Pachyrhynchus orientalis, 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 : 89-91

Pachyrhynchus orientalis sp. nov.

( Figs. 1D, E ; 3 , 4, 6B, 7)

Type material. Holotype: Male ( DUBC) ‘’ PHILIPPINES, Mindanao Island, Bukidnon, Cabanglasan , VII. 2014, / local collector leg. /’’ (typed on white card); ‘’ex. Prof. A. Barševskis coll.’’ (typed on white card) ; ‘’ HOLOTYPE / Male / Pachyrhynchus orientalis / Rukmane, 2017 / det. Rukmane Anita, 2017’’ (typed on red card). Paratypes: 5 males and 1 female from Mindanao Island, Bukidnon, Cabanglasan (VIII. 2013; I. 2014; VI. 2014; VII. 2014 (2)) , 2 males and 2 females from Mindanao Island, Surigao Del Sur, San Miguel (VIII. 2013, VI. 2014 (2), VIII. 2014). All in DUBC .

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

Description. M a l e. Dimensions: LB: 13.9- 15.7 (holotype 15.6; mean 15.09); LR: 1.6-1.8 (holotype 1.7; mean 1.73); WR: 1.5-1.8 (holotype 1.8; mean 1.7); LP: 3.3-3.95 (holotype 3.9; mean 3.73); WP: 3.95-4.8 (holotype 4.7; mean 4.47); LE: 8.8-10.2 (holotype 9.75; mean 9.49); WE: 5.4-6.25 (holotype 6.25; mean 6.0). N = 8 for all measurements. Dorsal habitus as shown in Fig. 1D .

Integument dark coppery red to brown, some paratypes almost black; antennae and mandibles darker. Body surface strongly shiny except underside which has a weaker luster.

Body with weak pubescence, with glossy nacreous green to goldish markings of recumbent round scales.

Head dorsally subglabrous, moderately finely punctured, with linear scaly patch along midline from vertex to middle of rostrum; lateroventral parts below eyes with irregular shape scaly patch. Forehead almost without depression along midline. Eyes relatively large, moderately prominent from lateral contour of head. Antennae short and stout, with scape a bit of shorter than funicle; funicle with segment I 1.8 times longer than wide, proximately same length as II; segment II 1.5 times as long as wide, 1.7 times as long as III; segments III-V subequal in length and width, slightly wider than long, narrower than VI; segment VI slightly wider than long, strongly narrower than VII; segment VII club subellipsoidal, 1.8 times as long as wide.

Rostrum minutely pubescent; lateroventral parts except antennal scrobes covered with round to oval nacreous green scales, densely furnished with long golden setae near apex. Rostrum slightly wider than long, WR/LR 1.06; Deep obcordate concavity on basal half, two strong bulges at each side on apical half; apical bulge with peak on middle of apical half, flattish dorsally; dorsal contour of rostrum flattish in basal half, with weak declining at median part, weakly raised from middle to apical third and gradually declined to apex; ventral surface convex along midline.

Prothorax with a two longitudinal scale stripes dorsally in the middle; Stripes convergent toward and confluent near anterior margin. Lateral margins circumscribed by scale stripes that in overall forms a large oval shaped figure; shape subspherical, wider than long, WP/ LP 1.21, widest at middle; subapical groove weak, almost entirely distinct; subbasal groove thick, expressed. Lateral contour: bulge in basal part which straighten up at basal 1/3, smooth to dorsal part with very weak bulge in subapical part.

Elytra subovate, LE /WE 1.56, two and half times longer than prothorax, LE / LP 2.5, moderately striate-punctured, intervals even; contour widest just before middle. Each elytron with long hairs, located on apical half; following scaly markings: 1) transverse oval figure circumscribed by a narrow scale band in basal third, reaching from interval I to lateral margin; 2) two narrow parallel transverse bands confluent at margin with a marginal stripe in the middle, latter of which circumscribes in apical third a triangular figure. Legs stout; femora strongly clavate; Coxae covered with general scales on anterior parts, mingled with short light brown hairs. Hind femora with oval patch of scales along posterior margins, mingled with rare short hairs. Tibiae sparsely pubescent, furnished with long dense hairs along internal margin. Tarsus and claws thickly furnished with long golden hairs.

Genitalia as illustrated in Fig. 3 . Sternite IX slender, nearly 1.4 times as long as aedegal body, strongly incurved leftward. Aedegal body stretched out, in lateral view moderately curved ventrally in the bazal third, and gradually attenuated in the apical part, apex with angle-shaped ventral margin, curvature raised dorsally and sharply incurved ventrally at middle, with pyramidal bulge at basal middle; two prominent bulges near base of ostium with pyramidal shape on lateral view. In frontal vision widest at base, narrowed at basal third and gradually extended at apical part. Aedegal apodemes slender, neatly 2.25 times shorter than aedegal body. Tegmen with slender apodeme, nearly twice as long as diameter of tegminal ring.

F e m a l e. Dimensions: LB: 15.3-16.2 (holotype 15.3; mean 15.87); LR: 1.45-1.6 (holotype 1.45; mean 1.53); WR: 1.9-2.05 (holotype 1.9; mean 1.95); LP: 3.75-4.2 (holotype 3.75; mean 4.02); WP: 4.1-4.85 (holotype 4.1; mean 4.57); LE: 9.5-9.5 (holotype 9.3; mean 9.43); WE: 6.85-7.0 (holotype 6.85; mean 6.92). Dorsal habitus as shown in Fig. 1E , lateral as shown in Fig. 6B. N = 3 for all measurements.

Rostrum much wider than in males WR/LR 1.30. Prothorax WP/ LP 1.1; Elytra LE /WE 1.36, WE/ WP 1.68, LE / LP 2.48.

Diagnosis. Pachyrhynchus orientalis sp. nov. according to scale pattern and shape of male genitalia is similar to all species from ‘’absurdus’’ group, but is easily distinguishable by specific characters: huge apical bulge on rostrum, thick subbasal groove on pronotum, bulge on basal part of pronotum, smaller interval between eyes, differences in male aedegal body ( Fig. 3 ), apical half or each elytron with intense short hairs.

Etymology. Pachyrhynchus orientalis sp. nov. is called based on it’s distribution which is northern part of Mindanao Island. Northern – oriental.

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. 3. Male genitalia of P. orientalis; A – aedegal body in lateral Fig. 4. Female genitalia of P. view; B – aedegal body in frontal view; C – sternite IX; D – tegmen. orientalis. Scale 1mm. Scale 1mm.

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

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