Nothocyphon triangulum, Zwick, Peter, 2015

Zwick, Peter, 2015, Australian Marsh Beetles (Coleoptera: Scirtidae). 7. Genus Nothocyphon, new genus, Zootaxa 3981 (3), pp. 301-359 : 344-345

Nothocyphon triangulum , n. sp.

( Figs. 112, 113 )

Type material: 1 ♂ holotype: Mt. Wellington Tas. Lea ( SAMA). Paratypes: 1♂ with the same data as the holotype; 8♂: Cyphon Tasmania 8801 Summit of Mt. Wellington Tas. (Lea) ( SAMA). 1♂: 42.41S 146.43 TAS, National park, low bushes entrance to NP, Feb. 1992, C.Reid (naturally everted genitalia; ANIC). 1♂: 42.40S 146.46E TAS, Mt. Field NP, Robert Tarn 1220m, 7 Feb 1992 C.Reid on flowers; 1♂: 42.40S 146.41E TAS 2.5km W Mt. Field NP c. 600m, 6. Feb.1992 C.Reid on Nothofagus cunninghamii; 1♂: Mt. Wellington TAS Lea Hobart Tasmania J.J.Walker (all ANIC); 1♂: Hobart Tasmania J.J.Walker \ G.C.Champion coll. B.M. 1927-409 ( NHML).

Habitus. BL 1.6–1.8mm, BL/BW ~1.7. Elongate oval, dorsal side entirely brown, head darkest, the sutural interval may have a reddish tinge. The semi-erect pilosity is brownish. Head with fine, pronotum with slightly coarser dense granular punctation, normal dense punctures on elytra little larger.

Male. Segments 8 and 9 as for the genus, the pilose lobes of S9 large. The slender penis is waisted between the wide truncate front edge of pala and the transverse bridge where parameroids and trigonium originate. The trigonium is flat, triangular. The widest point is near the base where blunt lateral angles project over the base of parameroids. The convergent sides are straight and meet at a blunt angle of about 40°. Sides of triangle with small teeth. The finger-shaped slightly curved parameroids are a little longer than the trigonium, their apices almost meet behind the trigonium tip. The tegmen is a narrow sclerite bracket supporting the short parameres. Each is an elongate somewhat twisted sclerite with several large hooks along the sides.

Female. Unknown.

Note. Endemic to Tasmania. The holotype has partly extruded genitalia. The large lobes of S9 stand in vertical position laterally from the penis, like shields. The penis base is straight, the parameroids and the trigonium curve gently into opposite directions. Parameres not visible.

Etymology. The specific name describes the shape of the trigonium and is a Latin noun in apposition, triangulum , a triangle.

Figures

FIGURES 112 – 114. Nothocyphon triangulum - group, males. N. triangulum, penis, tegmen and parameres in dorsoventral views: 112, ventral view, with contour of T 8 in the background; 113, dorsal view, with lobes of S 9. — N. radula, 114, penis, tegmen, parameres and S 9 in dorsal view. 112, 113 to the same scale.