Polydrusus (Polydrusus) wymanni, Borovec, Roman & Germann, Christoph, 2013

Borovec, Roman & Germann, Christoph, 2013, Two new species of Polydrusus (Polydrusus) from Turkey, Iran and Greece (Coleoptera: Curculionidae: Entiminae: Polydrusini), Zootaxa 3693 (1), pp. 75-84 : 78-82

Polydrusus (Polydrusus) wymanni sp. n.

( Figs 3–6 , 8 )

HOLOTYPE. 3, GREECE, Samos, Isl. W-Agios, Paraskevi, Nisi, N 37° 46 59, E 26° 58 50, 20 m, Strandfels- Vegetation, 4.4.2010, C. Germann lgt. Red label: Holotype Polydrusus (Polydrusus) wymanni sp. n. Borovec & Germann, 2013 (NMBE).

PARATYPES. 5 3313 ƤƤ, same data as holotype (CCG, RBO, NMBE); 3 Ƥ, GREECE, Samos Isl., Oros Kerkis, Evangelistrias Monastery Umgb., N37°42 53 / E26°38 26, 680 m, GS Laubstreu ( Q. coccifera ), 5.4.2010, C. Germann lgt. (CCG).

Length: 3.03–3.94 mm, holotype 3.31 mm.

Entire body light rusty brownish, in several specimens pronotum and head darker. ventrites with piliform semiadherent setae.

Rostrum short and wide, in males 1.29–1.33, in females 1.27–1.39 times as wide as long, with strongly rounded sides, significantly constricted near base. Epifrons with concave sides, at base distinctly more slender than inner edges of eyes. Epistome hardly visible, V-shaped, indistinctly keeled posteriorly. Antennal scrobes visible as wide furrows in apical two thirds of rostrum in dorsal view; in lateral view perpendicularly curved, sharply keeled, dorsal margin parallel with dorsal border of rostrum, barely reaching lower margin of eye, distance between eye and scrobe twice as wide as width of one adherent scale. Rostrum separated from rest of head by shallow and wide transverse furrow. Interocular space flat. Eyes large, strongly bulged, conspicuously protruding from outline of head, in males larger than in females.

Antennae slender. Scape slender, 0.9 times as long as funicle, at midlength somewhat curved, in apical third to quarter regularly enlarged. Antennomere 1 twice as long as wide, about equally long as antennomere 2, which is more slender, 2.0–2.2 times as long as wide. Antennomeres 3 and 4 1.5–1.7 times as wide as long; antennomere 5 1.3 times as long as wide; antennomere 6 1.2 times as long as wide; antennomere 7 1.0–1.1 times as long as wide. Club slender, 1.9–2.1 times as long as wide.

Pronotum in males slender, 1.07–1.09 times as wide as long, in females larger, 1.11–1.15 times as wide as long, widest in the middle, narrower at anterior border, shallowly constricted before anterior border, with moderately rounded sides. Pronotum in lateral view moderately rounded.

Scutellum small, rounded.

Elytra in males very slender, more slender than in females: in males 1.91–1.96, in females 1.78–1.81 times as long as wide, with almost straight sides, parallel-sided, apical quarter rounded. Elytra in lateral view moderately rounded. Striae narrow, distinctly punctured, intervals flat.

Legs slender, all femora edentate. All tibiae with long spiniform mucro, only metatibia in female with short, indistinct mucro. Tarsi in both sexes identical. Tarsomere 2 1.2–1.3 times as long as wide; tarsomere 3 1.4–1.5 times as wide as long and 1.6 times as wide as tarsomere 2. Ungular tarsomere 1.4–1.5 times as long as previous one.

Penis slender, long, pointed. In dorsal view widest at base; along entire length almost regularly tapered to apex, more strongly in apical third with weakly convex sides, at apex very slender; apex offset, slender, drop-shaped. In lateral view penis regularly and weakly curved, regularly tapered, with offset triangular apex.

Female genitalia. Ventrite 8 with very long and slender apodeme, distinctly constricted before plate, Y-shaped at apex. Plate small, sclerotised mainly along lateral sides, subtrapezoidal with concave margo apicalis. Hemisternite of ovipositor slender, tapered, with short apical styli, laterally prominent. Spermatheca C-shaped, with short and robust cornu, large corpus and short and wide ramus and nodulus, equally large, indistinctly separated.

Sexual dimorphism. Males have a shorter and wider rostrum and larger eyes than females. Males also have a more slender pronotum and elytra. Males have conspicuously shorter raised elytral setae.

Variability. Vestiture of dorsal part of body varied. Obliquely transverse stripe in basal third of elytra is well developed in several specimens, but inconspicious or even missing in others. Also, pronotum and head with rostrum either with lateral whitish longitudinal stripes or disc also covered by whitish adherent scales.

Etymology. The species is named after Hans-Peter Wymann—amiable colleague, graphic artist and specialist of Lepidoptera—in memory of the joint excursions together with the second author to Samos and Crete Island.

Bionomy. The new species was collected from flowering Quercus ilex -trees and Q. coccifera -shrubs on the coast rocks just above the sea shore ( Fig. 13 ) together with Polydrusus cocciferae Kiesenwetter, 1864 and Oedecnemidius varius (Brullé, 1832) . An additional three specimens of P. wymanni sp. n. were sifted on the Oros Kerkis from leaf litter under Quercus coccifera shrubs at 680 m a.s.l.

Differential diagnosis. The new species belongs to the following group of species: P. cressius Pic, 1904 (known from Crete, its type locality), P. mecedanus Reitter, 1908 (known from continental Greece), P. m o r i c e i Pic, 1904 (known from the southern Ionian Islands and Thessaly, see records below) and P. tonsus (Desbrochers, 1897) (known from Anatolia) based on the tibiae, which do not show conspicuously prominent long erect setae.

Males of P. wymanni sp. n. differ from those of P. cressius and P. t o ns u s by i) longer raised elytral setae, which are semierect and as long as half the width of one interval at the elytral declivity (in P. cressius and P. t o n s u s setae are semiadherent and shorter than half the width of one interval in elytral declivity), and by ii) larger eyes with ratio between narrowest interocular space and longitudinal diameter in dorsal view in P. wymanni sp. n. 1.29–1.31 (in P. cressius ratio is 1.46–1.54, in P. t o n s u s 1.48–1.57), and by iii) the different apex of the penis. From P. moricei , males of P. wymanni differ by i) the bigger size (3.03–3.94, whereas P. m or i c ei range from 2.7–3.1), by ii) the elytral setae which are raised at an angle of 30° ( P. moricei : 45°), and by the tip of the penis. From P. mecedanus , males of P. wymanni differ by i) the shorter pronotum, 1.07–1.09 times as wide as long (whereas in P. mecedanus the pronotum is 1.08 times as long as wide), by ii) the adherent scales brownish with whitish stripes (the adherent scales of P. mecedanus are unicolored, greyish with green sheen), and by the penis, which is regularly tapered anteriorly in ventral and lateral view (in P. mecedanus the penis is equally wide along the whole length, except for the apex in ventral and in lateral view).

Females of P. wymanni sp. n. differ from those of P. cressius , P. moricei and P. t o n s u s by i) conspicuous semierect elytral setae, which are as long as the width of one interval in elytral declivity, while P. cressius , P. moricei and P. t o n s u s females have semiadherent inconspicuous setae, which are at most as long as half the width of one interval in elytral declivity, and by ii) the different shape of the spermatheca.

Figures

FIGURE 13. Quercus ilex - trees and Quercus coccifera - shrubs on limestone: habitat of Polydrusus wymanni sp. n. on Samos Island at Nisi, April 2010.

FIGURES 3 – 4. Polydrusus wymanni sp. n. male 3) dorsal view; 4) lateral view.

FIGURES 5 – 6. Polydrusus wymanni sp. n. female 5) dorsal view; 6) lateral view.

FIGURES 7, 8, 11. Polydrusus kadleci sp. n. 7) Penis lateral view; 8) Ditto dorsal view; 11) spermatheca. Figs 9, 10, 12. Polydrusus wymanni sp. n. 9) Penis lateral view; 10) Ditto dorsal view; 12) spermatheca.