustration by Mutin & Gilbert (1999).
description: Published as part of Jeong, Soo-Hyun & Han, Ho-Yeon, 2019, A taxonomic revision of the genus Xylota Meigen (Diptera: Syrphidae) in Korea, pp. 457-493 in Zootaxa 4661 (3) on pages 476-477, DOI: 10.11646/zootaxa.4661.3.3, http://zenodo.org/record/3446340