Pachyrhynchus sagittatus, Rukmane, 2019

Rukmane, Anita, 2019, Four new species and two subspecies of the genus Pachyrhynchus Germar, 1824 (Coleoptera: Curculionidae: Pachyrhynchini) from Luzon Island, Philippines, Baltic Journal of Coleopterology 19 (2), pp. 141-150 : 142-143

Pachyrhynchus sagittatus sp. nov.

Fig. 1C , 4 J-K.

Type material. Holotype. Male. ‘’ PHILIPPINES / Luzon, Sierra Madre , Quirino / V. 2015 / local collector leg.’’ (white rectangular label, printed) ; ‘’ HOLOTYPE / Male / Pachyrhynchus sagittatus / Rukmane, 2019 / det. Rukmane A. 2019’’ (red rectangular label, printed).

Distribution: Luzon Island, Quirino Province.

Description. Dimensions (holotype): LB: 12.1; LE: 7.7; WE: 5.5; LP: 4.1; WP: 4.0; LR: 1.9; WR: 1.8.

Integument coperry red, body strongly shiny, underside with weaker luster; body with markings of pale green round to recumbent scales. Dorsal habitus as shown in Fig. 1C .

Rostrum longer than wide (LR/WR 1.06), pubescent, finely punctured, bulging on apical part, with peak slightly before middle, deep triangular impression on basal half, longitudinal groove from midline to base of forehead, shallow transverse grow at base of forehead; forehead with lanceolate patch of scales medially, strongly wrinkled, nearly two times as wide as eye; lateral parts of rostrum covered with round to oval scales and hair-like scales, most intense along genae; few white hairs before antennal scrobes and long light hairs after antennal scrobes, with longer hairs near apex; antennomers evenly covered with long light hairs, scape covered with pubescence on basal part and long light hairs on apical part; pedicel 1.5 times as long as first antennomer, lon ger th an wide, an ten n omer s II-V subsphereical, sub equal in length. Head glabrous, finely punctured; eyes small, slightly prominent from outline of the head.

Prothorax subspherical, nearly same length as width (LP/WP 1.03), widest just in the middle; weakly punctured; dorsal contour slightly incurved at apical 1/3, gradually increased to middle, rounded, gradually decreased to subbasal part, straightened to base; with the following markings of pale green scales: 1) arrow-shaped patch medially on disc from subbasal part to slightly after midline; 2) two small spots on disc medially, each redirected laterally; 3) subovate shape patch on each latero-ventral part.

Legs stout; coxa with pale green roundish scales and hair-like scales; femur with short light hairs on basal part, pubescent in all length and with round pale green scales on apical part; tarsus with long, rare, golden setae.

Elytra sub ovate (LE/WE 1.4), intervals slightly pronounced, nearly smooth; each elytron with the following markings: 1) elongated patch at subbasal part along interval III and one along lateral margin; 2) transverse medial stripe from one lateral margin to other, stipe interrupted at interval V and VII forming small round spot; 3) longitudinal line from apical ½ to apex along interval III; 4) longitudinal line along lateral margin from apical 1/3 to basal 1/2; widest just in the middle; on dorsal dimension narrow at the base, gradually increased to middle, widest just in the middle, rounded and gradually decreased to apex up to apical ½, narrowed more strongly in direction to apex; apex sharpened, with weak pubescence.

Elytra wider than prothorax (WE/WP 1.38), nearly twice as long as prothorax (LE/LP 1.88). Aedeagus as shown in Fig. 4 J-K.

Female. Unknown.

Differential analyses. This new species according to its body characteristics and scaly markings on the body is unique enough to be different from any other known species of the genus Pachyrhynchus that comes from the Luzon Island. Nerveless, P. sagittatus sp. nov. is similar to newly described P. kirklayroni sp. nov., but differs by the following characters: 1) Prothorax of P. kirklayroni sp. nov. wider, more strongly rounded, dorsal contour at apical ½ without depression; 2) rostrum of P. kirklayroni sp. nov. wider, with weaker depression on basal part; 3) elytra of P. sagittatus sp. nov. shorter, with unique scaly markings; 4) male aedeagus of different shape.

Etymology. This species was named based on its typical marking on the pronotum – arrow shape spot dorsally on disc. Latin word of the arrow is sagitta.

Figures

Fig. 1. Dorsal habitus of the following species: A – P. tetramaculatus sp. nov. male; B – P. tetramaculatus sp. nov. female; C – P.sagittatus sp. nov. male; D – P. kirklayroni sp. nov. male; P. congestus ssp. aedamlayroni subsp. nov. male; E - P.congestus ssp. aedamlayroni subsp. nov female

Fig. 4. A, C, H, J, L – aedeagus in lateral view; B, D, I, K, M – aedeagus in ventral view; A, B – P.disargus sp. nov.; C, D – P.congestus ssp. aedamlayroni subsp. nov.; H, I – P.kirklayroni sp. nov.; J, K – P.sagittatus sp. nov.; L, M – P.tetramaculatus sp.nov.; E, F, G – female genitalia of P.phaleratus ssp. dannylayroni subsp. nov.; E – sternite VIII in ventral view; F – ovipositor in dorsal view; G – spermatheca. Scale bar 1.00 mm