Filipinorhynchus Cabras, 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 : 164-167

Filipinorhynchus Cabras gen. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:80B40186-8D61-48EB-9744-EF42DAA2D87C

Figure 1 A–F , Figure 2 A–K

Type species: Filipinorhynchus engkanto Cabras, Obrial and Agbas sp. nov.

Diagnosis. The new genus shares similar morphological characteristics of generic importance with the genus Pachyrhynchus Germar, 1824 based on the following: rostrum dorsally bulging in apical half, simple antennal scrobes, scape not reaching posterior margin of eye, and metanepisternal suture entire ( Schultze, 1923). However, Filipinorhynchus clearly differs from Pachyrhynchus based on the combination of the following characteristics: dorsal contour of head and rostrum discontinuous in profile with the presence of a transverse groove, base of rostrum significantly narrower than forehead between eyes and with a narrow gap with the inner margins of eyes, rostrum constricted at base and widened posteriorly with a prominent V-shape ridge, dorsally with a shallow triangular concavity on basal half and shallow elliptical concavity on apical half (compared to Pachyrhynchus with head and rostrum continuous without presence of transverse groove, base of rostrum nearly equal to interocular distance of forehead, mostly flattish except for some members); upper margin of antennal scrobe carinate and almost contiguous with a faint suboblique groove directed towards the inner margin of eyes. Prothorax and elytra devoid of scales, rough, matte black; prothorax’ dorsal and lateral sides densely covered with very fine setae, central disc of pronotum with semi-erect to erect, lateral side adpressed; lateral side of prothorax (propleura) with fine wrinkles. Elytra finely wrinkled and striate punctate, fully covered with homogenously arranged and moderately long erect setae along striae, lanceolate-ovate, nearly 2.5X longer than pronotum with weakly convex to nearly flat dorsal contour and abrupt apical declivity for females ( Pachyrhynchus on the other hand with surface of prothorax and elytra shiny and smooth, elytra mostly without pubescence except for Pachyrhynchus postpubescens Shultze, 1922 , but only on posterior part of the elytra, dorsal contour weakly to strongly convex). Femora with a tuft of moderately long setae on the inner margin of apical third, all pairs of tibiae flattish and distinctly serrate with sparse granulations along the inner margin; suture between ventrite I and II entirely distinct, and procoxae moderately separated (in contrast to Pachyrhynchus with procoxae slightly separated with only foretibia serrate, with subconnate ventrites). Furthermore, similar to Pachyrhynchus , Filipinorhynchus is characterized by chaetotaxy of mandibles and prementum, and antennal scrobe complete.

Description. Body relatively large (length between 12.0 mm and 14.0 mm), covered with erect to suberect setae on all surfaces.

Head. Interocular width in dorsal view significantly wider than base of rostrum, central disc moderately convex, with very short median furrow.

Eyes circular, medium-sized, weakly convex, and moderately prominent on outline of head. Head and rostrum discontinuous in profile.

Rostrum longer than wide, rostrum sepparated from the head by a presence of faint transverse groove, base of rostrum significantly narrower than forehead between eyes, with narrow gap with inner margins of eyes, constricted at base, widened posteriorly with V-shaped ridge, dorsally with shallow triangular concavity on basal half and shallow elliptical concavity on apical half, in lateral view, dorsal contour slightly convex both on basal and apical half towards apex, weakly sinuate at middle; ventral contour strongly curved. Dorsolateral edge slanted. Presence of median furrow extended from middle of eyes towards middle of rostrum but deeper towards middle forming deep median groove. Antennal scrobe simple; in lateral view, defined and slightly widened posteriorly resulting in shallow triangular depression; strongly curved ventrad of head; upper margin of antennal scrobe carinate, almost contiguous with faint suboblique groove directed towards base of rostrum. Each mandible with 5-6 suberect setae. Prementum subspherical, subsided in oral cavity with 2 pairs of setae on each side. Postmentum depressed.

Antennae 11-segmented, covered in suberect setae. Antennal scape clavate, stout, reaching anterior margin of eyes, nearly as long as funicle, flattened on inner sides. Funicle 7 segmented and club 3 segmented, short, ellipsoidal.

Prothorax subglobular, posterior margin wider than anterior margin; dorsum with distinct punctures dorsally and rugae laterally, covered with short erect and suberect setae; in dorsal view, lateral contour weakly convex, widest point at middle; in lateral view, dorsal contour nearly flat; anterior and posterior margins with very short vibrassae along lateral and ventral sides.

Elytra narrowly lanceolate-ovate, rough and finely wrinkled, 3X longer than wide; dorsum punctate, covered in moderately long erect setae homogenously lined along intervals; dorsal contour flattish to very weakly convex with slightly abrupt apical declivity; lateral contour weakly arched, interrupted subapically; striae large and close to each other creating shallow and thin but defined furrows; intervals flat, punctured with setae; basal margin simple, apex rounded.

Femora clavate, profemora as long as tibiae, meso and metafemora longer than tibiae; mesofemora longest. Femora with subapical declivity along inner margins with clump of setae; profemora with most prominent declivity. Tibiae serrate along internal margins, granulate along inner sides; slightly flattened and weakly curved in apical third; mucronate on all tibiae but hind tibiae with shorter mucro. Tarsi moderately long with long subappressed setae. Protarsomere 1 and 2 subtriangular, 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, significantly wider than tarsomeres 1 and 2; tarsomere 5 significantly longer than tarsomere 1; tarsal claws simple and free.

Abdomen. Procoxae moderately well separated. Mesocoxae well separated.

Metanepisternal suture distinct, complete. Metaventrite and ventrite 1 with deep depression at middle. Ventrites 1-5 distinct, well separated, ventrite 1 moderately longer than ventrite 2, ventrites 3 and 4 subequal in length, slightly shorter than 1 or 2, ventrite 5 subequal to 3 and 4 combined, suture separating ventrites 1 and 2 incurved at middle, other sutures straight, ventrite 5 subtruncate at apex.

Distribution. Mindanao Island, Philippines (Mount Candalaga, Maragusan, Davao de Oro)

Etymology. The genus name combines the words “Filipino” referring to the people living in the Philippines and “rhynchus” in reference to its close relationship to the genus Pachyrhynchus .

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 2. A–K. Diagnostic characteristics of Filipinorhynchus. (F. engkanto, male). A—rostrum in dorsal view, B—ditto/ prementum, in ventral view; C—ditto/antennal scrobe, lateral view; D—meta-femora and tibia, clump of setae; E—mesofemora and tibia; F—pro-femora/tibia, serrations on internal margin; G—tarsus & claw; H—apex of elytra (female); I—apex of elytra (female), in lateral view; J—right antenna, in dorsal view; K—ventral view. Scale: 2 mm for A–F.