Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer Author Zwick, Peter text Zootaxa 2014 3846 1 1 41 journal article 10.11646/zootaxa.3846.1.1 01a9d979-7b10-4c36-b1af-4acc2c0cb9a7 1175-5326 286792 97D4A04A-D75E-45CC-8A70-3EB3A4E94D9B 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.