Ypsiloncyphon

Zwick, Peter, 2014, Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer, Zootaxa 3846 (1), pp. 1-41 : 40

Ypsiloncyphon sp. C

( Figs. 132, 133 )

Material studied. 1♀: “Millstream WA, 8.Apr.1971, D.H.Colless“ ( ANIC).

Habitus. BL 1.80 mm, elongate, body damaged, BL /BW ~ 1.9. Brown, with yellowish legs and antennae.

Male. Unknown.

Female. T7 with moderately long apodemes, S7 without nipple, margin regularly arched. T8 with large plate with dispersed minute setae, basally well sclerotized, caudally increasingly soft, edge not visible. Apodemes very long. S8 long and narrow, apodemes strong, straight, anteriorly curved towards each other and merging. A flange of weaker sclerotization around this connection. Apodemes strong and dark over most of their length, caudally becoming abruptly transparent and bearing a microtrichial fringe ( Fig. 132 ). Vulvar sclerite a poorly sclerotized rather large tube, both ends dividing into several soft lobes whose form is not well visible ( Fig. 133 ). Dictyon lost during manipulation.

Note. This form possibly represents the female of Y. virgulifer n. sp. which was also taken near Millstream, but in a different year, not together with the present female.

Figures

FIGURES 129 – 133. Ypsiloncyphon sp. B (129 – 131; from near King Cascade) and Y. sp. C (132, 133); 129, female terminal segments, with vulvar sclerite in situ; apodemes of S 8 black; 130, dictyon; 131, vulvar sclerite, enlarged, not to scale. 132, female segment 8, apodemes of S 8 black, flange grey; 133, vulvar sclerite. 129 & 130, and 132 & 133 to the same scale, respectively.