Ypsiloncyphon brevis, 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 : 34-35

Ypsiloncyphon brevis , n. sp.

( Figs. 117–120 )

Type material. QLD: Holotype ♂: “Sth. Pine R., 17.i.63 QLD. G. Monteith” ( QMSB, UQIC 88674). Paratypes: 4♂ 1♀with the same data (all QMSB, UQIC 88666, 88668, 88671–88673). 2♂ 2♀: “Broken R, Eungella Qld. 8 Dec. 1961 McAlpine & Lossin”; 1♀: “Upper Broken R, Eungella Qld. 12 Dec. 1961 McAlpine & Lossin” (all AMS). − 1♀: “Junction of Goldmine & Davies Cks, Kuranda - Mareeba Rd. N.Qld. 3 May 1967, D.H.Colless”; 1♂: “Fringing Forest, Mulgowie S.E.Qld., 19, M.D.Peart \ A495 23: v1:81”; 3♂: “Fringing Forest, Mulgowie S.E.Qld., 19, M.D.Peart \ A495 13:x:81 \ ANIC Coleoptera Voucher No. 84-0050”; 1♂: same data, except 11:v:81; 1♂: “Gillies Highway 2 km W. of Little Mulgrave N.Qld 18.Apr.1967 D.H.Colless”; 1♂: “Biggenden, Q., 25.31S 152.03E, Degilbo Ck. 7.v.72, H.Frauca”. 1♀: 17°32'S 145°31'E GPS QLD: The Millstream 9 km NNE of Ravenshoe 1045m, 18-21 Jan 2009; A.Slipinski et.al. Light trap“ (all ANIC).

Additional material studied. 1♂: “Fringing Forest, Mulgowie S.E.Qld., 19, M.D.Peart \ A495 ii:v:81 \ ANIC Coleoptera Voucher No. 84-0050“ (genital preparation only; body lost; ANIC).

Habitus. ♂ BL 1.7–1.9 mm, BL /BW ~1.6; ♀ BL 1.7–2.1 mm, BL /BW ~1.8. Black, legs and antennae yellowish.

Male. Apodemes of T9 on average less than twice (1.5–2.1; n=7) as long as those of T8. S9 and penis of similar length. Blades of S9 very different, the slightly shorter one wide over most of its length, caudal third then abruptly restricted to an outwardly curved filament. The longer blade anteriorly very wide and conical, beyond midlength rapidly restricted to an almost straight pointed end section ( Fig. 117 ). Capulus as long as 40% of penis length, very narrow, but base plate-like. The penis is stout, widest caudally from the insertion of trigonium and parameroids. Basal half of trigonium wide, parallel-sided, then strongly narrowed to the conical tip. Pala length makes up 40% of penis length. Anterior plate of pala angular, wide, its waisted middle section short. Parameroids conical, little longer than trigonium, their tips widely separate from the trigonium apex and a little more blunt ( Fig. 118 ). Tegmen (not shown) shorter than penis, parallel-sided, anteriorly not widened, parameres ending in long thin tips.

Female. Apodemes of S8 with triangular, with wing-like lateral expansions shortly before the regular frontal arch. Vulvar sclerite composed of two elongate sclerites which at their caudal ends are connected by a short sclerite bridge ( Fig. 119 ). Dictyon large, with many meshes, the largest cells with marginal extensions, resembling a cogwheel ( Fig. 120 ).

Notes and etymology. The common occurrence of males and females in the southern part of the species' range permitted reliable association of sexes. The short vulvar sclerite corresponds to the stout short shape of the penis, hence the specific name based on the Latin adjective brevis , meaning short.

Figures

FIGURES 117 – 120. Ypsiloncyphon brevis, n. sp.: 117, male S 9; 118, penis, dorsal (Sth. Pine R.); 119, female terminal segments with vulvar sclerite, apodemes of S 8 black, expansions grey (Goldmine & Davies Cks); 120, dictyon. All to the same to scale.