A taxonomic revision of the genus Xylota Meigen (Diptera: Syrphidae) in Korea
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 4. Leg, head and body of Xylota species. A–I. X. coquilletti: (A dorsal view, E antero-lateral view) male body; (B) female body; (C) male left metafemur, anterior view with enlargement of metatibia in ventral view; (D) female left metafemur, antero-ventral view; (F, G) male head; (H, I) female head. 4J–N. X. filipjevi: (J, L) male body; (K) male left metafemur, anterior view; (M, N) male head. 4O–W. X. fo: (O) male body; (*P) female body; (Q) male left metafemur, anterior view; (*R) female left metafemur, anterior view; (T, U) male head; (*V, *W) female head. *Since the females of X. fo and X. spurivulgaris are not distinguishable, they could belong to any of these two species.
FIGURE 6. Leg, head and body of Xylota speices. A–E. X. pseudoignava: (A dorsal view, E lateral view) male body; (B) female body; (C) male left metafemur, anterior view; (D) female left metafemur, anterior view; (F dorsal view, G antero-lateral view) male head; (H, I) female head. 6J–N. X. spurivulgaris: (J, L) male body; (K) male left metafemur anterior view; (M, N) male head; see Fig, 4 for presumed female photos. 6O–W. X. tarda: (O, S) male body; (P) female body; (Q) male left metafemur, anterior view; (R) female left metafemur, anterior view; (T, U) male head; (V, W) female 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.