Eurycyphon thunguttii, Zwick, Peter, 2015

Zwick, Peter, 2015, Australian Marsh Beetles (Coleoptera: Scirtidae). 8. The new genera Cygnocyphon, Eximiocyphon, Paracyphon, Leptocyphon, Tectocyphon, and additions to Contacyphon de Gozis, Nanocyphon Zwick and Eurycyphon Watts, Zootaxa 3981 (4), pp. 451-490 : 468

Eurycyphon thunguttii , n. sp.

( Figs. 49, 50 )

Type material. 1♂ holotype: New England NP 1500m NSW Thungutti Camp 14-15 Nov. 1982 J. Doyen coll. ( ANIC 857).

Habitus. Closely similar to E. barringtoni , BL 4.4mm, BL/BW ~1.5; relatively flat. Black, antennae and tarsi brownish. The fine semi-erect pilosity is grey. Antennae (antennomeres 8–11 missing) yellow, slender, pedicel not much thinner than scape, antennomere 3 a little thinner but distinctly longer than pedicel, distal antennomeres ~3– 4 times longer than apically wide. Both mandibles with small tooth, other mouthparts and legs unmodified.

Male. Segments 8 and 9 resemble E. barringtoni ( Figs. 43–46 ). However, no other species has a long anteriorly narrow pala. Caudally, the pala widens continuously up to the origin of trigonium and parameroids ( Fig. 49 ). Trigonium parallel, ending in two short lateral tips and a slender apically excised downcurved tongue. The parameroids are short sclerotized concave prongs ending in a short tip. They bear sensory pores. The wide rectangular tegmen is dorsoventrally curved, not plane, with a short stylus in the basal third ( Fig. 49 ). The tips of the parameres include a flat pale medial lobe with fine microtrichia and a sclerotized three-dimensional cap-like structure with complex internal folds. The appearance changes with angle of view, details not known ( Fig. 50 ).

Female. Unknown.

Note. E. thunguttii differs from the other species by its narrow pala. The angular corners of the penis tip somewhat resemble E. barringtoni , but the tongue-shaped process between them is much narrower in that species. The apices of the tegmen differ strikingly. The bicolourous E. fulvus differs also by its rounded penis tip.

Etymology. The name of the type locality is treated like a dedication name, as if it were a Latin noun in the genitive case.

Figures

FIGURES 49 – 51. Eurycyphon spp., males, II. E. thunguttii, n. sp.: 49, ventral view of tegmen and penis; 50, the same, apical portion, enlarged. E. aquilus Watts: 51, apical portion of tegmen and penis. pa, pala; pd, parameroid; pe, paramere; st, stylus; tr, trigonium.

FIGURES 41 – 48. Eurycyphon spp., males, I. E. fulvus Watts: 41, ventral view of S 9 (part), tegmen and penis; 42, the same, apical portion of penis and tegmen, enlarged. E. barringtoni, n. sp.: 43, T 8; 44, T 9; 45, S 8; 46, S 9; 47, ventral view of tegmen and penis; 48, the same, apical portion, enlarged. 43 – 46 to the same scale. pa, pala; pd, parameroid; pe, paramere; st, stylus; tr, trigonium.