Filipinorhynchus engkanto Cabras, Obrial and Agbas, 2025

Cabras, Analyn A., Agbas, Daven Jayson D. & Obrial, Graden G., 2025, Filipinorhynchus Cabras gen. nov., with two new species (Coleoptera, Curculionidae, Entiminae, Pachyrhynchini) from Davao de Oro, Mindanao Island, Philippines, Zootaxa 5642 (2), pp. 163-177 : 168-171

Filipinorhynchus engkanto Cabras, Obrial and Agbas , sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:D4F3C81A-FF08-4FBC-ADBF-FFCEEFB14C67

Figure 1 A–F , Figure 4 A–D

Holotype ( Fig 1. A–C ), male: Philippines — Mindanao Island, Davao de Oro, Maragusan, Mt. Candalaga / June 9, 2024 / leg. D. Agbas & G. Obrial (typed on white card) // HOLOTYPE male / Filipinorhynchus engkanto / Cabras, Obrial & Agbas, 2024 (typed on red card)” ( PNM) . Paratypes (1 male, 3 females); 1 female: same data as holotype/ leg. D. Agbas & G. Obrial ; 1 male, 1 female: same data as holotype/ leg. E. Avergonzado & J. Japitan ; 1 female: same data as holotype but August 24, 2024 / leg. D. Agbas & G. Obrial (typed on white card, all Paratypes with additional yellow labels) . (1 male, 1 female: deposited at DGC. 1 female: deposited at CMNC. 1 female: deposited at SMTD) .

Diagnosis. Filipinorhynchus engkanto is easily distinguished from F. diwata by the following chracteristics: rostrum with more pronounced V-shaped ridge forming a subtriangular depression at middle from basal 3rd, gradually raised up to apical 1/3rd. Apical half elevated at distal margins and with a shallow depression at dorsum. Prothorax, subglobular with sparse, fine punctures and sparse, minute setae on distal surface, lateral surface coarsely punctured, each puncture with recumbent-suberect setae (compared to F. diwata with a subrectangular prothorax, weakly rugopunctate on distal surface and coarsely rugopunctate on lateral surface). Elytra with rounded apex ( F. diwata with tapered apex). Elyta and pronotum with few to no white scaly markings along lateral margin (in contrast to F. diwata with much more elaborate maculations along lateral margin) ( Fig. 1. B ; Fig. 3. B ). Aedeagus of F. engkanto , ventrally slightly constricted at base; ventral margin in lateral view abruptly raised from basal 3 rd up to apical 1/3 rd and gradually raised apically with a curved apical protrusion that is blunt at apex at dorsal margin, laterally. Margin of aedeagal orifice in lateral view, not uniformly curved ( Fig. 4. A–C ).

Description. Male.

Dimensions: LB: 12.0 mm–14.0 mm (Holotype: 14.0 mm). LR: 2.1 mm – 2.5 mm (Holotype: 2.5 mm). WR: 2.0 mm (Holotype: 2.0 mm). LP: 3.8 mm – 4.5 mm (Holotype 4.5 mm). WP: 4.0 mm–5.0 mm (Holotype: 5.0 mm). LE: 8.0 mm– 9.8 mm (Holotype: 9.8 mm). WE: 5.0 mm–6.0 mm (Holotype: 6.0 mm). N=2

Integument black; body surface, rostrum, head, legs, and underside matte.

Head with dorsal surface moderately convex, rugopunctate with very fine setae; lateral side below eyes rugose, with thinly elliptical appressed contiguous white scales interspersed with white appressed piliform scales and subappressed setae; eyes medium-sized, weakly convex and moderately prominent on outline of head.

Rostrum finely punctate in basal half and coarsely punctate in apical half; most punctures with subappressed fine setae; longer than wide (LR/WR: 2.5mm /2.0mm); with prominent transverse groove separating head and rostrum; base constricted with prominently raised V-shape ridges, basal half with subtriangular depression and median furrow; apical half elevated especially distal margins with shallow depression on dorsum; in lateral view constricted at middle, widened apically, lateral sides below antennal scrobe with suberect setae which are longer anteriorly; dorsolateral margin rounded. Antennal scape as long as funicle, scape reaching anterior margin of eye, flattish, expanded apically with sparse suberect setae; funicle also with suberect setae. Funicular segment I and II subequal in length, approximately 1.5X longer than wide, segment III to VI as long as wide, shorter than I and II, segment VII significantly wider than I–VI, wider than long, nearly as long as III and VI, covered in dense setae; club ellipsoidal.

Prothorax subglobular, truncate at posterior margin, wider at posterior margin than anterior margin, slightly wider than long (LP/WP: 4.5mm /5.0mm), punctate on dorsal surface, rugopunctate on lateral sides, covered with short subappressed setae; lateral contour in dorsal view weakly arcuate, widest at middle; dorsal contour in lateral view nearly flat.

Elytra long and narrow lanceolate-ovate with furrowed striae (LE/WE: 9.8mm /6.0mm), 1.6x longer than wide, 2.5X longer than prothorax and moderately wider than prothorax (WE/ WP: 6.0mm/5.0mm, LE/LP: 9.8mm / 4.5mm), striate punctate, punctures large and closely arranged forming distinct furrows, dorsum densely covered with erect setae from base to apex, lateral contour in dorsal view weakly arched, widest before middle. Apex rounded.

Legs with moderately clavate femora; femora black covered with minute punctures and setae; apical third of femora with declivity filled with dense clump of setae. All pairs of tibiae flattened, and serrate along inner margins with sparse suberect setae, inner sides coarsely punctured or with granules; tibiae with mucro at apex. Tarsomeres pubescent. Protarsomere 1 and 2 subtriangular and subequal in length and width; mesotarsomere 1, and metatarsomere 1 subequal, longer than protarsomere 1 and meso and metatarsomere 2, subtriangular; tarsomere 2 short, triangular, simple; tarsomere 3 bilobed, slightly longer and significantly wider than tarsomeres 1 and 2; tarsomere 5 significantly longer than tarsomere 1; tarsal claws simple and free. Coxae with sparse punctures and short setae.

Venter with mesoventrite punctate, with sparse setae. Metaventrite rugo-punctate with short setae, weakly depressed on disc posteriorly. Ventrite I with deep depression at middle of disc, rugopunctate with sparse setae; ventrites II to V flat, punctate with short setae in each puncture; ventrite V flat, truncate apically with short vibrissae.

Male genitalia and sternite IX as shown in Figure 4 A–D .

Female. Dimensions: LB: 15.2 mm –17.0 mm. LR: 2.5 mm – 2.6 mm. WR: 2.0 mm– 2.1 mm. LP: 3.8 mm – 4.2 mm. WP: 3.4 mm –5.0 mm. LE: 11.0 mm– 12.1 mm. WE: 6.5 mm – 7.3 mm. N=3.

Habitus as shown in Figure 1 D–F .

Females ( Figure 1 D–F ) differ from males in the following characteristics: a) lateral side of rostrum with small pitlike depression, b) elytra longer and wider (LE/WE 12.1mm / 7.3mm, WE/WP 7.3mm /5.0mm, LE/LP 12.1mm / 4.2mm) than male; c) lateral contour of elytra more arched, interrupted subapically, d) dorsal contour of elytra more flattish and apical declivity more abrupt; e) apex of elytra acute and not rounded like the male, f) Ventrites I–V more smooth, less punctured and rugose, g) Ventrites 1 and 2 convex; h) presence of small white streaks of scales on lateral margin of elytra and each side of posterior margin of Ventrite I. Otherwise, females are similar to the male.

Distribution. Filipinorhynchus engkanto is known so far from the type locality in Mount Candalaga, Maragusan, Davao de Oro.

Etymology. The name “ engkanto ” is a noun in apposition, derived from the mythical environmental spirits living in the densely forested mountains of the Philippines and who can create an enchanting phenomenon among hikers or anyone who ventures into the forest. Originally, it is from the Spanish word " Encanto “ which means enchantment, again depicting the enchanting environment in the higher elevation of Mount Candalaga where the new species was collected.

Figures

FIGURE 1. Filipinorhynchus engkanto. A—male holotype, dorsal view. B—idem, lateral view. C—idem, ventral view. D— female paratype, dorsal view. E—idem, lateral view. F—idem, ventral view. Scale: 1 cm.

FIGURE 3. Filipinorhynchus diwata. A—male holotype, dorsal view. B—idem, lateral view. C—idem, ventral view. D— female paratype, dorsal view. E—idem, lateral view. F—idem, ventral view. Scale: 1 cm.

FIGURE 4. Aedeagus and sternite IX of Filipinorhynchus. A–D F. engkanto A—aedeagus, in lateral view. B—idem, ventral view. C—idem, dorsal view. D—sternite IX. E–H F. diwata E—aedeagus, in lateral view. F—idem, ventral view. G—idem, dorsal view. H—sternite IX. Scale: 1 mm.