Gymnopholus (Niphetoscapha) nitidus Gressitt & Sedlacek

Riedel, Alexander & Kilmaskossu, Agust, 2017, Revision of the subgenus Niphetoscapha Heller of Gymnopholus Heller (Coleoptera, Curculionoidea, Entiminae, Eupholini) and a new species with epizoic symbiosis from West New Guinea, Zootaxa 4254 (3), pp. 339-356 : 351-353

Gymnopholus (Niphetoscapha) nitidus Gressitt & Sedlacek

( Figs. 3–4 , 10 , 14 , 18 , 22 , 34 , 39 , 42 )

Gymnopholus (Symbiopholus) nitidus Gressitt & Sedlacek, 1967: 494 (type locality: Ibele valley).

Diagnosis. Body subglabrous, with sparse, thin setae. Elytra with subapical tubercles distinct, laterally projecting; elytral base usually with fovea filled with brownish exudates.

Redescription. Males ( Fig. 3 ). Length. Total length 20.0– 25.5 mm (n=6, x =23.7 ± 2.0); pronotum + elytron 11.5–20.0 mm (n=6, x =17.1 ± 3.6).

Color of integument black; body almost nude.

Head ( Fig. 10 ) weakly microreticulate, punctulate, between eyes subequal (1.01 X) to vertical diameter of eye. Eyes weakly prominent from outline of head. Gena ca. half as long (0.48 X) as vertical diameter of eye.

Rostrum ( Fig. 10 ) 1.99–2.48 X longer than wide at base (n=6, x =2.20 ± 0.19); maximum width in front of antennal insertion 1.33–1.49 X width at base (n=6, x =1.43 ± 0.07). Dorsum nude, with marked median impression; without dorsolateral furrows; antennal scrobes subglabrous, sparsely setose.

Antenna. Funicle + club 1.60–1.94 X length of scape (n=8, x =1.77 ± 0.13); club 3.78 X as long as wide.

Thorax. Pronotum 1.09 X longer than wide; sides weakly sinuate, widest in apical half; disc nude, densely punctate with minute punctures interspersed with coarse punctures; sides transversely rugose; medially with shallow impression. Thoracic venter subglabrous, with sparse thin setae; mesoventrite and mesocoxae with dense recumbent setae.

Elytron 3.91–4.32 X longer than wide between humeri (n=6, x =4.10 ± 0.15), at greatest width 1.07–1.15 X wider than between humeri (n=6, x =1.10 ± 0.04); sides weakly converging to subtruncate apex; almost nude, with sparse long setae; surface polished, with scattered punctures, but without distinct microsculpture or wrinkles; intervals 4–6 basally beside humerus with deep impression containing orange substance ( Fig. 39 ), presumably produced by glands; epipleural edge simple, without fringe of setae; apical declivity at suture with blunt knob, further ventrad with pair of distinct, laterally projecting knobs.

Legs. Surface somewhat shining, densely provided with granules and thin suberect setae. Femora weakly clavate, moderately long; metafemur in repose not reaching elytral apex.

Abdomen. Ventrite 1–2 medially concave; subglabrous, with sparse, thin setae; ventrite 5 flat, subapically densely setose. Penis ( Fig. 22 ) with asymmetrical apical tip markedly widened. Transfer apparatus ( Fig. 34 ) ca. 1.6 X as long as wide at base.

Females ( Fig. 4 ). Same as males except: Length. Total length 23.0–29.0 mm (n=6, x =26.3 ± 2.4); pronotum + elytron 17.0– 23.5 mm (n=6, x =20.5 ± 2.6). Rostrum 1.46–2.02 X longer than wide at base (n=6, x =1.78 ± 0.21); maximum width in front of antennal insertion 1.23–1.36 X width at base (n=6, x =1.31 ± 0.06).

Elytron wider, 3.79–4.11 X longer than wide between humeri (n=6, x =4.01 ± 0.12), at greatest width 1.10–1.19 X wider than between humeri (n=6, x =1.14 ± 0.03); sides more rounded.

Intraspecific variation. Elytral surface usually sparsely setose with suberect, shorter or longer setae, worn-off in older specimens; shape and depth of fovea at elytral base variable, larger or smaller, in some specimens completely absent; exudates usually but not always present in fovea of elytra base.

Material examined. WEST NEW GUINEA, Jayawijaya Reg.: 5 males, 1 female, Kwiyawagi , 2750 m, 9– 10.XII.1995 ( ARC) ; 3 males, 1 female, Wanuga—Kwiyawagi [S03 58´E138° 20´], 2750–3000 m, 9.XII.1995 (ARC); 2 females, Tiom—Wanuga , 2600–2900 m, 7.XII.1995 ( ARC) ; 2 males, 1 female, Tiom , Wanuga, 2750– 2900 m, 8.XII.1995 ( ARC) ; 6 males, 3 females, Moss forest between Theila and Lake Habbema, 2800–2950 m, 22.X.1993 ( ARC, SMNK) ; 1 male, Theila -> Lake Habbema, ca. 2000 m, 17.X.1993 ( ARC) ; 4 males, 5 females, Theila , 2500 m, 23.X.1993 ( ARC, SMNK) ; 2 females, Jiwika -> Wandaku [S03° 56.5’ E138° 57.1’], 1700–2300 m, 2.IX.1991 (ARC); 1 female, Pass Valley [E 139°05´S 03° 51´], 1900 m, 15–16.IX.1990 ( ARC) ; 3 males, 1 female, Ilugwa [E 138° 55´S 03° 51´], Melanggama , 1900–2200 m, 9–12.IX.1990 ; 17 males, 16 females, Yohosim—Kiroma , 2500–2700 m, 13.XI.1991 ( ARC, SMNK) ; 8 males, 6 females, Kiroma [S04 14.83´E139° 10.77´], ca. 2500 m, 13.IX.1991 (ARC); 2 males, 2 females, Kiroma—Gn. Elit , ca. 2800–3300 m, 14.IX.1991 ( ARC) ; 1 male, N Wamena, Poga [E 138° 32´S 03° 50´], 2100–2500 m, 6–7.IV.1999 (ARC); 2 exx ( ARC 2637 , ARC 2638 ), W Wamena, road to Lake Habbema , S04° 08.256´E138° 49.049´, 2770 m, 20-VII-2010 ( SMNK) ; 2 exx (ARC2640, ARC2643), N Wamena, Poga, S03° 47.575´E138° 33.155´to S03° 47.473´E138° 33.163´, 2620– 2715 m, 15-VII-2010 (SMNK).

Other material reported. WEST NEW GUINEA, Jayawijaya Reg.: Holotype, male, Moss forest camp [E 138° 43´S 04° 00´], 2600–2800, 9.X.–5.XI.1938, Neth. Ind.-Amer.-New Guinea Exped. ( BPBM 7461 ); 21 paratypes, same data as holotype ; 11 paratypes, Moss forest camp [E 138° 43´S 04° 00´], 2850 m, 23.VIII.1938 ; 1 female, Iebele Camp, 2250 m (NNML); 22 paratypes, Iebele Camp [E 138° 46´S 03° 58´], 2250 m ; 1 paratype, Lake Habbema [E 138° 40´S 04° 08´], 3250–3300 m, ult.VII-ult. VIII.1938. ( Gressitt & Sedlacek, 1967).

Distribution ( Fig. 42 ). Paniai Reg. (Kwiyawagi, Tiom, Poga, area below Lake Habbema, Ibele, Ilugwa, Jiwika, Pass Valley, Kiroma). Elevation: 1900–2800 m.

Figures

FIGURE 39. Elytral base of Gymnopholus (Niphetoscapha) nitidus with exudates. FIGURES 40 a – b. Gymnopholus (Niphetoscapha) inexspectatus sp. n., live specimen with incrustrations of algae and lichens; photographs M. Wild, Mokndoma.

FIGURE 42. Distribution of G. (Niphetoscapha) audax and G. (Niphetoscapha) nitidus. Base map created with GeoMapApp (http: // www. geomapapp. org).

FIGURES 1 – 4. Habitus of Gymnopholus (Niphetoscapha) spp., dorsal aspect: (1) G. audax, male; (2) G. audax, female; (3) G. nitidus, male; (4) G. nitidus, female.

FIGURES 9 – 12. Head and rostrum of Gymnopholus (Niphetoscapha) spp.: (9) G. audax; (10) G. nitidus; (11) G. inexspectatus sp. n., holotype; (12) G. wichmanni, lectotype.

FIGURES 13 – 16. Pronotum of Gymnopholus (Niphetoscapha) spp., female: (13) G. audax (14) G. nitidus; (15) G. inexspectatus sp. n., allotype; (16) G. wichmanni, lectotype.

FIGURES 17 – 20. Elytral apex of Gymnopholus (Niphetoscapha) spp., female; in dorsoapical aspect (left), in profile (right): (17) G. audax; (18) G. nitidus; (19) G. wichmanni, lectotype; (20) G. inexspectatus sp. n., allotype.

FIGURES 21 – 24. Gymnopholus (Niphetoscapha) spp.; Male genitalia; body of penis in dorsal aspect (left), in profile (right): (21) G. audax; (22) G. nitidus; (23) G. inexspectatus sp. n., holotype; (24) G. wichmanni, paralectotype.

FIGURES 33 – 38. Gymnopholus spp.: (33) Transfer apparatus of G. inexspectatus sp. n., holotype; (34) Transfer apparatus of G. nitidus; (35) Left wing of G. (Symbiopholus) lichenifer; (36) Left wing of G. (Niphetoscapha) inexspectatus sp. n., allotype; (37) labels of G. wichmanni, lectotype; (38) labels of G. wichmanni, paralectotype.