Penthoscapha Heller 1914

Riedel, Alexander, 2009, Revision of the genus Penthoscapha Heller (Coleoptera, Curculionoidea, Entiminae, Eupholini) with notes on the genera of Eupholini from New Guinea, Zootaxa 2224, pp. 1-29 : 4-5

Penthoscapha Heller 1914

Type-species: Penthoscapha lorentzi, 1914 , by monotypy.

Diagnosis. Rostrum relatively short, ca. 1.50–1.88 X longer than wide at base (longer in P. similis ). Gena relatively long, subequal to vertical diameter of eye (0.97–1.21 X). Sutural interval of elytron at apical declivity forming blunt protrusion visible in lateral aspect and / or with cluster of suberect setae. Tarsi elongate, tarsomere 1 of metatarsus 1.7–2.4 X as long as wide, tarsomere 2 0.8–1.5 X as long as wide. Apical orifice of aedeagus retracted and delimited by angulately projecting pair of sclerites.

Redescription. Males. Length. Total length 13.2–19.0 mm; pronotum + elytron 10.0–15.0 mm. Body usually without dense vestiture, scales absent, sparse or arranged in localized patches. Cuticle with exudations of yellowish substance easily lost in dead specimens (not verified for P. l o re n t z i).

Head sparsely setose or subglabrous, shining or with faint lustre; frons between eyes relatively wide, 1.07–1.29 X as wide as vertical diameter of eye, punctate, at middle with fovea and / or furrow. Eyes weakly to markedly prominent from outline of head. Vertical diameter of eye 1.11–1.17 X horizontal diameter. Gena relatively long, subequal to vertical diameter of eye (0.97–1.21 X), sides weakly converging to subparallel.

Rostrum relatively short ( Figs. 32–35 , 40), ca. 1.50–1.88 X longer than wide at base (2.07–2.30 X longer than wide in P. similis , fig. 36). Epistome heart-shaped, posteriorly hardly delimited against dorsum of rostrum. Dorsum relatively flat; with more or less distinct shallow impression, sometimes containing very low median ridge. Ventral surface of rostrum along midline with deep, more or less densely setose furrow.

Antenna. Funicle + club 1.59–2.02 X length of scape; scape and funicle sparsely setose with thin recumbent and thicker dehiscent setae; club long, 3.11–3.65 X as long as wide.

Thorax. Pronotum ca. as long as wide, or wider than long (0.98–1.22 X); sides more or less sinuate, widest in anterior half; disc in front of middle with more or less distinct impression. Scutellum distinct, but laterally more or less overhung by elytra, sparsely setose, shape intraspecifically variable, oblong, hourglassshaped or trapezoid with narrow base.

Elytron medially fused in P. gerhardschereri , free in other species; 3.92–4.65 X longer than wide between humeri; greatest width slightly in front of middle, 1.08–1.21 X wider than between distinct humeri; sides evenly rounded or subangulate; epipleural edge with fringe of lanceolate scales or setae; sutural interval at apical declivity forming sparsely setose, blunt protrusion visible in lateral aspect ( P. pulverea : without this protrusion, only with loose cluster of setae); laterally without distinct knobs or projections. Ala ( Figs. 26–31 ) short, probably non-functional in all species (uncertain in P. similis ), length 8.8–10.0 mm, 0.94–1.41 X length of elytron.

Legs. Femora very weakly clavate, subapically with construction, unarmed; long or moderately long. Metafemur in repose reaching or almost reaching elytral apex. Tibiae ventrally more or less distinctly denticulate, apically mucronate; metatibia apically with distinct, squamose or glabrous bevel. Tarsi elongate, tarsomere 1 of metatarsus 2.3–2.4 X as long as wide (in P. similis 1.7X as long as wide), tarsomere 2 1.1– 1.5 X as long as wide (in P. similis tarsomere 2 0.75 X as long as wide).

Abdomen. Ventrite 1–2 medially concave; apical margin of ventrite 5 broadly convex. Genitalia. Aedeagus ( Figs. 41–51 ) with sides subparallel beyond apical orifice, subapically more or less distinctly constricted, apex extended (P. s i m i l i s: sides weakly sinuate, converging from base to pointed apex); apical orifice relatively far basad, behind apical 1/3 of aedeagal body, delimited by angulately projecting pair of sclerites. In lateral aspect body of aedeagus curved ventrad, apical tip more or less distinctly curved dorsad. Endophallus with sting-like, more or less elongate transfer apparatus (Figs. 39, 43, 46, 49, 52).

Females. Same as males except: Size larger, total length 17.0–23.0 mm; pronotum + elytron 14.0– 18.0 mm. At least one species ( P. gerhardschereri ) with conspicuous squamose patches absent in males. Rostrum ca. 1.50–1.65 X longer than wide at base (1.97–2.18 X longer than wide in P. similis ). Elytron wider, both laterally and dorsally more convex; 3.56–4.16 X longer than wide between humeri; greatest width slightly in front of middle, 1.17–1.35 X wider than between humeri; apices of both elytra jointly rounded (except sutural interval apically extended into short, acute process in P. gerhardschereri ). Legs. Femora slightly shorter; in P. gerhardschereri distinctly shorter. Tarsi shorter ( P. gerhardschereri ) or longer (in P. similis ). Abdomen. Ventrite 1–2 medially convex; ventrite 5 subtriangular, apically narrowly rounded. Terminalia. Sternite VIII ( Figs. 58–59 ). Membrane below rectum and above genital pouch leathery, sclerotized. Hemisternite ( Fig. 53–55 ) 2.3–2.8 X as long as high, apical half subtrapezoid, apically with broad angulate notch. Stylus 2.8–3.5 X as long as wide, subapically with cluster of moderately long stiff setae pointing laterad. Vagina ( Fig. 60–61 ) without distinct sclerites. Bursa copulatrix terminally almost continuous with ductus spermathecae; ductus spermathecae basally widened, more than 10 X as wide as before insertion at spermatheca, curved, internally sclerotized. Spermatheca ( Figs. 62–64 ).

Figures

FIGURES 32 – 35. Head and rostrum of Penthoscapha species: (32) P. l o re n t z i, lectotype (33) P. gerhardschereri, holotype; (34) P. doormanensis, holotype; (35) P. pulverea, holotype.

FIGURES 26 – 31. Left wing of Penthoscapha species: (26) P. t o x o p e i, paratype; (27) P. similis, holotype; (28) P. doormanensis, holotype; (29) P. p u l v ere a, holotype; (30) P. gerhardschereri, holotype; (31) P. l o re n t z i, lectotype.

FIGURES 41 – 43. Penthoscapha lorentzi, lectotype: (41) aedeagus, dorsal aspect; (42) aedeagus, lateral aspect; (43) endophallus with transfer apparatus.

FIGURES 53 – 59. Female terminalia of Penthoscapha species: (53) hemisternite of P. toxopei, paratype; (54) hemisternite of P. gerhardschereri, allotype; (55) hemisternite of P. similis, allotype; (56) tergite VII of P. gerhardschereri, allotype; arrow marking wing-folding patch; (57) tergite VII of P. similis, allotype; arrow marking wing-folding patch; (58) sternite VIII of P. gerhardschereri, paratype; (59) sternite VIII of P. similis, allotype.

FIGURES 60 – 66. Female terminalia of Penthoscapha species: (60) P. t o x o p e i, paratype; (61) P. similis, allotype; (62) P. toxopei, paratype, spermatheca; (63) P. gerhardschereri, allotype, spermatheca; (64) P. similis, allotype, spermatheca; (65) P. gerhardschereri, allotype; tergite VIII and ductus spermathecae; (66) P. similis, allotype, tergite VIII.