Pachyrhynchus imitans, 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 : 328-331

Pachyrhynchus imitans sp. nov. Rukmane & Bollino

( Fig. 4 A–D)

urn:lsid:zoobank.org:act:6197CA4A-A6BC-4A96-B9B1-CBF9DDED913B

Type material. Holotype, male ( Fig.4 A–B): Philippines—Mindanao / Labuan (Zamboanga City ) / October–No-vember 2014 / ex. N. Mohagan—coll. Bollino (typed on white card) // HOLOTYPE male / Pachyrhynchus imitans / RUKMANE & BOLLINO, 2020 (typed on red card), presently in MBLI, will be deposited in SMTD .

Paratypes (12♂♂, 19♀♀): 1♂ PHILIPPINES / Mindanao, Zamboanga, Siocon / IV. 2019 / local collector leg .; 1♂ PHILIPPINES / Mindanao, Zamboanga, Siocon / II. 2019 / local collector leg .; 1♀ PHILIPPINES / Mindanao, Zamboanga, Labuan / II. 2018 / local collector leg .; 1♀ PHILIPPINES / Mindanao, Zamboanga / Sandayong / XII. 2018 / local collector leg .; 2♀ PHILIPPINES / Mindanao, Mt. Gampoy / II. 2016 / local collector leg .; 1♀ PHILIPPINES / Mindanao, Zamboanga, Mt. / Gampoy , 600–1200m / I. 2016 / local collector leg .; 2♂♂, 1♀ PHILIPPINES, Mindanao / Zamboanga del. Norte / Gutalac. VIII. 2014 / local collector leg .; 1♀ PHILIPPINES, Mindanao / Zamboanga del. Norte / Gutalac. I. 2015 / local collector leg. (all in DUBC) ; 1♂ Philippines: / Mindanao / Zamboanga del Norte / Gutalac V . 2019 / via. I. Lumawig (in MZZC) ; 3♂♂, 5♀♀ same data as Holotype ; 2♂♂, 3♀♀ Philip-pines—Mindanao Is. / Tampilisan / (Zamboanga del Norte) / XI.2014 / ex Noel Mohagan—coll. Bollino ; 2♂♂, 4♀♀ Philippines—Mindanao / Gutalac (Zamboanga) / September 2014 / ex I. Lumawig—coll. M. Bollino; (all in MBLI) .

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

Diagnosis. Pachyrhynchus imitans sp. nov. belongs to the Pachyrhynchus amabilis species group, but can be easily distinguished from P. zamboanganus for its glowing red body with darker, coppery to nearly black elytra instead of black integuments with bluish tinge, and similar species P. amabilis Schultze, 1922 and P. pseudoamabilis Yoshitake, 2012 for its elytral markings combined with the trilobed basal medio-ventral diverticulum of the endophallus instead of bilobed diverticulum.

Description. Male. Dimensions: LB: 9.3–10.1 (holotype 9.8; â: 9.7). LR: 1.8–1.9 (1.9; 1.8). WR: 1.5–1.6 (1.6; 1.5). LP: 2.7–3.1 (3.1; 2.9). WP: 2.9–3.2 (3.2; 3.0). LE: 6.2–6.6 (6.4; 6.4). WE: 3.8–4.7 (4.3; 4.1). N= 4 specimens.

Head, pronotum, femur and tibia dark glowing red; antennae and tarsi nearly black; integument of elytra dark coppery with green to reddish tinge. Body surface strongly shiny, except underside of elytra with weaker luster. Body with dark orange scaly markings of subovate recumbent scales. Head minutely pubescent, finely punctured throughout length, without scaly markings; lateroventral parts of the rostrum before and behind antennal scrobe covered with long hair-like scales, with very few elongated scales before it.

Prothorax mostly glabrous dorsally, with the following three scaly markings: 1) a transverse band along basal margin, slightly protruding apically in middle, 2) a broad lateroventral stripe on each side that partially extends along the basal margin, and 3) a broad transverse band along apical margin.

Each elytron subglabrous with two large scaly patches, one on basal half and another on apical half; basal patch obliquely depressed obovate, extending from suture to external margin of elytron, gradually widened toward elytral margin; apical patch subtriangular, extending from interval II to external margin of elytron, with basal margin arched posteriorly.

Femora and tibiae subglabrous, the latter fringed with long hairs along internal margins, sparsely mingled with stout hairs. Prosternum and mesosternum mostly without scales, metasternum connected with transverse band of elytra, forming additional triangular patch on lateral sides. Ventrite 1 with few roundish scales along apical margin.

Head sparsely punctured. Forehead flattish dorsally, slightly bulging near median edge of the eyes, nearly twice as wide as eye width; eyes large, bulging from outline of the head, with highest point just behind the middle.

Rostrum slightly longer than wide (LR/WR 1.19–1.2); dorsum finely punctured, with deep triangular impression on basal part, bulging on apical part, with deep longitudinal medial groove from apical half to base of the forehead; dorsal contour of rostrum arched at basal half just before the middle, then raised up to apical half and straightened to apex.

Scape densely covered with long golden hairs from just before the middle to the apex along outer margin. Antennal funicular segments I and II sub-equal in length, 1.5 times as long as wide; segments III–V subequal in length, slightly wider than long; segments VI–VII subequal, slightly larger than segments III–V; club suboval, more than twice as long as wide.

Prothorax subspherical, nearly as long as wide (WP/LP 1.03–1.07); dorsum smooth, weakly punctured on apical half, moderately convex; dorsal contour highest slightly before the middle.

Elytra subovate (LE/WE 1.4–1.63), wider than prothorax (WE/WP 1.31–1.47), more than twice length of prothorax (LE/LP 2.13–2.29), with smooth surface; intervals only marked by punctures; dorsal contour widest just at the middle.

Genitalia as illustrated ( Figs. 2 F–L).

Female ( Figs. 4 C–D). Dimensions: LB: 10.4–11.7 (â: 11.2). LR: 1.8–2.0 (1.9). WR: 1.5–1.7 (1.6). LP: 2.9–3.4 (3.2). WP: 3.1 –3.5 (3.4). LE: 7.2–7.7 (7.4). WE: 5.1–5.4 (5.2). N= 6 specimens.

Slightly larger than males (â LB ♂ /â LB ♀: 0.86), with more convex and wider elytra ( LE / WE 1.41 – 1.43 ). Otherwise, essentially as in males .

Notes on variability. The typical series is fairly stable as far as the pattern is concerned. The only obvious variation concerns the color of the elytral integument, which tends to become black in the old specimens.

Etymology. The new species is named imitans (Latin imitans = imitating) for its resemblance to other Pachyrhynchus species of the amabilis species group, i.e., P. zamboanganus , amabilis and pseudoamabilis .

Distribution. To the best of our knowledge the new species is restricted to Zamboanga Peninsula, where it appears to have scattered and low-density populations.

Taxonomical notes. Pachyrhynchus yoshitakei sp. nov. and Pachyrhynchus imitans sp. nov. belong to the Pachyrhynchus amabilis species group introduced by Bollino et al. (2017) because they share the same combination of morphological characters:

1) integument dark glowing red, with more-or-less marked green tinge.

2) eyes strongly convex from outline of head.

3) prothorax subspherical, with sides straightly dilated from constricted base.

4) prothorax with a scale band along anterior margin and another along posterior margin united at lateral margins, the latter discally somewhat denticulated.

5) endophallus having the same shape, with basal medio-ventral diverticulum bilobed in most species, but trilobed in two species (see below).

The updated list of species assigned to the Pachyrhynchus amabilis species group, indicated in order of the year of description, is as follows:

Pachyrhynchus amabilis Schultze, 1922

Type locality: Mindanao Isl. , Prov. Bukidnon, Lindaban. Type in SMTD .

Pachyrhynchus chamissoi Schultze, 1922

Type locality: Mindanao Isl. , Prov. Bukidnon, Lindaban. Type in SMTD .

Pachyrhynchus pseudamabilis Yoshitake, 2012

Type locality: Philippines, Mindanao Isl. , Mt. Apo. Type in NIAES .

Pachyrhynchus subamabilis Yoshitake, 2012

Type locality: Mt. Apo , S. Mindanao Isl., Philippines. Type in NIAES .

Pachyrhynchus zamboanganus Yoshitake, 2012

Type locality: Philippines, West Mindanao Isl. , Zamboanga del Norte Province. Type in NIAES. Pachyrhynchus tikoi Rukmane, 2016

Type locality: Philippines, Mindanao Isl. , Bukidnon, Cabanglasan. Type in DUBC .

Pachyrhynchus banglas Bollino, Sandel & Rukmane, 2017

Type locality: Philippines, Mindanao Isl., Bukidnon, Kabanglasan , Type in SMTD

Pachyrhynchus yoshitakei Bollino & Rukmane , hoc opus

Type locality: Philippines, Mindanao Isl, Mt. Capole, Sebucal , Mt. Malindang Range , Misamis Occidental. Type in SMTD

Pachyrhynchus imitans Rukmane & Bollino , hoc opus

Type locality: Philippines, Mindanao Isl., Labuan , Zamboanga City. Type in SMTD

We take advantage of the opportunity to correct an identification error committed by us ( Bollino et al. 2017): the specimen identified as Pachyrhynchus zamboanganus Yoshitake, 2012 (op. cit.: figs. 5g, 6g, 9f) does not belong to this taxon, but to Pachyrhynchus imitans described here above. We therefore illustrate here the true P. zamboanganus (fig. 3A) and its endophallus (figs. 3B–C). Pachyrhynchus zamboanganus and P. imitans sp. nov. are very similar to each other in having the basal medio-ventral diverticulum of the endophallus trilobed rather than bilobed, thus the considerations made by Bollino et al. (2017: 192) apply to both.

Figures

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.

FIGURE 4. Pachyrhynchus imitans sp. nov. Holotype.A: dorsal view; B: idem, lateral view; Pachyrhynchus imitans sp. nov. female. C: dorsal view; D: idem, lateral view.