Eurycyphon falcatus, 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 : 468-471

Eurycyphon falcatus , n. sp.

( Figs. 52–55 )

Type material: 1 ♂ holotype (given to ANIC), 1 ♂ paratype ( PZ):? Victoria. See notes!

Habitus. BL 4.0mm, BL/BW ~1.36. Similar to E. thunguttii exept a little smaller and more convex. Elytral punctures a little finer. Mandibular teeth very small. Only the genitalia permit reliable distinction.

Male. Segments 8 and 9 similar to E. barringtoni ( Figs. 43–46 ). The tegmen ( Fig. 52 ) is a wide arch which increases about threefold in sclerite width where the long, bar-like parameres begin. At the same level a rudimentary stylus attaches to the outside. The parameres converge caudally. Originating laterally is a large subterminal sickle-shaped process. The medial terminal part is plate-like with a short horn with fine pores on the outside. The blunt medial lobes of the counterparts touch in the middle. The horn-like processes at the apex are curved in opposite directions and overlap ( Fig. 55 ).

The wide front of the long pala is not clearly visible but appears to be semicircular. The caudal half of the pala has gently convex sides and is of approximately uniform width ( Fig. 52 ). The trigonium is about three times as long as wide, with wide rounded tip which bears a sharply bifid ventral appendage. The concave parameroids are about half as long as the trigonium. They bear sensory pores and end in an external point ( Figs. 53, 54 ).

Female. Unknown.

Note. The origin of the specimens is not known. They were probably collected in Victoria by a visitor to Monash University, Melbourne. The specimens bore a code number instead of a locality label. The field notebook had been lost by the time the specimens were given to me.

Etymology. The name alludes to the shape of the paramere, the Latin adjective falcatus meaning sickle-shaped or armed with a sickle.

Figures

FIGURES 52 – 60. Eurycyphon spp., males, III. E. falcatus, n. sp.: 52, ventral view of tegmen and penis; 53, 54, apex of penis in ventral and lateral views, enlarged; 55, apex of tegmen and parameres enlarged; left half of figure in ventral, right half in dorsal view. E. tricornis, n. sp.: 56, antenna; 57, T 8; 58 S 8; 59, tegmen and parameres; 60, penis in dorsal view. 53 – 55, 57 – 58, and 59 – 60 to the same scales, respectively. 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.