Pachyrhynchus yoshitakei, Bollino & Rukmane & Mohagan, 2020

Bollino, Maurizio, Rukmane, Anita & Mohagan, Noel, 2020, Two new Pachyrhynchus (Curculionidae: Entiminae: Pachyrhynchini) from Misamis Occidental (Mindanao, The Philippines), Zootaxa 4852 (3), pp. 323-332 : 324-325

Pachyrhynchus yoshitakei sp. nov. Bollino & Rukmane

( Figs. 1 A–D)

urn:lsid:zoobank.org:act:92D86CA8-FAB5-446C-AD06-75BD7555914C

Type material. Holotype, male ( Figs.1 A–B): Philippines—Mindanao I. / Mt. Capole—Sebucal / Mt. Malindang Range / Oroquieta City—(Misamis Occidental) / 4–8.II.2020 —m. 900–1100 / Lgt. D. Mohagan—coll. M. Bollino (typed on white card) // HOLOTYPE / Pachyrhynchus yoshitakei / BOLLINO & RUKMANE, 2020 (typed on red card), presently in MBLI, will be deposited in SMTD .

Paratypes (7♂♂, 12♀♀): 2♂♂, 2♀♀ same data of the holotype ; 2♂♂, 4♀♀ Philippines—Mindanao I. / Lake Duminagat—Mt. Ginlajan / Mt. Malindang Range / Brgy. Gandawan-(Misamis Occidental) / 3–6.II.2020 —m. 1700–1900 / Lgt. D. Mohagan—coll. M. Bollino ; 1♂ Philippines—Mindanao I. / Mt. Malindang Range / Brgy. Mansawan (Misamis Occidental) / 9–10.II.2020 —m. 800–900 / Lgt. D. Mohagan—coll. M. Bollino ; 2♂♂, 6♀♀ Philippines—Mindanao I. / Lake Duminagat—Mt. Ginlajan / Mt. Malindang Range / Brgy. Gandawan-(Misamis Occidental) / 3–6.II.2020 —m. 1300–1500 / Lgt. N. Mohagan—coll. M. Bollino, (all in MBLI) .

All paratypes with additional red card: PARATYPE / Pachyrhynchus yoshitakei / BOLLINO & RUKMANE, 2020.

Diagnosis. Pachyrhynchus yoshitakei belongs to the Pachyrhynchus amabilis species group (see taxonomical notes below), and differs from all other species of the group by its elytral ornamentation.

Description. Male. Dimensions: LB: 8.85–10.05 (holotype 10.05; â: 9.7). LR: 1.6–1.8 (1.8; 1.7). WR: 1.45–1.6 (1.5; 1.5). LP: 2.9–3.5 (3.25; 3.2). WP: 2.95–3.5 (3.2; 3.2). LE: 5.7–6.5 (6.4; 6.25). WE: 4.1–4.5 (4.5; 4.3). N= 6 specimens.

Integument of head and pronotum dark glowing red; antennae and tarsi slightly darker; integument of elytra glowing bottle green. Body surface mostly strongly shiny, except elytra subopaque and underside with weaker luster. Body mostly subglabrous, with slightly pinkish yellow glossy markings of round to elliptic recumbent scales. Head sparsely very minutely pubescent, with narrow elliptic scaly patch along midline; each side of rostrum densely covered with elongated to short hair-like scales on lateroventral part behind antennal scrobe, and covered with pinkish yellow linear scales and golden long hair-like scales on lateral part in front of scrobe. Elytra slightly pubescent, with small whitish hairs scattered along the parasutural area and the apex.

Prothorax with the following five scaly markings: 1) broad transverse band along basal margin, with a small median denticulation, 2) broad lateroventral stripe on each side, 3) a pair of transverse lateral patches along basal margin, 4) a pair of small circular scaly patches on both sides of middle of pronotum and 5) thin transverse band along apical margin.

Each elytron with the following six scaly markings: 1) small subbasal spot on interval III, 2) antimedian transverse band on entire width, 3) small postmedian spot on interval V, 4) long wide strip extending on interval III from behind the middle to just before the apex, turning slightly forward towards the outer edge, and joining with the streak of the outer margin, 5) postmedian round patch on interval VII, 6) long strip along postmedian outer margin joined with marking #4.

Fore femora with some fine hairs, and light-colored elliptic to hair-like scales along proximal anterior margin; scales become sparse and minute medially. Mid and hind femora covered with similar scales to those on front pair along proximal posterior margins. Tibiae fringed with long hairs along internal margins, sparsely mingled with stout hairs. Prosternum mostly covered with dense general scales; intercoxal part of mesosternum entirely densely covered with general scales; metasternum mostly covered with general scales, which become denser on sides; ventrite 1 with a pair of large lateral patches of general scales along apical margin. Head moderately minutely punctured.

Forehead flattish, nearly three times as wide as eye width; eyes relatively large, strongly prominent from outline of head; outline of each eye highest behind middle.

Rostrum slightly longer than wide (LR/WR 1.15–1.2); dorsum moderately finely punctured, with deep obtriangular concavity on basal half, weakly bulging on apical half; apical bulge dorsally flattish, with shallow indistinct sulcus along midline from apical half to 1/4; dorsal contour of forehead and rostrum separated by shallow, wide, ill-defined transverse furrow; dorsal contour of rostrum weakly arched in basal half, then gradually raised at apical half, and finally gradually declined to apex; sides slightly widened apically; ventral surface simple, not convex along midline.

Antennae with scape slender, nearly as long as funicle, moderately clavate; funicular segments I–II less than twice as long as wide; segments III–VII subequal in length, nearly as long as wide; club subovoid, nearly twice as long as wide.

Prothorax subspherical, nearly as long as or barely longer than wide (WP/LP 0.98–1.02); dorsum smooth, moderately finely punctured, weakly convex; dorsal contour highest at middle; sides gently dilated from moderately constricted base, widest at middle, then gently convergent apicad, and finally slightly constricted behind apex; basal and apical margins subtruncate; subbasal and subapical grooves entirely distinct.

Elytra subobovoid (LE/WE 1.38–1.48), moderately wider than prothorax (WE/WP 1.36–1.45), about one and three quarters as long as prothorax (LE/LP 1.70–1.88), weakly striate-punctured, with intervals evenly flattish; dorsum moderately convex; dorsal contour highest at middle; sides weakly, gradually dilated from base, widest slightly before middle, then gently narrowed to weak subapical constrictions, and finally gently rounded at apices. Metasternum flat on disc. Ventrite 1 widely depressed on disc; apex of discal depression reaching apical margin of ventrite 1. Ventrite 5 widely truncate at apex. Legs slender; femora rather strongly clavate; tibiae weakly incurved apically, sharply minutely serrate along internal margins, mucronate at apices; tibial mucrones vestigial on hind legs.

Genitalia as illustrated ( Fig. 2 A–E).

Female ( Figs. 1 C–D). Dimensions: LB: 10.5–13.2 (â: 11.8). LR: 1.6–2.1 (1.9). WR: 1.6–2.05 (1.8). LP: 3.2–4.1 (3.6). WP: 3.3–4.05 (3.6). LE: 7.2–8.6 (7.9). WE: 5.3–6.4 (5.8). N= 6 specimens.

Elytra more strongly convex dorsally, much wider than prothorax (WE/WP 1.58–1.63), with stronger subapical constrictions, elongate apically, and more acutely rounded at apices. Ventrite 1 flattish or slightly inflated on disc. Ventrite 5 very widely depressed along lateral margins, with adpressed light hairs turned apically. Otherwise, essentially as in males.

Genitalia: since female genitalia are of little or no use in identifying and characterizing the different species of Pachyrhynchini ( Bollino et al., 2020) , we do not illustrate them.

Notes on variability. The series is fairly stable as far as the pattern is concerned. The only slight variation is observed in the freshest specimens, in which the bottle green color of the elytral integuments is lighter and brighter.

Etymology. The new species is dedicated to Hiraku Yoshitake (Tsukuba, Japan) for his contribution to a better knowledge of both the taxonomy and systematics of Pachyrhynchini .

Distribution. As far as we know, the new species is endemic to the Malindang Mountain Range. The mossy forest prevails in the area where it was collected.

Figures

FIGURE 1. Pachyrhynchus yoshitakei sp. nov. Holotype.A: dorsal view; B: idem, lateral view; Pachyrhynchus yoshitakei sp. nov. female. C: dorsal view; D: idem, lateral view.

FIGURE 2. Male genitalia of Pachyrhynchus yoshitakei sp. nov. A: penis in lateral view; B: idem in dorsal view; C: sternite IX in dorsal view; D: endophallus in lateral view; E: idem in ventral view. Male genitalia of Pachyrhynchus imitans sp. nov. F: penis in lateral view; G: idem in dorsal view; H: sternite IX in dorsal view; I: endophallus in lateral view; L: idem in ventral view.