Ypsiloncyphon ruficollis, Zwick, Peter, 2014

Zwick, Peter, 2014, Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer, Zootaxa 3846 (1), pp. 1-41 : 21-22

Ypsiloncyphon ruficollis , n. sp.

(Figs. 62–69)

Type material. Holotype ♂ paratypes 3♂ 1♀, Indonesia: “Irian Jaya: Jayawijaya Langda 27.-– 28.8.1992 leg. A. Riedel 2100-– 2300 m “. 3 paratype ♀: “Irian Jaya: Jayawijaya, Larye (pr. Langda) 2200–2600m, 26.8.1992, leg. A. Riedel” (all SMNS).

Habitus. BL 1.7–1.8mm, BL /BW 1.5 in males, 1.7 in females. Legs and antennae yellowish red. Antennae short, stout, flagellar segments less than twice as long as wide. Otherwise strongly sexually dimorphic in colour.

Male. Head and pronotum bright red, elytra shining black, in side view strongly convex. Punctures large and dense, granular on head and pronotum, normal on elytra. Pilosity silvery.

T8 with short, straight apodemes not longer than the caudally strongly rounded plate. A sparse fringe of short setae rising from large, groove-like insertion rings along distal edge (Fig. 62). T9 bare, sclerotized, much narrower than T8, its slightly sinuous apodemes about 2.5 times longer than those of T8 (Fig. 63). S9 with slender capulus which is 1/4 the length of the shorter blade; no enlarged basal plate. Blade on the right hand side of the body with long filiform apex (Fig. 64). In situ the apex rests in a fold of the longer and wider left blade whose apical third curves to the right hand side and follows the contour of sternite 7. Penis much shorter than S9, narrow, slender, sides of the pointed trigonium gently curved. Base of trigonium much wider than the parameroids which are sinuous rods. The widest point of the penis is distally from where trigonium and parameroids separate. Basally from this point appears a wide weakly sclerotized field (Figs. 66–67). Tegmen and parameres Y-shaped, slender caudally tapering rods, unpaired base relatively long, anteriorly not widened (Fig. 65).

Female. Elytra rather flat. Dorsal face brown, head and front egde of pronotum reddish. Dorsal face only with normal punctures, a little finer than in males. Pilosity yellowish.

T8 and ovipositor not distinctive. S8 Y-shaped, all arms narrow and slender, the median unpaired one a little shorter than the divergent pair. Vulvar sclerite a small transverse bar supporting an anteriorly directed slender sclerite on each side (Fig. 68). Dictyon well developed, a ring of ca 9 large cells surrounds a central group of about 5 smaller cells (Fig. 69).

Etymology. The Latin adjective ruficollis , red-necked, describes the pigmentation of males.