Ypsiloncyphon

Zwick, Peter, 2014, Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer, Zootaxa 3846 (1), pp. 1-41 : 38

Ypsiloncyphon sp. B

( Figs. 129–131 )

Material studied. 1♀: “NT, Kakadu NP Gubara Spgs Burdulba Ck; 17-1-1992; monsoon vine for.; pans; D.Bickel \ Australian Museum K 303896“ (ÂMS). 1♀, “ 15.38S, 126.15E, CALM site 28/3 4 km W of King Cascade W.A. 12–16 June 1988 T.A.Weir \ at light closed forest“ ( ANIC).

Habitus. BL 1.85–2.20mm. Slender, parallel, mean BL /BW 1.9. Dorsal face uniformly brown, the slender antennae and the legs yellowish.

Male. Unknown.

Female. T7 with long curved apodemes, S7 with forward flexed nipple. Apodemes of S8 anteriorly merged, the unpaired sclerite about 1/3 of total segment length, the divergent branches turn caudally into elongate plates, each with long microtrichia along rear edge. Ovipositor long, coxites and stylites slender ( Fig. 129 ). Vulvar sclerite composed of a transverse arch which widens laterally and turns into wide sclerites. Together they form a sort of tube, leaving only a narrow ventral slot. Caudally the lateral surface has a pattern resembling scales ( Fig. 131 ). Dictyon composed of many cells, the largest with a flange-like extension along edge ( Fig. 130 ). Note. Endemic to the northwest of Australia. The vulvar sclerite of the smaller ♀from near King Cascade (where it was taken together with male Y. velatus ; conspecificity uncertain) is identical with that from the Darwin area but S8 is more slender, the unpaired sclerite is only about 1/4 of total length.

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.