Ypsiloncyphon
Creators: name: Zwick, Peter
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scirtidae
Ypsiloncyphon

description: Key to males of species group 3 of Ypsiloncyphon
1 Parameroids with curved subterminal appendage (Fig. 60)....................................... Y. virgulifer, n. sp.
1' Parameroids without appendage.......................................................................... 2
2 Head and pronotum bright red, rest of body dark brown......................................... Y. ruficollis, n. sp.
2' Dorsal side dark brown to black, at most head reddish......................................................... 3
3 Outer face of parameroids covered with small hard teeth, rough (Fig. 73). S9 composed of a pair of similar, thin, pointed scler- ite rods (Fig. 72)......................................................................... Y. rugosus, n. sp.
3' Parameroids with smooth surface. S9 pronouncedly asymmetrical, caudal parts blade-like............................ 4
4 Pala several times longer than the short capulus of S9. S9 about 50% longer than the penis (Figs. 77, 79).... Y. longus, n. sp.
4' Capulus and pala of similar length (e.g., Figs. 64, 66, 103, 104). Penis never so much shorter than S9................... 5
5 Parameroids pointed, ending in a thin flagellum. Parameroids about 1/3 longer than the trigonium (Fig. 86) Y. mutilatus, n. sp.
5' Parameroids a little (ca. 10–15%) longer than the trigonium, their apices blunt..................................... 6
6 Pala long, forming a long rod-like base to the variable trigonium (e.g., Fig. 93, 101)................................. 7
6' Pala waisted, constricted portion short, not a long narrow stalk (Figs 118, 123). Trigonium not waisted, gradually narrowing to tip................................................................................................. 10
7 Short blade of S9 apically abruptly narrowed, narrow portion a little longer than maximum width of blade (e.g., Figs 94, 102).................................................................................................... 8
7' Short blade of S9 gradually drawn out into a narrow apical portion which is two or more times longer than maximum width of blade (e.g., Figs. 103, 115).............................................................................. 9
8 Parameroids apically wide, enclosing the trigonium between them, veiling it partly. Trigonium waisted, narrowest point of similar width as pala at its narrowest point (Figs. 93, 95, 97)....................................... Y. velatus, n. sp.
8' Parameroids slender, trigonium exposed, its narrowest point only about half as wide as narrowest point of pala (Fig. 101).......................................................................................... Y. pusillus, n. sp.
9 Trigonium distinctly waisted, the apex wide, bluntly rounded, with small median nipple. Parameroids are sinuous rods. Narrow apical portion of both blades of S9 curved (Figs. 103, 104)...................................... Y. katherinae, n. sp.
9' Trigonium conical, continuously narrowed to tip, not constricted (Fig. 114). Parameroids are slender plates. Blades of S9 drawn out into long straight apices (Figs. 111, 115)......................................... Y. micans (Klausnitzer)
10 Penis short, stout, straight, trigonium about 4–5 times longer than maximum width, its tip widely separate from the param- eroids (Fig. 118)........................................................................... Y. brevis, n. sp.
10' Penis long and slender, trigonium up to 7 times longer than maximum width, trigonium and parameroid tips close together, trigonium tip often bent back (Figs. 122, 123)................................................. Y. angustus, n. sp.
description: Published as part of Zwick, Peter, 2014, Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer, pp. 1-41 in Zootaxa 3846 (1) on page 19, DOI: 10.11646/zootaxa.3846.1.1, http://zenodo.org/record/286792