Pachyrhynchus miltoni, Cabras & Rukmane, 2016

Cabras, Analyn Anzano & Rukmane, Anita, 2016, A New Species Of Pachyrhynchus Germar, 1824 (Coleoptera: Curculionidae: Entiminae), Acta Biologica Universitatis Daugavpiliensis 16 (1), pp. 123-127 : 124-126

Pachyrhynchus miltoni sp.n.

( Fig. 1 , 4, 5 )

Type Material. Holotype, male: Marilog District , Davao City, Philippines. 08.19.16. local collector leg. Deposited in CMUZM.(…).

Paratype, male: Marilog District, Davao City ,

Philippines. 09.29.16.Cabras leg. Deposited in CMUZM.(…).

Distribution: Mindanao Island, Philippines.

Description. Measurements: LB: 11.1 LE: 7.1; WE: 6.5; LP: 4.0; WP: 4.0; LR: 1.9; WR: 1.6.

Body coppery brown close to black; pronotum, head and legs coppery brown with weak luster and tinge of metallic red glow; body surface matte with weak luster and with wide spots of pale yellow and light green scales. Eyes, antennae and tarsomeres black. Head with following scales: 1) oblique and elongated stripe under eye on each lateral side of rostrum, 2) elongated median stripe between eyes.

Head with deep groove-shaped impression between eyes and with coarse punctures. Eyes relatively large. Rostrum slightly longer than wide with pale yellow sparse setae laterally from genae to apical part of rostrum with few sparse setae. Dorso- apical part of rostrum flattened. Antennal scape short and stout, strongly clavate; remaining antennomeres small, with sparse pale short pubescence and long setae; apical antennomeres club-shaped, subellipsoidal covered with yellow setae. Funicular segment I longer than wide, slightly longer than II; segments III - VII slightly wider than long; club subellipsoidal, nearly 1.5 times as long as wide, nearly as long as antennal segments V to VII combined.

Pronotum subglobular, widest at middle, with equal length and width, weakly convex and almost flattened dorsally, mostly glabrous, without pubescence and punctures. Pronotum with following spots of pale yellow: 1) median longitudinal band widened medially, extending from basalto apical margin, 2) thick bands on lateral sides of pronotum almost entirely covering lateral sides; with few sparse weak punctures dorsally. Apical part of tinner sides of femori with irregular yellow scaly spots.

Elytra short, ovate, with regular intervals, weakly striate-punctate and strongly convex, with only few sparse short apical pubescence; Each elytron

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with three bands: 1) broad band on basal part of each elytron transversely extending from interval II to lateral margin; 2) broad transverse band in middle part of elytra constricted medially, hourglass-shaped; 3) apical triangular marking, with pointed ends, extending from apex of each elytron to apical third of elytra and laterally connected with median marking by lateral stripe. Scutellum medium sized, rounded apically.

Underside weakly lustrous coveredwith metallic red and sparse pale yellow scales.

Legs wide, with strongly clavate femori and irregular punctures. Tibiae serrate along internal margins. Middle and hind femori covered with short hairs and sparse scales along posterior margins. Each tibia fringed with pubescent along internal margin, sparsely mixed with short hairs. Tarsomeres covered by sparse pubescence.

Aedeagus relatively short but not stout, curved in lateral view ( Fig. 1C );lamella subtriangular, pointed apically ( Fig. 1D )

Differential diagnosis. Pachyrhynchus miltoni sp. n. is similar in general appearance to P. speciosus samarensis Schultze, 1923 and P. kraslavae Rukmane & Barsevskis, 2016 which were described from Samar and Mindanao islands respectively. The new species differs from P. speciosus samarensis (Samar Island) by: 1) shape of more curved aedeagus ( Fig. 2C, D ); 2) shorter length of elytra; 3) the hourglass shaped median marking; 4) deeper longitudinal groove on rostum. Pachyrhynchus miltoni sp. n. clearly differs from P. kraslavae byshapes of the markings of the pronotum; P. miltoni sp. n. has longitudinal band, P. kraslavae has transverse band. The shape of aedegus between the two species are clearly different also ( Fig. 3C, D).

Etymology: This species is named after Professor Milton Norman Medina, the director of Biodiversity and Qualitative Research of the University of Mindanao for his contribution in the study and conservation of Philippine biodiversity.

He is a respected colleague and mentor who submitted the material described herein.

Ecology. Specimens of P. miltoni sp.n. were found in the elevation of 1234 m a.s.l. in Barangay. Baganihan, Marilog District, Davao City (7⁰ 28⁰3 N, 125⁰ 15⁰2 E). The beetles were found crawling on the shrubs of Piper aduncum which was very abundant along the road going to the forested area of Barangay. Baganihan ( Fig.4). But whether specimens feeds on the Piper aduncum , it is not certain since they were not found feeding on its leaves and there are adjacent plants which may also be the food plant of this species. As mentioned by Schultze (1923) Pachyrhynchus prefers open areas along mountain ridges or mixed forests with dense undergrowth along rivers.A lush secondary forest is still present within the area. However, slash and burn farming is currently done on the area by the local villagers to be planted with certain crops such as Theobroma cacao . This can be considered a threat to this species type locality as few meters from the habitat of P.miltoni sp.n. slash and burn farming is on-going ( Fig.5 ).

Figures

Fig. 1. Pachyrhynchus miltoni sp.n. (holotype): A - dorsal view, B - lateral view, C – aedeagus (lateral view), D - aedeagus (dorsal view).

Fig.5. Slash and burn farming near the habitat of P. miltoni sp.n.

Fig. 2. Pachyrhynchus speciosus samarensis Schultze 1923: A - dorsal view, B - lateral view, C – aedeagus (lateral view), D - aedeagus (dorsal view).