Pachyrhynchus occidentalis, Rukmane, 2017

Rukmane, Anita, 2017, New Species Of The Genus Pachyrhynchus Germar (Coleoptera, Curculionidae, Entiminae) From The Greater Mindanao Pleistocene Aggregate Island Complex (Philippines), Acta Biologica Universitatis Daugavpiliensis 17 (1), pp. 85-95 : 91-93

Pachyrhynchus occidentalis sp. Nov.

( Figs. 1A, B ; 5 , 6 , 7 )

Type material. Holotype: Male ( DUBC) ‘’ PHILIPPINES, Mindanao Island, Davao Del Sur, Kapatagan , IX. 2016, / local collector leg. /’’ (typed on white card); ‘’ex. Prof. A. Barševskis coll.’’ (typed on white card) ; ‘’ HOLOTYPE / Male / Pachyrhynchus occidentalis / Rukmane 2017 / det. Rukmane Anita, 2017’’ (typed on red card). Paratypes: 7 males and 6 females from Mindanao Island, Cotabato, Mt. Parker ( IV. 2014 (2); VI. 2014; VII. 2014; VIII. 2014 (3); IX. 2014 (5)) ; 2 males from Mindanao Island , Sarrangani, Kiamba ( XII. 2015 (2)) ; 1 male from Mindanao Island, Mt. Apo ( VIII. 2013) . All in DUBC .

Distribution: Philippines, Mindanao Island, Western part ( Fig. 7 ).

Description. M a l e. Dimensions: LB: 13.95- 15.95 (holotype 14.35; mean 14.62); LR: 1.5-1.75 (holotype 1.7; mean 1.64); WR: 1.7-1.95 (holotype 1.95; mean 1.84); LP: 3.05-3.75 (holotype 3.5; mean 3.32); WP: 3.45-4.15 (holotype 3.95; mean 3.87); LE: 8.45-9.3 (holotype 8.95; mean 8.94); WE: 4.95-5.45 (holotype 5.35; mean 5.17). N = 11 for all measurements.

Integument glowing red, with strong luster, in some paratypes coppery, antennae and mandibles darker.

Body with nacreous pale green to yellow markings of round recumbent scales.

Head glabrous, minutely punctured, forehead slightly impressed among midline, with linear line of scales from apex to basal half of rostrum, line narrows closer to rostrum. Eyes large, prominent from lateral contour of head; each eye highest at middle. Antennal scape shorter than funicle, moderately clavate, with long light hairs at distal side; funicle with segment I more than twice as long as wide, 1.4 times as long as II; segment II 1.25 times longer than wide, 1.3 times as long as III; segments III-VI equal in length, nearly as long as wide, slightly narrower than VII; segment VII nearly twice as longas wide, well furnished with short brown hairs.

Rostrum subglabrous, except with few general scales on basal half; lateroventral parts just behind antennal scrobes with irregular scaly patch on each side; patch fringed with hair-like scales along margins; long golden hairs near apex. Rostrum wider than long, WR/LR 1.15. Dorsum well punctured, with triangular concavity on basal half, bulging apically; apical bulge dorsally flatish; dorsal contour of forehead and rostrum convergent, narrow near eyes, bulging apically with peak at basal 1/3, concavity before antennal scapes and weak bulge at apical part with peak at apical 3/4; ventral surface weakly convex along midline.

Prothorax subspherical, wider than long, WP/ LP 1.13; weak convex near base; with the following three scaly markings: 1) transverse confluent line of scales at disc; 2) transverse convergent line of scales close to anterior angle, at anteriolateral angles line reach apical margin, at central part line is closer to disc with triangular peak almost reaching anterion margin in middle; 3) band of scales at lateral base, which connect both lines and circumscribes long oval shape. Dorsal contour confluent high from middle to basal 2/3, then narrow and gradually extends to basal margin.

Each elytron subglabrous, finely punctured, intervals smooth, well pronounced; almost no hairs near apex and at apical half; Following markings of scales: 1) transverse suboval figure circumscribed by a narrow scale band in basal third, reaching from interval I to lateral margin; 2) two narrow convergent parallel transverse lines confluent at margin with a marginal stripe in the middle, latter of which circumscribes in apical third a triangular figure. LE /WE 1.67, WE/WP 1.35, LE / LP 2.56. Dorsal contour highest before middle, gradually narrowed to apices.

Coxae minutely pubescent, mingled with short golden hair-like scales; fore coxae densely covered with general scales on anterior parts. Femora weakly covered with small pubescence and hair-like scales; oval patch of scales; oval scaly patch on subapical part except anterior margin, rather densely covered with long golden green hairs and hair-like scales on basal half among posterior margin. Tibiae partially furnished with light hairs which become longer apically at interomarginal parts.

Genitalia as illustrated in Fig. 5 . Aedegal body stretched out, in lateral view sharply curved ventrally at the bazal fifth, and gradually attenuated in the apical part, apex with angle-shaped, rounded ventral margin, curvature raised dorsally and sharply incurved ventrally at middle; two prominent bulges near base of ostium, on lateral view bulge pyramidal. In frontal vision moderately even all along.

F e m a l e. Dimensions: LB: 14.7-16.45 (holotype 16.25; mean 15.7; LR: 1.65-1.8 (holotype 1.7; mean 1.73); WR: 1.7-1.9 (holotype 1.9; mean 1.8); LP: 3.05-3.4 (holotype 3.3; mean 3.2); WP: 3.3-3.9 (holotype 3.9; mean 3.67); LE: 9.35-11.75 (holotype 11.75; mean 10.29); WE: 6.05-6.45 (holotype 6.35; mean 6.22). N = 6 for all measurements.

Rostrum WR/LR 1.04. Prothorax WP/ LP 1.15; Elytra LE /WE 1.65, WE/WP 1.69; LE / LP 3.22.

Diagnosis. Pachyrhynchus occidentalis sp. nov. is similar to members of ‘’absurdus’’ group. Species specific characters: 1) shape of male genitalia ( Fig. 5 ); 2) slender elytra with most stretched out apex; 3) eyes bigger, closer to margin; other specific characters visible from lateral view ( Fig. 6C ).

Etymology. Pachyrhynchus occidentalis sp. nov. is called based on it’s distribution which is Western part of Mindanao Island. Western – occidental.

Figures

Fig. 1. Dorsal habitus of A- P. occidentalis, male; B – female; C – P. ilgas, male; D – P. orientalis, male; E – female; F – P. neoabsurdus, female.

Fig. 5.Aedegal body of P.occidentalis; A – lateral view; B – frontal view. Scale 1mm.

Fig. 6. Lateral view of habitus; A – P. absurdus; B – P. orientalis; C – P. occidentalis; D – P. neoabsurdus. All females.

Fig. 7. Distribution map of Pachyrhynchus ‘’absurdus’’ group.