Pachyrhynchus barsevskisi Rukmane 2016, sp. n.
Creators: name: Rukmane, Anita
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Pachyrhynchus
Pachyrhynchus barsevskisi

description: Pachyrhynchus barsevskisi sp. n.
(Fig. 2A, E-3A, C, D)
Type material. Holotype, male: ‘’ Philippines, North Luzon Isl., Aurora, Dingalan, VIII. 2013, local collector leg. (typed on a white card); [ex. Prof. A. Barševskis coll.] (typed on a white card); ‘’HOLOTYPE / Pachyrhynchus barsevskisi / Rukmane 2016 / Det. Rukmane 2016 (typed on a red card). (DUBC).
Paratypes (6 pcs.): Philippines, North Luzon, Aurora, Dingalan, 1 male., VIII. 2013, local collector leg.; 1 male., III. 2014, local collector leg.; 1 female., VI. 2015, local collector leg.; East Luzon, Sierra Madre, Disimongal, Madela: 1 male., IX. 2015, local collector leg.; North Luzon, Sierra Madre, Quirino: 1 male., V. 2015, local collector leg.; 1 female., V. 2015, local collector leg. [ex. Prof. A. Barševskis coll.] (DUBC). All paratypes with additional red rectangular printed label: ‘’ PARATYPE / Pachyrhynchus barsevskisi / Rukmane 2016 / det. Rukmane 2016 ’’.
Distribution: Philippines, Luzon Island
Description. Measurements (n=5; 3 males, 2 females): LB: 16.7 (mean 17.32); LE: 9.0 (mean 9.28); WE: 6.2 (mean 6.48); LP: 4.6 (mean 4.8); WP: 4.6 (mean 4.64); LR: 2.2 (mean 2.46); WR: 1.9 (mean 2.1).
Habitus dorsally as in Fig 2A, laterally as in Fig 2E.
Body and legs metallic black; body surface glossy, with spots and stripes of blue and orange scales, four paratypes with green and orange to yellow scales. Eyes, antennae and tarsomeres black. Head massive, glossy, under eyes laterally with pale orange scales. Each lateral side of rostum close to mouth with orange elongate hair-like scales, apical curve with fine orange punctation. Basal margin of pronotum with two ovate scaly spots on each lateral side, apical margin with two triangular markings, connected in middle of apical margin, four paratypes with two elongate scale spots on each side of median part of pronotum. Each latero-basal portion of pronotum with wide orange scaly ovate spot. Apical part of femori with irregular orange and blue scaly spots. Elytra with several scaly spots and two oval spots in middle of median part; basal and apical margins of each elytron with four elongate lines of orange to yellow scales and with blue scales at median part of these lines; apices of first and second line connected, apex of first stripe rounded; median apical margin of elytra with two elongate orange scaly spots.
Rostrum with deep triangular median impression, with orange sparse apical setae, dorsal part with median groove. Lower edge of rostrum extended, clearly visible. Antennal scape long and thin; remaining antennomeres small, with sparse very short pubescense and long setae; apical antenomeres subellipsoidal. Pronotum subspherical, widest in median part gradually narrowing apicad, with very fine and sparse punctation.
Elytra elongated, gradually narrowing from median part apicad, with fine punctures and pubescence; intervals of elytra smooth, with coarse punctures between impressed rows.
Legs wide, with strongly clavate femori. Tibiae serrate along internal margins, strongly incurved apically. Middle and hind femori thinly covered with short setae and hair-like scales along posterior margins. Tibiae with sparse pubescense and long setae; each tibia fringed with long setae along internal margin, sparsely mingled with stout hairs. Tarsomeres covered by sparse pale pubescence.
Aedeagus elongated, curved in lateral view. Lamella ovate, rounded apically (Fig. 3C, D).
Differential diagnosis. Pachyrhynchus barsevskisi sp. n. is similar in general appearance to P. dohrni Behrens, 1887 (Fig. 2B, D), which was described from Luzon Island. The new species is easily distinguishable from P. dohrni by unique scally markings on pronotum: basal margin of pronotum (see dorsally) of P. barsevskisi sp. n. with two ovate scaly spots on each lateral side, apical margin with two triangular markings, connected in the middle of apical margin, and with ovate spot of orange scales on lateral sides of pronotum, lower edge of rostum of P. barsevskisi sp. n. well defined (Fig 3 A, B), different shape impression on median part of rostrum, which is triangular shape, as well as different shape of aedeagus, which is bigger (Fig. 3E, F).
Mimicry. Pachyrhynchus barsevskisi sp. n. is mimyced by longhorn beetle Doliops helleri Vives, 2009 with which it co-exists (Fig. 2C).
Etymology. The species named after Prof. Dr. Arvīds Barševsis (Daugavpils, Latvia) in appreciation of contribution in the study of the genus Pachyrhynchus, cooperation, and usefull advices.
description: Published as part of Rukmane, Anita, 2016, Six New Species Of The Genus Pachyrhynchus Germar, 1824 (Coleoptera: Curculionidae) From The Philippines, pp. 77-89 in Acta Biologica Universitatis Daugavpiliensis 16 (1) on pages 80-82, DOI: 10.5281/zenodo.10979771