Ypsiloncyphon

Zwick, Peter, 2014, Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer, Zootaxa 3846 (1), pp. 1-41 : 37

Ypsiloncyphon sp. A

( Figs. 127, 128 )

Material studied. 1♀: “ Type \ Port Darwin 92-20\ 5402\ Holotype \ Cyphon [unpublished manuscript name] Id. by J.Armstrong\ Head and thorax missing not present in drawer MVL Barclay 2012“; 1♀: “ Paratype \ 5015\ Adelaide River 92-2\ Paratype \ Cyphon [unpublished manuscript name] Id. by J.Armstrong“; both NHML. 1♀: “ 14.51S 125.50E, 1 km S mining camp Mitchell Plateau 13 May 1983 WA I.D.Naumann, J.C. Cardale ex ethanol“ (only one elytron and the dissected abdomen with genitalia remain); 1♀: “McArthur River, N.T. 16.05S 136.19E 2km SSE Borroloola 19–20.iv.1976 J.E.Feehan“; 1♀: “ 12.21S 130.42E Casuarina Beach NT. 10km NNE of Darwin 7.xi.72, rainforest behind beach, at light, E.Britton“ (all 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. Similar to female Y. longus from which it differs by the triangular (instead of rod-shaped) unpaired apodeme of S8 armed with a raised sharp triangle ( Fig. 127 ), and by the wide notch in the transverse bridge of the vulvar sclerite. Caudolateral lobes vaguely defined, appearing soft ( Fig. 128 ). Dictyon large, resembling that of Y. longus .

Notes. Restricted to the northwest of the continent. J. Armstrong had labelled the females in the London Museum as syntypes of a new species which, however, he never described. His manuscript name is not published so as not to create a nomen nudum.

Figures

FIGURES 127, 128. Ypsiloncyphon sp. A: 127, part of female terminalia, apodemes of S 8 (black mark points at the triangular process), vulvar sclerite in center; 128, vulvar sclerite, detail. Not to scale.