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

description: Key to females of species group 3 of Ypsiloncyphon
(females of Y. pusillus, Y. rugosus, Y. velatus, and Y. virgulifer unknown)
1 Apodemes of S8 anteriorly fused, forming a single median sclerite (e.g., Figs. 68, 88, 106)........................... 2
1' Apodemes of S8 connected in front to form an open frame of various forms (e.g., Figs. 116, 119, 124).................. 7
2 Unpaired apodeme of S8 wide, a slender triangular sclerite caudally drawn out into the lateral rods, anteriorly with a middorsal tooth (Fig. 127).................................................................................. Y. sp. A
2' Sclerites of S8 resembling a tuning fork, the unpaired apodeme is a slender rod without tooth......................... 3
3 T7 with two paramedian notches (Fig. 107). Vulvar sclerite box-shaped, dictyon composed of few large meshes (Figs. 108, 109)................................................................................ Y. katherinae, n. sp.
3' T7 without notches. S7 with median nipple which is folded forward, not visible from outside. Vulvar sclerite widening posteri- orly, a dorsally widely open tube ending in two spreading caudolateral lobes (e.g., Figs. 82, 89); dictyon large, composed of many meshes (e.g., Fig. 83)............................................................................. 4
4 Unpaired portion of apodemes of S8 short, less than half as long as the paired branches (Fig. 129). Conspicuous scales cau- dolaterally on vulvar sclerite (Fig. 131)............................................................... Y. sp. B
4' Unpaired and paired parts of apodemes of S8 of similar length. Vulvar sclerite not scaly............................. 5
5 Vulvar sclerite weak, two elongate parallel sclerites caudally connected by a short transverse sclerite bridge (Fig. 68)............................................................................................. Y. ruficollis, n. sp.
5' Vulvar sclerite large, resembling a box with dorsal slit........................................................ 6
6 Paramedian crests of vulvar sclerite close together, caudal lobes hard, sharply pointed (Fig. 82)............ Y. longus, n. sp.
6' Paramedian crests of vulvar sclerite more widely separate, caudal lobes soft, lappet-like (Fig. 89)........ Y. mutilatus, n. sp.
7 Anterior ends of apodemes of S8 form a regular oval frame (e.g., Figs. 116, 132)................................... 8
7' Apodemes of S8 form an anteriorly widening frame with large sclerotized expansions along edge (Figs. 119, 124)......... 9
8 Vulvar sclerite a soft elongate body with several lobes on both ends (Fig. 133)................................ Y. sp. C
8' Vulvar sclerite with transverse sclerotized bar with short forward extensions on the sides (Fig. 116).. Y. micans (Klausnitzer)
9 Apodemes of S8 trapezoid with sclerotized expansions forming anterior wings extending forward beyond the delicate trans- verse connection between them, vulvar sclerite tube 5–6 times longer than wide (Fig. 124). T7 with small mediocaudal out- growth (Fig. 125)........................................................................ Y. angustus, n. sp.
9' Lateral expansions to apodemes of S8 distinctly behind oval front loop, vulvar sclerite tube at most 4 times longer than wide (Fig. 119). T7 unmodified.................................................................... Y. brevis, 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 pages 19-20, DOI: 10.11646/zootaxa.3846.1.1, http://zenodo.org/record/286792