Eurycyphon

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 : 466

Key to males of Eurycyphon

1 Dorsal side strikingly bicolourous......................................................................... 2

1' Dorsal side unicolourous................................................................................ 3

2 Base strikingly lighter than rest of elytra........................................................ E. fulvus Watts

2' Fore body bright red, elytra dark........................................................... E. tomweiri n. sp.

3 Head and pronotum with coarse granular punctures; terminalia Figs. 68–73 ........................... E. perlatus n. sp.

3' Normal fine punctures on entire surface.................................................................... 4

4 Pala and distal part of penis of similar length, parameroids longer than trigonium (e.g., Figs. 63 , 75 ). Plate of T8 transverse, short stout pegs along caudal edge ( Figs. 61, 65 )............................................................. 5

4' Pala 2 or more times longer than the trigonium which is longer than the parameroids (e.g., Figs. 41 , 49 ). No pegs along caudal edge of T8........................................................................................... 6

5 Parameroids ending in a long curved spine; trigonium with long apical process ( Fig. 63 )............... E. castaneus n. sp.

5' Trigonium and parameroids without long pointed processes ( Fig. 75 )................................. E. parvus n. sp.

6 Trigonium spherical, with 3 horn-like processes ( Fig. 60 )......................................... E. tricornis n. sp.

6' Trigonium parallel-sided, no horns, only a delicate tongue directed ventrad from apex (e.g., Fig. 41 ).................... 7

7 Each paramere ventrally with a large triangular sclerite, the paramere apex is a slender plate with serrate ventral edge ( Fig. 51 )........................................................................................ E. aquilus Watts

7' No separate ventral subterminal sclerites on parameres....................................................... 8

8 Paramere ending in two hooks curved in opposite directions ( Figs. 52, 55 )........................... E. falcatus n. sp.

8' Apex of paramere a compact convoluted body (e.g., Figs. 48 , 50 )............................................... 8

9 Penis waisted, front of pala wide, a strong hook projects from paramere apex ( Figs. 47, 48 ).......... E. barringtoni n. sp.

9' Pala lanceolate, front narrow, tegmen without projecting tooth at apex ( Figs. 49, 50 )................... E. thunguttii n. sp.

Figures

FIGURES 68 – 75. Eurycyphon spp., V. E. perlatus, n. sp., male: 68, T 8; 69, T 9; 70, distal portion of S 9; 71, tegmen and parameres; 72, penis. Female: 73, prehensor; 68 – 72 to the same scale. E. parvus, n. sp., male: 74, head, with details of palpi; 75, the superimposed terminalia. pe, paramere; st, stylus.

FIGURES 61 – 67. Eurycyphon spp., males, IV. E. castaneus, n. sp.: 61, T 8; 62, T 9; 63, penis; 64, tegmen, with S 9 in the background; 68 – 70 and 71 – 73 to the same scale, respectively. E. tomweiri, n. sp.: 65, T 8, with enlarged detail of caudal edge; 66, T 9, apodemes of S 9 in centre visible by transparency; 67, penis and tegmen, superimposed. All to the same scale. pd, parameroid; pe, paramere; st, presumed 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.

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 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.