Stichillus species
Creators: name: Lee, Jun-Ho
name: Kim, Sam-Kyu
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy

description: A key to males of ten Stichillus species from East Asia
(except Mongolia and North Korea, modified after Liu & Chou 1996; Liu 2001; Nakayama & Shima 2004)
1. Hind tibia with two dorsal longitudinal setal palisades; ventral membrane of aedeagus kidney-shaped (see Liu 2001: 194, figs. 84, 85)......................................................................... S. tuberculosus Liu & Chou
- Hind tibia with three dorsal longitudinal setal palisades (Fig. 4A); ventral membrane of aedeagus not as above........... 2
2. Anterior and middle dorsal setal palisades of hind tibia fused apically (Fig. 4D); dorsal plate of aedeagus without any strong pointed process at basal portion (Fig. 9D).................................................................. 3
- Anterior and middle dorsal setal palisades of hind tibia not fused apically (hind tibia with three setal palisades along its whole length) (Fig. 4A); dorsal plate of aedeagus with strong pointed process on dorsal or right side of basal portion (Figs. 7E)... 7
3. Middle arc of ocellar region distinctly larger than lateral arc; anterior and middle dorsal setal palisades of hind tibia fused at apical 1/5 or 1/4; dorsal plate of aedeagus nearly straight (see Liu 2001: 191, figs. 68, 76)............................ 4
- Middle arc of ocellar region not distinctly larger than lateral arc; anterior and middle dorsal setal palisades of hind tibia fused at apical half (Fig. 4D); dorsal plate of aedeagus curved upward (Fig. 9D)........................................ 5
4. Middle arc of ocellar region greatly extended anteriorly; anterior and middle dorsal setal palisades of hind tibia fused at apical 1/5; epandrial lobe covered with short hairs (see Liu 2001: 191, figs. 68, 76)....................... S. suspectus (Brues)
- Middle arc of ocellar region not distinctly extended anteriorly; anterior and middle dorsal setal palisades of hind tibia fused at apical 1/4; epandrial lobe covered with long hairs (see Liu 2001: 193, figs. 75, 80)........... S. polychaetous Liu & Chou
5. Space between arcs of three-looped ocellar region wide (Fig. 2F; see Liu 2001: 191, fig. 69)........... S. sinuosus Schmitz Space between arcs of three-looped ocellar region narrow (Fig. 2H)............................................. 6
6. Dorsal plate of aedeagus without well-developed dorsobasal ridge; with numerous minute spinules on right surface of apical portion; without short pointed process apically (Fig. 9E).................................... S. spinosus Liu & Chou
- Dorsal plate of aedeagus with well-developed dorsobasal ridge; without numerous minute spinules on right surface of apical portion; with short pointed process apically (see Liu 2001: 194, figs. 86, 87).................. S. orbiculatus Liu & Chou
7. Tip of inner projection on posterior margin of hypandrium situated below bottom level of lateral membranous lobe of hypandrium (Fig. 6B); dorsal plate of aedeagus without pointed dorsal process, with hooked apex (Fig. 6D)................................................................................................ S. cylindratus Nakayama & Shima
- Tip of inner projection on posterior margin of hypandrium situated above bottom level of lateral membranous lobe of hypandrium (Fig. 7B); dorsal plate of aedeagus with pointed dorsal process, apex not hooked (Fig. 7D)........................... 8
8. Epandrial lobe not greatly enlarged apically (Fig. 7A); tip of inner projection on posterior margin of hypandrium long (Fig. 7B); dorsal plate of aedeagus with single robust arm curved forming obtuse-angle on right side of basal portion (Fig. 7E)....................................................................................... S. japonicus (Matsumura)
- Epandrial lobe enlarged apically (Fig. 8A); tip of inner projection on posterior margin of hypandrium short (Fig. 8B); dorsal plate of aedeagus with or without single robust arm on right side of basal portion (presence of robust arm uncertain in S. acuminatus); if present, slightly curved, not forming distinct obtuse-angle (Fig. 8E)................................. 9
9. First flagellomere of antenna orange red; posterodorsal margin of epandrial lobe nearly straight; dorsal plate of aedeagus curved with angle less than 90°, with apex pointed (see Liu 2001: 192, figs. 78, 79)................... S. acuminatus Liu & Chou
- First flagellomere of antenna dark reddish brown (Fig. 1E); posterodorsal margin of epandrial lobe rounded (Fig. 8A); dorsal plate of aedeagus curved with angle more than 90°, with apex blunt (Fig. 8D)...................... S. koreanus sp. nov.
description: Published as part of Lee, Jun-Ho & Kim, Sam-Kyu, 2023, A taxonomic study on the genus Stichillus (Diptera: Phoridae) from South Korea, with a key to species from East Asia, pp. 381-398 in Zootaxa 5352 (3) on pages 396-397, DOI: 10.11646/zootaxa.5352.3.3, http://zenodo.org/record/8407390